Condign volumes 1 to 3

Read from the scan by GLM-OCR; expect the odd misread word.

4. Motion A high angular velocity is produced because the phenomenon is light (i.e. nothing (no mass) actually moves physically). It is analogous to the movement of a CRT beam when the spot (i.e. UAP) moves. The very high angular velocity can give the impression that the light is at much lower altitude than is the case. The actual altitude of the nocturnal lights is $ \sim 5 0 \mathrm{k m} $

5. Power Light emission occurs when ionized molecules or ionized atoms re-combine with electrons, with a sharp increase when the electrons are stopped. At the path end, when the electrons are stopped, a disc-shaped light is always originated, with its axis always parallel to the earth's geomagnetic field. The power of reflected light which is required for an observer on Earth (by comparison with that from other air-objects, including satellites) is estimated as between 0.3 and 3kW. A calculation of power (with its emission as visible energy) available from the postulated electric field phenomena, is 10 to 100kW, well exceeding that required.

6. Radar Echoes Radar echoes can be obtained due to the conductivity of the ionised air. The light emitting layer, caused by the electrons, is probably an effective radar target although, in some instances, this would be well above the elevation-slant range capability of typical terrestrial search radars, and beyond the slant range of air intercept radars. Radar detection of UAP is considered in Volume 2, Working Paper No 5 and at Volume 3.