What Makes Hauts de Seine UFO Reports Interesting?

Introduction

That pattern matters because Hauts-de-Seine is a dense western inner-suburban department beside Paris, not a remote countryside setting. INSEE records a 2023 population of 1,654,712 and a density of 9,422.7 people per square kilometre, while the local state services describe the department’s 176 square kilometres as operating in a largely urban way.[Insee]insee.frOpen source on insee.fr. In such a place, a truly spectacular object should often have many witnesses, yet several official cases have only one. The department therefore works best as a case study in how urban UFO reports are filtered by witness position, short viewing time, aviation context, weather, video quality, and the discipline of later investigation. Overview image for What Makes Hauts de Seine UFO Reports...

What the official record shows

France has an unusually public official system for UFO-style reports. GEIPAN, the French UAP research and information group within CNES, says it collects, analyses and archives reports of unidentified aerospace phenomena and informs the public about them. CNES traces the official French programme back to 1977, with GEIPAN replacing earlier bodies in 2005.[CNES]cnes.frGEIPAN | CNESGEIPAN | CNES

GEIPAN’s classification system is essential for reading Hauts-de-Seine cases without exaggerating them. Category A means the phenomenon is identified after investigation; B means probably identified; C means not identified because the information is insufficient; and D means not identified after investigation. GEIPAN also states that human testimony is central to its process, but that witnesses are expected to complete a technical questionnaire and that photos, videos and other records can support the account.[cnes-geipan.fr]cnes-geipan.frMethodology | GEIPANMethodology | GEIPAN

Nationally, GEIPAN’s dynamic statistics show why “unidentified” does not mean “extraordinary”. As of 25 June 2026, its published classified cases were divided into 28.0% category A, 38.8% category B, 30.1% category C, and only 3.1% category D, the class for phenomena still unidentified after investigation.[cnes-geipan.fr]cnes-geipan.frStatistics | GEIPANStatistics | GEIPAN Hauts-de-Seine follows that broader pattern: many reports are explained or probably explained, a few are under-documented, and one older case remains genuinely unresolved in the official file.

The Vaucresson case is the department’s standout mystery

The most important Hauts-de-Seine case in the GEIPAN record is Vaucresson on 1 January 1981. According to GEIPAN’s summary, two police officers saw a yellow-orange luminous phenomenon at about 21:40. It was estimated at 100 to 150 metres in the sky, then appeared as a circular craft rotating on itself, moving slowly and regularly, without noise, seemingly beginning a descent. The object reportedly showed different flashing lights and left a short trail. The observation lasted about a minute and ended when the landscape hid the object. GEIPAN’s summary states that no other information was collected and that the phenomenon remains unexplained.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

The case has several features that make it more durable than many local reports. The witnesses were police officers rather than anonymous casual observers; the description included motion, shape, colour, silence and duration; and GEIPAN classifies the case as D, meaning it was not identified after investigation rather than merely dismissed for lack of interest.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

The doubts are equally important. The reported duration was short, about one minute. There is no indication in the GEIPAN summary of photographs, radar data, physical traces, independent civilian witnesses, or a later corroborating archive. In a dense western suburb of Paris, that absence matters. It does not disprove the witnesses’ account, but it keeps the case in the careful category of “unexplained report” rather than “established extraordinary event”.

The Vaucresson file is therefore best read as a strong local testimony with weak external support. It deserves a central place in Hauts-de-Seine UFO history, but not the status sometimes implied by the word “sighting” when used as if it describes a confirmed object. What Makes Hauts de Seine UFO Reports... illustration 1

Older thin files show the limits of the archive

Another early file, Meudon on 4 July 1980, shows the other side of the historical record. GEIPAN lists the case as category C, with the phenomenon type given as lack of reliable information. The testimony page records an observation at 22:30, a single phenomenon described in the sky, orange or fire-coloured, spherical or ball-like, apparently slow and silent, with a trail or tail.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

That sounds interesting at first glance, but the classification is the point. Category C is not “mysterious after good investigation”; it means the case cannot be identified because the information is inadequate. GEIPAN’s own method distinguishes that from category D, where the case remains unexplained despite investigation.[cnes-geipan.fr]cnes-geipan.frMethodology | GEIPANMethodology | GEIPAN

Hauts-de-Seine has other late-1970s entries that appear in GEIPAN search results as category C, including Rueil-Malmaison on 3 June 1979 and Colombes on 25 July 1979, both listed as lacking reliable information.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr. These cases are useful for historians because they mark reported activity in the department, but they are not strong evidence for an unusual phenomenon. They are better understood as fragments: enough to preserve a report, not enough to resolve it.

