UFO Waves History: From the 1948 Periodicity Memo to Today's Monthly UAP Paperwork
In a November 1948 intelligence summary, United States Air Force officials noted the recurring nature of the reports with concern, stating that flying saucer sightings "periodically continue to cop up" (45b2fdb6c919cd8e). Today, as revealed by recent Department of Defense disclosures, that unpredictable periodicity has vanished from the archival record, replaced entirely by a continuous, standardized stream of military UAP paperwork.
1948: Detecting Periodicity and the Imminent Alert
The concept of the "UFO wave" or "flap"—a sudden, localized spike in sightings—defined the early decades of the phenomenon. In the late 1940s, military intelligence actively monitored these waves. A Top Secret November 1948 USAF Directorate of Intelligence file reveals the depth of this concern. The memo states that officials were convinced the objects could not be disregarded and had to be explained on a basis "perhaps slightly beyond the scope of our present intelligence thinking" (45b2fdb6c919cd8e).
The same document highlights how international intelligence agencies were similarly bracing for waves. The USAF memo notes that the Swedish Air Intelligence Service had concluded the phenomena were the result of high technical skill and had even dispatched a naval salvage team to investigate a previously uncharted crater on a lake floor, believed to be caused by a crashed flying saucer (45b2fdb6c919cd8e). This high-alert posture created an environment where military personnel were actively primed to look for and report anomalies, effectively guaranteeing that a wave would materialize.
The Prediction Fulfilling in Real Time
The archival files from late 1948 demonstrate how this heightened state of attention resulted in a dense cluster of reports across the globe, fulfilling the military's expectation of continued sightings. In October and November of that year, sighting reports flooded into intelligence channels from multiple theaters.
On October 11, 1948, six military personnel at Neubiberg Air Base in Germany observed a silver, round object at an estimated 40,000 feet. The object remained stationary for 45 minutes before disappearing behind a thin layer of clouds (1d9722f764878359). Just four days later, on October 15, an F-61 interceptor in the Fukuoka area of Japan tracked an unidentified aircraft on airborne radar. The interceptor closed to within 12,000 feet before the object suddenly accelerated and disappeared from the scope, demonstrating a "high rate of acceleration" and the ability to evade radar limits (1d9722f764878359).
The wave extended to North America. On October 20, observers in Winona, Minnesota, reported a slow-moving object that "broke up into numerous bright particles" (1d9722f764878359). By October 29, radar operators at Goose Bay, Labrador, tracked an unknown object making an approach at 25 to 30 miles per hour before disappearing (1d9722f764878359).
Domestic law enforcement was also swept up in the flap. FBI files from the period document a September 1947 incident where Portland Police Chief Leon V. Jenkins and other officers observed a "round silver object" at 10,000 feet that changed to an egg-shaped profile as it maneuvered (1ddb6ef944239c55). In the context of 1948, these disparate events were compiled into incident summary sheets, reinforcing the perception of a coordinated, periodic wave of unknown craft.
2020–2026: The Continuous Flow of Standardized Forms
When we contrast the frantic telexes of 1948 with the UAP documents of the 2020s, the concept of the "wave" completely disappears. In its place is a continuous, bureaucratic flow of standardized data.
A 2020 USAF Mission Report (MISREP) from the Arabian Gulf perfectly illustrates this shift. There is no narrative of panic or speculation about origins. Instead, the sighting is logged in a highly structured database format with fields for "Tasking Order," "Aircraft Callsign," and "UAP Event Type." The narrative section simply and clinically notes that "4X UAP OBSERVED FLYING" at approximately 1736Z, and that cloud coverage obstructed the sensor's field of view (58219b8000454aa2).
By 2025, the reporting mechanism had become so routine that the primary concern of intelligence officers was administrative classification. Internal DoD emails from April 2025 show an Information Disclosure Analyst negotiating the classification level of sighting summaries in the INDOPACOM area of responsibility. The analyst confirms that specific "tearline" reports—such as "US AIRCRAFT OBSERVED 1X POSS UAP FOR 12 SECONDS AT 2353Z, FLYING AT UNK ALTITUDE AND UNK SPEED"—are approved for release at the UNCLASSIFIED level (10c11e9bf4d66861).
This normalization culminates in a 2026 video submission to the All-domain Anomaly Resolution Office (AARO). The Department of the Army submitted one minute and 49 seconds of infrared sensor footage showing a targeting system panning, zooming, and cycling contrast to track two anomalous areas of contrast. Tellingly, the reporter submitted the video without any oral or written description of the observation (vid-1006111). The anomaly is no longer an event requiring a narrative; it is simply raw sensor data fed into a continuous pipeline.
The Historiography Thesis: Instruments Shape the Curve
The archival record suggests a clear historiographical thesis: the shape of the UAP sighting curve depends entirely on the instrument of collection.
In 1948, the primary instruments of collection were human observers and ad hoc reporting channels. When a military alert was issued or media attention peaked, pilots and ground personnel actively scanned the skies for anomalies. This sociological feedback loop created the "wave"—a spike in reports driven as much by human attention as by any underlying physical phenomenon. The 1948 memo noting this periodicity was, in part, measuring the military's own cycles of anxiety.
Today, the instruments of collection are persistent, automated, and destigmatized. Infrared targeting pods, advanced radar, and standardized MISREP forms do not read the news, nor do they require a special intelligence alert to function. When reporting an anomaly becomes a routine, destigmatized administrative task, the dramatic "wave" flattens out. It becomes a statistical stream.
For researchers asking why there are no more great UFO waves, the UAP Archives provide a sober answer: the waves still exist, but they have been institutionalized. They are no longer front-page panics; they are rows in a classified spreadsheet, quietly negotiated by disclosure analysts and logged by automated sensors.
What the document does not say
To maintain strict archival accuracy, it is vital to note what these declassified files do not establish:
- No extraterrestrial confirmation: While the 1948 USAF memo notes that Swedish intelligence theorized the objects originated from a "previously unknown or unidentified technology, possibly outside the earth" (45b2fdb6c919cd8e), the USAF itself does not endorse this conclusion in the document.
- No identification of the 2020s UAPs: The 2020 MISREP (58219b8000454aa2), the 2025 INDOPACOM tearlines (10c11e9bf4d66861), and the 2026 Army infrared video (vid-1006111) offer no prosaic explanations or identifications for the objects tracked by military sensors.
- No explanation for the 1948 radar tracks: The documents do not provide a resolution for the F-61 radar encounter in Japan or the Goose Bay radar track (1d9722f764878359).
Read it yourself
Verify the history of UAP reporting directly through the declassified source files:
