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Scientific Study of Unidentified Flying Objects (the Condon Report, complete, three volumes)

University of Colorado · 1969-01 · 1497 pages · text from the file's own layer

This is the final report of the Scientific Study of Unidentified Flying Objects, conducted by the University of Colorado under Air Force contract F44620-67-C-0035, with Edward U. Condon as scientific director and Daniel S. Gillmor as editor. It was submitted to the National Academy of Sciences on 15 November 1968 for review. The report includes field studies, photographic and radar analyses, case studies, historical chapters and appendices such as the Robertson Panel report and the Twining letter.

nature of the objects. One of the objects, described as "a greenish- blue light that moved slowly away," may have been a star. In most 'nstances the radar turget~ did not seem directly related to the visunl UFOs. 'llli5 is characteristi c of radar anomalous propa- gation returns. The refractivity profiles both show highly refractive surface layers, with a 6.7°C (12.1 0 F) surface inversion at Topeka and a 9.7°C (l7.S°r) sllrfacc~ inversion at Oklahoma City. In addition, the Topeka profile' shows a strong elevated layer at. 2720 m. with a O.6°C inversion. The temperature inversion at Oklahoma City ~roduced a o surface layer having an optical refractivity gradient (at SS70A) of -101 km- 1 ; thi~ 1.[1)<:." would extend ehe theoretical optical horizon for the eye of ml observer 2 m. above the surface of a smooth earth from the normal vaIL::' of 5.6 km. (9 mi.) to 8.S km. (about J4 mL). Such inversions Can produce many stran~e cffect~, including the visibility of objects normally well below the horizon. In summary, since the atmospheric condi ti ons were contluci ve to anomalous radar propagation I and the raddr targets di sp layed AP-like characteristics, this incident may probably be clas~ificd as con- sisting of radar false targets, w~th associated optical sightings that may have been enhanced by a strong temperature inverslon at the surface. Class J l~B. Primari 11 radar, returns mostly 5in~le, sha!J.l.J.. aircraft~likc ~..!..ips, behaving in a continuous manner (i .('. '. no sudden jUJnlJS I-S!.~ ~._ \\alcsvil1e-WC'stmorland, N. Y" 1-2 ,JUly lDS4, llOS-1127 J.S'I'. Weather: apparently clear. On I ,July EJS4 reports came into the :\F Uepot lit Rome, N. Y. of an liFO havin~ the appeanln\'e of a balloon. '11H~ officer ill charge ~uid he helieved .it to be! a purtin]1y defl1tcd 240 nature of the objects. One of the objects, described as "3 greenish- blue light that moved slowly away." may have been a star. In most 'nstances the radar targets did not seem directly related to the visunl UFOs. 'nds is characteristic of radar anomalous propa- gation returns. The refractivity profiles both show highly refractive surface layers, with a 6.7°C (12.1°F) surface inversion at Topeka and a 9.7°C (17.5°1') surface inversion at Oklahoma City. In addition, the Topeka ~n'ofil" shrvls a strong elevated layer at 2720 m. with a O.6 n C inversion. The temperature inversion at Oklahoma City ;lyoduced a o surface layer having an 0ptical refractivity gradient (at S570A) of -101 km- 1 ; thi~ la)~~ would extend the theoretical optical horizon for the eye of Ill! oC'_ierver 2 m. above the surface of a smooth earth from the normal va)\,) of 5.6 kll1. (9 mi.) to 8.S km. (about 14 1111.). Stich inversions can produce many stran~e offects, incl1lding the visibility of objects normally well below the horizon. In summary, si.nce the atmospheric condi ti OIlS were conuuci vo to anomalous radar propagation, and the raddr targets displayed AF-like characteristics, this incident may probably he classified as con- sisting of radar false targets, w~th associated optical sightings that may have bc£n enhanccd by a strong temperature inversion at the surface. Clas:-i J ;-l~. Primari ly raciar, returns mostly single, sha!'r..!.. aircraft-like ~.l.lps, behaving in a continuous manner.J..i '("'. no sudden jumps. ct l'. 1 . 19-1i. \Ialcsvil1<.'-Wcstmorland, N. Y., .1-2 .)lIly .1!J!)4, llOS-1127 I.S'I'. Weather: apparently ClCIlT. On I _Jllly EJ!i4 repol't~ came into the !\r Uerot lit Rome, N. Y. of an liFO having the appear!ln,'e of H balloon. '11H~ officer in chaT'ge said he hclievcd.it tu be. a partil111y dcfl1tcd 240

Cases discussed

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Report, from the classic collection. The PDF is mirrored here; the original link is under it. 1497 pages are in the text index: search them above, or from the library's search.