The lantern pattern: orange lights over the inner suburbs

One of the clearest recurring explanations in Hauts-de-Seine is the release of sky lanterns. GEIPAN’s Montrouge case from 21 July 2009 involved four red lights moving north to south around 00:40, with no sound, over about two minutes. GEIPAN noted the familiar combination of red-orange lights, silent movement, low apparent altitude, sudden extinction and the wider multiplication of this type of observation, and classified it as a probable lantern case.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

A later Asnières-sur-Seine report on 7 June 2014 is even more typical. A witness saw around twenty orange balls in the night sky at 23:53. GEIPAN judged the event probably to be lanterns released after a celebration, noting that the objects were almost stationary, drifted slightly, faded, and matched wind conditions recorded at Roissy. No other testimony was collected, and the case was classified as category B.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

These cases matter because they show how a small social event can become a UFO report in a city. Lanterns can appear as multiple silent lights, drift with the wind, brighten and fade unevenly, and vanish without an obvious landing point. To an observer without context, especially late at night from a window or street, that can feel more organised and stranger than it is.

The local lesson is not that every orange-light report is automatically a lantern. It is that colour, silence and formation are not enough by themselves. Direction of travel, wind, duration, number of witnesses, photographs, and whether the lights extinguish one by one all become decisive.

Balloons, debris and the problem of urban scale

Several Hauts-de-Seine files show a second common theme: small or ordinary objects become hard to judge against a city sky. In Courbevoie on 27 July 2012, a witness reported a large dark object moving silently at constant speed at 08:23. GEIPAN found that the object’s speed and direction were compatible with the wind, and noted the absence of other reports despite the object supposedly passing over a densely populated area at rush hour. The case was classified as a probable piece of wind-blown debris.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

The 2021 Garches case shows how video can help without making a report more exotic. A witness filmed what seemed at first like a helicopter light: a silent luminous object moving upward, with what might have looked like a cable or rod beneath it. GEIPAN considered the case well documented because the witness gave a complete account and supplied two videos. The investigation concluded that the object was a novelty balloon, probably reflective material, moving with the dominant wind and shining by reflected sunlight.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

Sceaux on 4 June 2023 offers a similar modern example. A witness filmed a dark, round, stable object moving for about a minute from a third-floor apartment window, with apparent “flames”. GEIPAN found that the video and visual landmarks allowed the trajectory to be corrected, that the path was compatible with the wind, and that the flame-like effect could be explained by sunset rays reflecting from a rotating mylar balloon. The object was estimated at about 100 metres from the witness and the case was classified as category A, a very probable mylar balloon.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

These cases are valuable because they resist a simple “video equals proof” assumption. In Garches and Sceaux, video strengthened the investigation, but it strengthened mundane explanations. The more precise the geometry, wind comparison and visual analysis became, the less mysterious the object looked. What Makes Hauts de Seine UFO Reports... illustration 2

Aviation explains some of the most dramatic lights

Hauts-de-Seine sits in a complex aviation environment: close to Paris, near Orly approaches, and not far from the Vélizy-Villacoublay military air base in neighbouring Yvelines. CNES identifies GEIPAN’s partners as including the gendarmerie, police, the French Air and Space Force, CNRS and Météo-France, which matters because many serious reports require aviation and weather checks rather than only witness interviews.[CNES]cnes.frGEIPAN | CNESGEIPAN | CNES

The A86 case from 1 November 2021 is the best local illustration. A motorist near Sceaux, travelling towards Paris, saw two very bright white oval lights side by side, apparently moving slowly. The sighting was brief because the witness entered a tunnel. GEIPAN first tested whether they could be landing lights from two airliners approaching Orly, even identifying Transavia and easyJet candidates, but rejected that fit because the elevation did not match the witness estimate. It then considered military aircraft landing lights and classified the report as a probable observation of two military aircraft.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

The case is especially instructive because GEIPAN did not simply grab the first convenient explanation. It compared a civil-aircraft hypothesis against geometry, found a mismatch, and moved to another aviation hypothesis. It also noted reasons why the report felt strange to the witness: white landing lights, apparent oval shape caused by lights blending at distance, lack of noise inside a car in traffic, and slow apparent movement when aircraft are coming roughly towards the observer rather than crossing the field of view.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

The result is not a debunking by ridicule. It is a practical demonstration of how an observation can be sincere, brief, striking and still probably ordinary.

