Other
Scientific paper
Jul 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962saosr.100.....j&link_type=abstract
SAO Special Report #100 (1962)
Other
8
Scientific paper
Accurate accelerations during the years 1958 to 1961 are given for eight artificial satellite in eccentric orbits and with perigee heights between 350 and 750 km. These accelerations are corrected for the effect of solar-radiation pressure. Atmospheric densities at perigee are derived by numerical integration of the drag equation for a rotating atmosphere using a model atmosphere with diurnal bulge and taking account of the earth's oblateness. Atmopheric temperatures are derived from Nicolet's helium-topped, diffusion-equilibrium model with asymptotically isothermal temperature profiles. A preliminary analysis of these data leads to the following conclusions: (1) Nicolet's atmospheric model yields consistent atmospheric temperatures at all heights. The temperature at the center of the diurnal bulge is 35 to 40% higher than the minimum night temperature; the lag angle between the bulge and the subsolar point is about 35°. (2) Paetzold's semiannual effect is confirmed; it can be traced with decreasing amplitude throughout the 3 years covered by the observations. (3) The erratic ("27-day") density oscillations correspond to temperature oscillations ΔT = 2.5 ΔF10, where ΔF10 is the corresponding variation in the 10.7-cm solar flux. During magnetically disturbed days the atmospheric temperature is increased by an amount ΔT ~1 to 1.5 Ap, where Ap is the daily geomagnetic planetary index. (4) When the daily atmospheric temperatures are corrected to a standard solar flux with the relation ΔT = 2.5 Δ F10, there remains a systematic temperature decrease that roughly parallels the smoothed values of the decimetric solar flux or of the Wolf numbers. This effect could be minimized assuming that ΔT/ΔF10 = 4.5 instead of 2.5, but then the erratic fluctuation becomes overcorrected. (5) It is suggested that the systematic temperature decrease and the semiannual effect have a single underlying cause-corpuscular radiation, whose flux varies with the 11-years solar cycle. It appears that the corpuscular component in the heating of the upper atmosphere is quite considerable.
Jacchia Luigi G.
Slowey Jack
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