Variations in air density at heights near 200 km during 1967–1969, from the orbit of 1967-31A |
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| Authors: | Bruce R Bowman |
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| Institution: | Hawaii Institute of Geophysics, University of Hawaii, Honolulu, HI 96822, U.S.A. |
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| Abstract: | Air density at a height of 180–200 km from July 1967 to September 1969 has been determined from analysis of the high eccentricity orbit of satellite 1967-31A. The data show good correlation between sudden density increase and geomagnetic disturbance. The increases for disturbances of equal strength are approximately 40% greater during night-time than daytime hours. The day-night influence is also observed in the changes in density with changes in the solar flux index, F10. The 27-day density variation is predominant mainly during night-time, although the atmospheric response to F10 variations is quite variable regardless of local time. A semi-annual variation of approx. 40% is observed. Also found is a 25% diurnal variation for heights near 170–180 km, which is in good agreement with the CIRA 1972 atmosphere. |
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