Why Hauts-de-Seine produces reports without a major flap

Hauts-de-Seine does not appear, from the accessible official record, to have a single large department-wide UFO flap comparable to better-known French waves. Instead, its files are scattered across decades and communes: Vaucresson, Meudon, Montrouge, Courbevoie, Asnières-sur-Seine, Garches, Sceaux and the A86 corridor. That distribution fits the department’s character: compact, highly populated, full of windows, roads, office towers, reflected sunlight, traffic noise, aircraft routes and short urban sightlines.

The department’s density cuts both ways. On one hand, more people means more potential witnesses. On the other, buildings, tunnels, street lighting, weather haze and short viewing angles can make ordinary objects harder to identify. The A86 report ended because the driver entered a tunnel; the Sceaux witness saw the object from an apartment window; the Courbevoie report was assessed partly against the lack of corroboration in a busy urban zone.[cnes-geipan.fr+2cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

La Défense adds another layer to the department’s sky-watching environment. The business district lies in Hauts-de-Seine communes including Courbevoie, Nanterre and Puteaux, and is known for high-rise glass and steel buildings, office space and heavy daily movement.[Wikipedia]WikipediaLa DéfenseLa Défense That does not create UFOs, but it does create a landscape of reflections, partial views, artificial lights and observers who may see the sky only briefly between buildings.<div class="youtube-embed-container youtube-embed-fallback youtube-embed-link-only"><div class="youtube-embed-card"><div class="youtube-embed-link-panel">YouTubehttps://www.youtube.com/watch?v=K—xzkAAI4</div><div class="youtube-embed-footer"><p class="youtube-embed-title">https://www.youtube.com/watch?v=K—xzkAAI4</p><p class="youtube-embed-actions">Open on YouTube</p></div></div></div>

How to judge a Hauts-de-Seine UFO claim

The useful question is not “Was it a UFO?” in the popular sense. It is “What kind of report is this?” The official Hauts-de-Seine files suggest a simple hierarchy for readers.

A category D case deserves attention, but still needs caution. Vaucresson is the strongest local example because the witnesses were police officers and the report remains officially unexplained. Yet the lack of broader corroboration prevents a confident extraordinary conclusion.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

A category C case is historically interesting, not evidentially strong. Meudon and similar late-1970s entries preserve the fact that something was reported, but GEIPAN’s own classification warns that the information is not reliable enough to identify the phenomenon.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

A category B case can still be worth reading. Montrouge, Asnières-sur-Seine, Courbevoie and the A86 report are useful because they show the reasoning process: lantern behaviour, wind-blown debris, aircraft lights, witness location, sound conditions and absence of corroboration.[cnes-geipan.fr+3cnes-geipan.fr+3cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr.

A category A case can be the most educational. Garches and Sceaux show that a video-supported sighting may become more explainable, not less, once trajectory, lighting and wind are checked.[cnes-geipan.fr]cnes-geipan.frOpen source on cnes-geipan.fr. What Makes Hauts de Seine UFO Reports... illustration 3

The balanced takeaway

Hauts-de-Seine’s UFO history is not a story of repeated close encounters or a hidden local wave. It is a compact record of how strange things are reported in a dense urban sky: a still-unexplained police sighting at Vaucresson, older under-documented reports such as Meudon, and a run of modern cases where lanterns, balloons, debris and aircraft explain much of the apparent mystery.

