Density variations in the lower thermosphere from analysis of the AE-C accelerometer measurements

Details Density variations in the lower thermosphere from analysis of the AE-C accelerometer measurements Density variations in the lower thermosphere from analysis of the AE-C accelerometer measurements

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..499m&link_type=abstract

Planetary and Space Science, vol. 25, May 1977, p. 499-507.

Computer Science

Accelerometers, Atmospheric Models, Explorer Satellites, Geomagnetic Pulsations, Satellite-Borne Instruments, Thermosphere, Annual Variations, Regression Analysis, Solar Activity Effects

Scientific paper

Density measurements at 140, 160, 180, and 200 km from the AE-C accelerometer experiment during 1974 are analyzed by least-squares multiple linear regression. The resulting empirical model is compared with the widely used Jacchia (1971) model, which is primarily based on satellite orbital-decay data above 200 km. The semi-annual and geomagnetic (Kp) variations derived from the AE-C data set are in good agreement with Jacchia's predictions. However, individual magnetic-storm responses often exceed such average representations of the geomagnetic effect by more than a factor of two. The density is more variable with respect to the daily 10.7-cm solar flux than Jacchia's model predicts. The regression analysis reveals a positive correlation with the absolute value of geographic latitude. The statistical weakness of this latter effect reflects the transient, aperiodic nature of high-latitude heating events related to magnetic activity, which can only be properly analyzed on an individual basis. Finally, the subsolar bulge effect enters the regression equation with about half the amplitude predicted by the Jacchia model at these heights.

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