Other
Scientific paper
Aug 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966saosr.218.....j&link_type=abstract
SAO Special Report #218 (1966)
Other
2
Scientific paper
The density variations that accompany geomagnetic disturbances have been studied by analyzing the drag of three satellites with high orbital inclination (Injun 3, Explorer 19, and Explorer 24) and one with moderate inclination (Explorer 17). The average time delay between the peak of the geomagnetic perturbation and that of the atmosphere is 6.7 +/- 0.3 hours. While there seems to be no significant dependence of the time delay on the intensity of the perturbation and on the geographic location with respect to the sun, there appears to be some dependence on latitude. For latitudes greater than 55° (average: 65°) the mean time delay is 5.8 +/- 0.5 hours, and for latitudes smaller than 55° (average: 25°) it is 7.2 +/- 0.3 hours. All three high inclination satellites give consistently smaller delay times at high latitudes. The observed density changes are interpreted as caused by changes in temperature. For smaller perturbations (Kp < 5) the temperature T shows a nearly linear dependence on Kp, and for latitudes lower than 55° the rate of change ΔT/ΔKp is about 28°. For latitudes above 55° (average: 65°) ΔT/ ΔKp seems to be about 15 to 25 percent greater. For more intense disturbances (Kp >= 5), ΔT/ΔKp is systematically larger, confirming the nonlinearity of the relation between T and Kp, when considered over its total range; there is also a good indication that some atmospheric perturbations are enhanced in the auroral zones more than others.
Jacchia Luigi G.
Slowey Jack
Verniani Franco
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