That makes the department more useful than it may first appear. It shows why official classification matters, why “unidentified” is not one single category, and why good investigation often narrows a story rather than enlarging it. The most credible reading is therefore modest but not dismissive: Hauts-de-Seine has one notable unresolved case, several weak historical reports, and many instructive examples of ordinary objects becoming briefly extraordinary in the sky over western Paris.<section class="further-reading-section" data-page-toc-exclude aria-labelledby="further-reading-title"><div class="fr-section-shell"><div class="fr-section-header"><div class="fr-section-heading"><p class="fr-section-kicker">Amazon book picks</p><h3 class="fr-heading" id="further-reading-title">Further Reading</h3></div><p class="fr-intro">Books and field guides related to What Makes Hauts de Seine UFO Reports Interesting?. Use these as the next step if you want deeper reading beyond the article.</p></div><div class="fr-books-grid"><article class="fr-book-card">Book<div class="fr-book-info"><h4 class="fr-book-title">The UFO Experience</h4><p class="fr-book-author">By Joseph Allen Hynek</p><p class="fr-book-desc">Covers classification and assessment methods similar to official case reviews.</p><div class="fr-book-actions"> See on Amazon</div></div></article><article class="fr-book-card">Book<div class="fr-book-info"><h4 class="fr-book-title">UFOs</h4><p class="fr-book-author">By Leslie Kean</p><p class="fr-book-desc">Broad introduction matching a department-wide UFO overview page.</p><div class="fr-book-actions"> See on Amazon</div></div></article><article class="fr-book-card">Book<div class="fr-book-info"><h4 class="fr-book-title">Passport to Magonia</h4><p class="fr-book-author">By Jacques Vallee</p><p class="fr-book-desc">Offers historical perspectives on unusual aerial reports.</p><div class="fr-book-actions"> See on Amazon</div></div></article><article class="fr-book-card">Book<div class="fr-book-info"><h4 class="fr-book-title">The Demon-haunted World</h4><p class="fr-book-author">By Carl Sagan</p><p class="fr-book-desc">Useful for understanding evidence and extraordinary claims.</p><div class="fr-book-actions"> See on Amazon</div></div></article></div><div class="fr-section-footer"><div class="fr-browse-links" aria-label="Browse more on Amazon">Browse more on Amazon:The UFO Experience UFOs Passport to Magonia</div><p class="fr-disclosure">As an Amazon Associate I earn from qualifying purchases.</p></div></div></section><section class="further-reading-section" data-page-toc-exclude data-ebay-localized-links data-ebay-visual-market="EBAY_GB" aria-labelledby="merchant-block-title"><div class="fr-section-shell"><div class="fr-section-header"><div class="fr-section-heading"><p class="fr-section-kicker">eBay marketplace picks</p><h3 class="fr-heading" id="merchant-block-title">Marketplace Samples</h3></div><p class="fr-intro">Live-tested eBay searches with available results related to this page.</p><div class="fr-ebay-market-toolbar">Shop location<div class="fr-ebay-market-picker">UsingUSA<div class="fr-ebay-market-menu" data-ebay-market-menu role="listbox" hidden></div></div></div></div><div class="fr-ebay-market-panel" data-ebay-market-panel="EBAY_GB" data-ebay-market-default="1"><div class="fr-books-grid"><article class="fr-book-card"><div class="fr-book-info"><p class="fr-book-kicker">Example eBay listing</p><h4 class="fr-book-title">Small UFO Flying Saucer Metal & Enamel Pin Badge with Secure Locking Back</h4>SearcheBay.co.uk: UFO collectible pin<div class="fr-book-actions"> Browse similar oneBay.co.uk</div></div></article><article class="fr-book-card"><div class="fr-book-info"><p class="fr-book-kicker">Example eBay listing</p><h4 class="fr-book-title">UFO Flying Saucer Pewter Pin Badge</h4>SearcheBay.co.uk: UFO collectible pin<div class="fr-book-actions"> Browse similar oneBay.co.uk</div></div></article><article class="fr-book-card"><div class="fr-book-info"><p class="fr-book-kicker">Example eBay listing</p><h4 class="fr-book-title">UFO Shado Metal & Enamel Pin Badge Brooch Alien Defence Organisation New</h4>SearcheBay.co.uk: UFO collectible pin<div class="fr-book-actions"> Browse similar oneBay.co.uk</div></div></article><article class="fr-book-card"><div class="fr-book-info"><p class="fr-book-kicker">Example eBay listing</p><h4 class="fr-book-title">UNA UFO OLD RARE Football Badge Badge Badge Odznaka Pins</h4>SearcheBay.co.uk: UFO collectible pin<div class="fr-book-actions"> Browse similar oneBay.co.uk</div></div></article></div><div class="fr-section-footer"> Browse more oneBay.co.uk<p class="fr-disclosure">Example items shown for inspiration; availability and pricing can change. Branchoria may earn a commission if you purchase through outbound eBay links.</p></div></div></div></section>

Endnotes

1. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/cas/1981-01-00847

2. Source: cnes-geipan.fr
Title: Methodology | GEIPAN
Link:https://www.cnes-geipan.fr/en/node/58788

3. Source: insee.fr
Link:https://www.insee.fr/fr/statistiques/1405599?geo=DEP-92+FE-1

4. Source: cnes.fr
Title: GEIPAN | CNES
Link:https://cnes.fr/en/projects/geipan

5. Source: cnes-geipan.fr
Title: Statistics | GEIPAN
Link:https://www.cnes-geipan.fr/en/stats

6. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas?field_agregation_index_value=Ain&field_is_new_value=All&field_is_revisited_value=All&field_type_de_cas_target_id=All&order=field_date_d_observation&page=%2C197&sort=desc

7. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/en/node/48599

8. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?customGetLattitude=46.94358292648825&customGetLongitude=4.4989013671875&customGetZoom=7&field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=49.11702904077932&field_latitude_value%5Bmin%5D=44.77013681219717&field_longitude_value%5Bmax%5D=7.668457031250001&field_longitude_value%5Bmin%5D=1.329345703125&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_classification_des_cas&page=44%2C0&sort=asc

9. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/cas/2009-07-02349

10. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/cas/2014-06-08712

11. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/cas/2012-07-08273

12. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/cas/2021-10-51270

13. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/cas/2023-06-51444

14. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/cas/2021-11-51263

15. Source: Wikipedia
Title: La Défense
Link:https://en.wikipedia.org/wiki/La_D%C3%A9fense

16. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=&field_classification_des_cas_target_id%5B12%5D=12&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_departement_textuel&page=27%2C4&sort=asc

17. Source: cnes-geipan.fr
Title: Elements enquete IPN R
Link:https://www.cnes-geipan.fr/sites/default/files/Elements%20enquete%20IPN-R.pdf

18. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/en/recherche/cas/tab?customGetLattitude=48.86996345993287&customGetLongitude=2.399826049804688&customGetZoom=11&field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=49.00094298321503&field_latitude_value%5Bmin%5D=48.738983936650705&field_longitude_value%5Bmax%5D=2.633285522460938&field_longitude_value%5Bmin%5D=2.166366577148438&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date&page=3%2C4&sort=asc

19. Source: cnes-geipan.fr
Title: Questionnaire terre R29
Link:https://www.cnes-geipan.fr/sites/default/files/Questionnaire%20terre-R29.pdf

20. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/en/search/cas?field_classification_des_cas_target_id%5B13%5D=13&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_type_de_cas_target_id=All&order=title&page=%2C127&sort=desc

21. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/sites/default/files/Compte%20rendu%20enquete94.pdf

22. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas?field_agregation_index_value=Ain&field_is_new_value=All&field_is_revisited_value=All&field_type_de_cas_target_id=All&order=title&page=%2C38&sort=asc

23. Source: cnes-geipan.fr
Title: Compte rendu enquete339
Link:https://www.cnes-geipan.fr/sites/default/files/Compte%20rendu%20enquete339.pdf

24. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?customGetLattitude=46.94358292648825&customGetLongitude=4.4989013671875&customGetZoom=7&field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=49.11702904077932&field_latitude_value%5Bmin%5D=44.77013681219717&field_longitude_value%5Bmax%5D=7.668457031250001&field_longitude_value%5Bmin%5D=1.329345703125&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_departement_textuel&page=38&sort=desc

25. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/sites/default/files/save_json_import_files/export_cas_pub_20251127093552.csv

26. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=&field_classification_des_cas_target_id%5B11%5D=11&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=1&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date_d_observation_textuel&page=24&select-category-export=nothing&sort=desc&video=on

27. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/sites/default/files/Questionnaire%20terre-R115.pdf

28. Source: cnes-geipan.fr
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29. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/sites/default/files/Etude_psycho_1981_2.pdf

30. Source: cnes-geipan.fr
Title: Courriers R2
Link:https://www.cnes-geipan.fr/sites/default/files/Courriers-R2.pdf

31. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas?field_agregation_index_value=&field_classification_des_cas_target_id%5B0%5D=12&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_departement_textuel&page=%2C49&sort=asc

32. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/en/search/cas?field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=116&order=title&page=%2C466&select-category-export=nothing&sort=asc

33. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas?customGetLattitude=46.94358292648825&customGetLongitude=4.4989013671875&customGetZoom=7&field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=49.11702904077932&field_latitude_value%5Bmin%5D=44.77013681219717&field_longitude_value%5Bmax%5D=7.668457031250001&field_longitude_value%5Bmin%5D=1.329345703125&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date_d_observation&page=%2C167&sort=asc

34. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/cas/2022-11-51409

35. Source: cnes-geipan.fr
Title: evolution classification des cas
Link:https://www.cnes-geipan.fr/fr/actualites/evolution-classification-des-cas

36. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/en/missions-methodes-et-resultats

37. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/glossaire

38. Source: cnes-geipan.fr
Title: methodologie classification geipan
Link:https://www.cnes-geipan.fr/fr/actualites/methodologie-classification-geipan

39. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/en/node/412

40. Source: cnes-geipan.fr
Title: baisse cas d
Link:https://www.cnes-geipan.fr/fr/actualites/baisse-cas-d

41. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/cas/1994-12-09759?field_is_revisited_value=1&page=%2C10

42. Source: cnes-geipan.fr
Title: deux nouveaux cas d1
Link:https://www.cnes-geipan.fr/fr/actualites/deux-nouveaux-cas-d1

43. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/cas/1979-07-00644

44. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/en/what-did-i-see/step-1

45. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/cas/1978-07-00528

46. Source: cnes-geipan.fr
Title: 2015 09 01 Spatial Point Pattern Analysis of the Unidentified
Link:https://www.cnes-geipan.fr/sites/default/files/2015-09-01_Spatial_Point_Pattern_Analysis_of_the_Unidentified.pdf

47. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas?field_is_new_value=All&field_is_revisited_value=All&field_type_de_cas_target_id=All&order=field_date_d_observation&page=%2C201&sort=desc

48. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/node/59758

49. Source: Wikipedia
Link:https://en.wikipedia.org/wiki/GEIPAN

50. Source: Wikipedia
Title: Unidentified flying object
Link:https://en.wikipedia.org/wiki/Unidentified_flying_object

51. Source: Wikipedia
Title: Hauts de Seine
Link:https://en.wikipedia.org/wiki/Hauts-de-Seine

52. Source: Wikipedia
Title: Vélizy Villacoublay Air Base
Link:https://en.wikipedia.org/wiki/V%C3%A9lizy-Villacoublay_Air_Base

53. Source: Wikipedia
Title: Hauts de Seine
Link:https://fr.wikipedia.org/wiki/Hauts-de-Seine

54. Source: insee.fr
Title: Population estimates
Link:https://www.insee.fr/langue/en?url=%2Fen%2Fstatistiques%2Fserie%2F001760172

55. Source: insee.fr
Title: Dossier complet − Département des Hauts-de-Seine (92)Hauts-de-Seine (92)
Link:https://www.insee.fr/fr/statistiques/2011101?geo=DEP-92

56. Source: insee.fr
Link:https://www.insee.fr/fr/statistiques/1405599?geo=UU2020-00851+DEP-75+DEP-92+DEP-93+DEP-94

57. Source: insee.fr
Title: Comparateur de territoires Paris (75)
Link:https://www.insee.fr/fr/statistiques/1405599?geo=DEP-75+DEP-93+DEP-92+DEP-94

58. Source: insee.fr
Title: Population estimates
Link:https://www.insee.fr/en/statistiques/serie/001740663

59. Source: insee.fr
Link:https://www.insee.fr/fr/statistiques/fichier/8680694/dep92.pdf

60. Source: insee.fr
Link:https://insee.fr/fr/statistiques/zones/1405599

61. Source: insee.fr
Link:https://www.insee.fr/fr/metadonnees/geographie/departement/92-hauts-de-seine

62. Source: geipan.fr
Link:https://geipan.fr/fr/recherche/cas/tab?field_classification_des_cas_target_id%5B13%5D=13&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_type_de_cas_target_id=All&order=field_date_d_observation&page=12&sort=asc

63. Source: geipan.fr
Link:https://www.geipan.fr/fr/recherche/cas/tab?customGetLattitude=46.124763699209396&customGetLongitude=2.406005859375001&customGetZoom=6&field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=50.52739681329302&field_latitude_value%5Bmin%5D=41.72213058512578&field_longitude_value%5Bmax%5D=8.745117187500002&field_longitude_value%5Bmin%5D=-3.9331054687500004&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date_d_observation&page=134&sort=desc&undefined=

64. Source: geipan.fr
Link:https://www.geipan.fr/en/recherche/cas/tab?field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_type_de_cas_target_id=All&order=field_classification_des_cas&page=23&sort=desc

65. Source: applis.hauts-de-seine.fr
Link:https://applis.hauts-de-seine.fr/v3fichiers/HDS%20PLUS/HDSplus27.pdf

66. Source: archive.org
Title: UFOmania No 55 djvu.txt
Link:https://archive.org/stream/UFOmania_No_55/UFOmania_No_55_djvu.txt

67. Source: en.wikivoyage.org
Title: La Défense
Link:https://en.wikivoyage.org/wiki/Paris/La_D%C3%A9fense