The lights seen around the Baltic coast on 24 August 1990 became known as the Greifswald UFO case. Several surviving accounts describe bright groups that seemed to hang in the sky, fade and reappear elsewhere. Later investigators argued that military illumination targets explained the display. The most useful way to assess that argument is to separate what individual witnesses reported, what official correspondence actually confirmed and what later researchers inferred about the equipment and operating forces.
The map uses an approximate Greifswalder Bodden reference, rounded to 54.22°N, 13.55°E from the checked bay coordinates. It represents the broad coastal setting. It is not a plotted position of the lights or a reconstruction of a particular observer’s boat or home. The photograph shows the bay in January 2012, under different conditions from the reported summer evening.
An early headline and a later witness letter
A BILD clipping dated 1 September 1990, preserved in CENAP’s public case dossier, announces that atomic physicists had filmed UFOs. It describes bright formations over the Baltic coast and quotes Johannes von Buttlar interpreting the material as evidence of extraterrestrials. That is evidence of how the story was being promoted, not a scientific conclusion established by the witnesses’ profession. The newspaper’s photograph and headline do not identify the physical cause of the lights.
A more measured description appears in Gero S.’s letter dated 3 August 1993, reproduced as a scan in Dennis Kirstein’s report. Gero says he and his wife noticed the lights near Poseritz on Rügen at about 9 p.m. on 24 August 1990. He describes a cluster fading after three to five minutes, then another appearance as they resumed their journey. A later stop allowed roughly ten more minutes of observation.
Gero expressly qualifies an impression that the grouping rotated: he could not clearly establish it. He also discusses compass bearings taken afterwards, which did not agree well enough to fix a unique position. His own proposed explanation involved slowly moving luminous objects igniting and burning out. These qualifications are part of the witness document. Removing them would turn a cautious account into a stronger assertion of a solid rotating object than he actually made. The letter is dated three years after the event, though he refers to notes made in September 1990.
A sailor’s interpretation
An original CENAP questionnaire reproduced on page 16 records another observer, identified here as Dr S., sailing on the bay with his wife. He describes several white lights and smaller flashes. He understood them as familiar illumination targets associated with military firing, rather than an unfamiliar craft. His account puts the display at around twenty minutes and describes the lights extinguishing in approximately the reverse order of their appearance.
The questionnaire is valuable because it preserves an ordinary explanation offered by a witness. It also contains claims about how the targets were launched and the type of missiles involved. Those details are his interpretation of the display, not automatically verified operational information. Recognising the general appearance of military illumination is a different claim from identifying the exact weapons, launch platform or unit responsible on a particular night.
Two official letters from 1994
The Bundesamt für Wehrtechnik und Beschaffung letter of 14 November 1994 responds to Werner Walter’s enquiry about the Baltic lights on 24 August 1990. The office says its research found that corresponding tests had taken place that day and that it could confirm the observations and associated explanations. It immediately adds that it has no further information. The wording supports a connection with tests; it does not identify an aircraft, a bomb model, an operating nation or a precise launch location.
A Swedish defence attaché’s letter dated 8 November 1994 excludes Swedish armed forces and mentions information about air-force exercises, probably Russian, east of Rügen. It suggests that the lights might have been infrared target flares and says the reported direction fits reasonably well. The letter also relays a different possible explanation from the armed forces’ research establishment, involving a rocket stage entering the atmosphere. Its wording expresses possibilities and limited information, rather than certifying one fully reconstructed operation.
The later military explanation
In the August 2014 version of his report, Kirstein argues for SAB-type illumination devices releasing seven parachute-supported flares. He compares their appearance and gradual extinguishing with the recorded formations, and explains why slow descent at a considerable distance could look almost stationary. He also distinguishes successive groups from a single set of lights supposedly lasting throughout a long observation. This is the investigator’s reconstruction; the numerical specifications are not measurements made from the coast in 1990.
Kirstein concludes that the case is explained and attributes the likely operation to the Czechoslovak air force. The distinction between stimulus and operator is important. Evidence consistent with illumination targets can be stronger than evidence identifying exactly who deployed them. The two 1994 letters do not by themselves establish that later national attribution, and a comparison with another exercise is not an operational log of the Greifswald event.
The report also reproduces later correspondence and recollections from 2012. A Czech defence attaché is quoted saying that relevant archival material had been destroyed and that information confirming participation was unavailable. A former controller recalls checking that a firing area was active, but is uncertain whether 24 August was the correct date and places his recollection at about 10 p.m. These are useful leads with explicit limitations, not interchangeable with an accurately timed contemporary record.
What can be concluded
The surviving documents make a substantial military explanation possible without treating every detail as settled. A witness independently describing illumination targets, an official confirmation of relevant tests and the behaviour described in other accounts are significant evidence. At the same time, dates of recollection, uncertain bearings and incomplete operational details constrain how far that evidence can be taken. A witness’s conclusion about surface-launched targets, a later reconstruction involving aircraft and an attaché’s tentative national attribution should not be fused into one supposedly unanimous account.
Greifswald therefore belongs in the archive as a reported light display with a well-developed conventional explanation. The material reviewed here does not require extraterrestrial craft to account for it, and no such identity is established. It also does not supply a complete contemporary operations record fixing every platform and participant. Keeping the early reports, original letters and later reconstruction distinguishable gives a clearer picture than either a headline declaring alien visitors or a claim that every historical detail has been proved.