CORROBORATED
CF-GEI-20130208396 CORROBORATED
The Pirmil Contrail Illusion
CASE FILE — CF-GEI-20130208396 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
2013-02-02
Location Reported location of the sighting or event
Pirmil, Sarthe, France
Duration Estimated duration of the observed phenomenon
Several minutes
Object Type Classification of the observed object based on witness descriptions
light
Source Origin database or archive this case was sourced from
geipan
Witnesses Number of known witnesses who reported the event
2
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
On February 2, 2013, multiple witnesses in Pirmil, Sarthe (département 72) observed several stationary traces in the cloudy sky that disappeared one after another. A child photographed the phenomenon with a mobile phone. The witnesses submitted testimony through a questionnaire, and the Gendarmerie filed an official police report documenting the observation.
GEIPAN's technical analysis of the mobile phone photograph, taken at 1/125th second shutter speed, revealed clear aircraft condensation trails. The atmospheric conditions at the time created an unusual visual effect: dry northerly winds (65% humidity according to Météociel data) caused the contrails to remain short. Most significantly, the timing near sunset (18:01 in Le Mans) meant the high-altitude contrails remained illuminated by direct sunlight while the lower sky darkened, creating exceptionally high contrast that made the trails appear flame-like.
As Earth's shadow rose and reached the altitude of the contrails, they ceased being illuminated and became invisible against the darkening sky, explaining why they "disappeared one after another." The phenomenon was thoroughly documented with photographic evidence, meteorological data, and witness testimony collected by both GEIPAN and local police authorities.
02 Timeline of Events
~18:00
Initial Observation
Multiple witnesses in Pirmil observe several stationary traces in the cloudy sky near sunset (sunset officially at 18:01 in Le Mans)
~18:01
Photographic Documentation
Child witness photographs the phenomenon with mobile phone at 1/125s shutter speed, capturing clear images of the traces
~18:02-18:05
Sequential Disappearance
Traces disappear one after another as Earth's shadow rises and the contrails lose direct sunlight illumination
Post-incident
Official Documentation
Witnesses complete GEIPAN questionnaire; Gendarmerie files official police report (procès verbal)
Investigation
GEIPAN Analysis
Technical analysis of photograph and cross-reference with meteorological data (Météociel) confirms contrails under specific atmospheric conditions
Classification
Case Closed - Class A
GEIPAN classifies case as 'A' (explained with certainty) - aircraft condensation trails
03 Key Witnesses
Anonymous Witness 1
Civilian observer
medium
Primary adult witness who observed the phenomenon and submitted testimony via GEIPAN questionnaire and Gendarmerie report
Anonymous Witness 2
Child photographer
medium
Young witness who documented the sighting with mobile phone photography, providing crucial photographic evidence at 1/125s shutter speed
04 Analyst Notes -- AI Processed
This case exemplifies how atmospheric optics and lighting conditions can transform mundane aerial phenomena into seemingly anomalous sightings. The GEIPAN investigation was thorough and methodical, incorporating photographic analysis, meteorological data verification (humidity levels, wind direction), and astronomical timing (precise sunset calculation). The 1/125s shutter speed photograph provided conclusive evidence of contrail structure.
The credibility of this case is enhanced by multi-witness observation, immediate photographic documentation, and official police involvement through the Gendarmerie. The classification as "A" (explained with certainty) by GEIPAN reflects the conclusive nature of the evidence. The witnesses' perception of stationary objects is consistent with contrails viewed at oblique angles, where lateral motion is imperceptible. The sequential disappearance pattern perfectly matches the progression of Earth's shadow rising through the atmosphere at sunset.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Misidentified Common Aviation Activity
This case represents a textbook example of how ordinary aviation activity can appear anomalous under specific conditions. The witnesses' description of 'stationary traces' and flame-like appearance, while subjectively accurate, simply reflects unfamiliarity with how contrails appear during twilight hours. The photographic evidence and meteorological correlation remove any ambiguity. No alternative explanation is warranted or scientifically supportable.
06 Verdict
ANALYST VERDICT
This case is definitively explained as aircraft condensation trails observed under exceptional lighting conditions. The combination of sunset timing, dry atmospheric conditions, and the contrast between illuminated high-altitude trails and darkening sky created a dramatic visual effect that appeared anomalous to ground observers. The photographic evidence, meteorological correlation, and optical analysis leave no ambiguity. This case demonstrates the importance of considering atmospheric optics and time-of-day effects when evaluating aerial phenomena reports. While visually striking to witnesses, particularly the flame-like appearance, the phenomenon was entirely conventional and is used by GEIPAN as an educational example of explained aerial observations.
AI CONFIDENCE SCORE:
85%
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