DIS Scientific & Technical Memorandum 55/2/00: Working Papers 12 and 13

This document, titled DIS Scientific & Technical Memorandum 55/2/00, comprises two working papers (No. 12 and No. 13) dated January and February 2000. The memorandum serves as a technical reference for evaluating UAP reports by examining potential natural and scientific causes. Working Paper No. 12, 'Earth's Magnetic Field in the UKADR,' investigates the relationship between geomagnetic field variations and UAP events. It references research by Persinger regarding human physiological responses to modulated magnetic fields, suggesting that the experimental fields used in his studies produce effects similar to those described in close-encounter UAP reports. The paper also details the methodology for monitoring magnetic field changes via the Sub-Auroral Magnetometer Network (SAMNET) and provides a magnetic survey of the UK. Working Paper No. 13, 'Visual Meteorological and Other Natural Atmospheric Phenomena,' provides a comprehensive list of natural occurrences that may be misidentified as UAP. These include various cloud formations such as lenticular, noctilucent, and mother-of-pearl clouds, as well as optical phenomena like sun dogs, halos, and St. Elmo's Fire. The document includes several figures illustrating various UAP shapes—such as cigars, triangles, and boomerangs—and provides photographic evidence from locations including Rochdale, Belgium, and the Soviet Union to assist in the identification and filtering process of UAP reports.