Temperature Variations in the Upper Atmosphere during Geomagnetically Quiet Intervals

Details Temperature Variations in the Upper Atmosphere during Geomagnetically Quiet Intervals Temperature Variations in the Upper Atmosphere during Geomagnetically Quiet Intervals

Jun 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964saosr.152.....j&link_type=abstract

SAO Special Report #152 (1964)

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Scientific paper

The drag analysis of low-perigee satellites such as Injun 3 and Explorer 17 at a time of low solar activity has revealed appreciable fluctuations in upper atmosphere temperature during geomagnetically undisturbed days. These temperature variations are very nearly proportional to the variations in the Kp index, in contrast with the temperature variations during magnetic storms, which show proportionality with the ap index. When Kp < 3, the temperature increase corresponding to a unit increase in Kp is about 40°. This corresponds to a value of ΔT/Δap close to 8°, six or seven times larger than that found in magnetic storms. Since the average value of Kp outside magnetic storms is about 2, the temperature on undisturbed days must be about 80° higher than that corresponding to Kp = 0. This again raises the question whether no heat source other than solar EUV is present when Kp = 0.

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