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During the summer of 1962 the potential gradient was measured at Mercury, Nevada, as a function of height above ground level. At the earth's surface the value was +30 v/m; this rose steadily with altitude to reach a maximum of +110 v/m at a height of about 1200 m. The interpretation of these results suggests that the surface γ‐ray activity for areas adjacent to atomic weapon test sites in Nevada is perhaps ten times the normal background.

Phase and amplitud e of fiv e NPC wavefront co mpone nt s were recorded at Tracy, Californ ia in March 1964 at a tim e wh e n th e s unri se and s unset lin es were almost p aralle d with th e propaga ti on path. La rge ra pid ph ase and a mplitud e variation s were associate d with sunri se; and at s un set, exac tl y o ne full cyc le of ph ase was acc umul a ted o n 18 of 20 days of recording. Su mm at ion calcula ti o ns based on sim plifi e d ray th eo ry we re ab le to ex plain, a t least qualitative ly, mo s t of the gross featur es of th e data. Howeve r, phase accum ul ati on on thi s particular pat h see ms to req uire an ionosp he ri c mod e l in which partica] re Aec ti o ns ca n be received s imult a neo us ly from two he ight s during the illuminati on tra ns it io n.