Response of Dayside Thermosphere to an Intense Geomagnetic Storm

Details Response of Dayside Thermosphere to an Intense Geomagnetic Storm Response of Dayside Thermosphere to an Intense Geomagnetic Storm

Jan 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974natur.247...23a&link_type=abstract

Nature, Volume 247, Issue 5435, pp. 23-25 (1974).

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INCREASES in the density of the neutral thermosphere associated with geomagnetic activity were first noted by Jacchia1. Although the thermosphere will not be in equilibrium, and acceleration by electrodynamic forces may be involved, on balance the increased density must reflect additional heating. Further studies2-4 by orbital drag analysis from observations of artificial Earth satellites have led to a complex and somewhat confusing picture. The heating seems to be slightly greater3,4 at high latitudes and, for larger disturbances, sometimes much greater2,3. Also, the heating seems to be slightly greater3,4 on the nightside, but possibly with the opposite trend3 for larger disturbances (Kp > 5). Jacchia et al.3 also found that the time delay between the peak of the storm, as measured by the planetary 3-h indices Kp or ap, and the maximum response was a little shorter at high latitudes; on the other hand Roemer4 concluded that the time delay was independent of latitude, height or local time.

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