Impact of CIR Storms on Thermosphere Density Variability during the Current Solar Minimum

Details Impact of CIR Storms on Thermosphere Density Variability during the Current Solar Minimum Impact of CIR Storms on Thermosphere Density Variability during the Current Solar Minimum

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa22a..01l&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA22A-01

Astronomy and Astrophysics

Astrophysics

[0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry, [0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [7511] Solar Physics, Astrophysics, And Astronomy / Coronal Holes

Scientific paper

The current solar minimum is exceptionally quiet, with sunspot numbers at their lowest in at least 75 years. During this unique solar minimum epoch, however, solar wind high speed streams emanating from near-equatorial coronal holes occurred frequently and are the primary contributor to the continuous geomagnetic activity at the Earth. These conditions enable the isolation of forcing by geomagnetic activity on the preconditioned solar minimum state of the upper atmosphere caused by Corotating Interaction Regions (CIRs). Intense magnetic field regions or CIRs are due to the interaction of high-speed corotating streams with the upstream low speed solar wind, and high density current plasma sheet. Thermosphere density observations around 400 km from the CHAMP satellite are used to study the thermosphere density response to the CIR storms. The impact of intense magnetic field and high raw dynamic pressure in the heliosphere current sheet of CIRs and the geoeffectiveness of the CIR streams on geomagnetic activity and the resultant thermosphere density variability are investigated. The thermosphere density variations at the periods of 9 and 13.5 days associated with the recurrent geomagnetic activity are also isolated from the low solar flux preconditioned state during this extreme solar minimum. Further, the relationship between the distribution of the coronal holes on the Sun and the duration of the high speed solar wind streams and recurrent geomagnetic activity is also discussed on the basis of the EUVI observations from the STEREO satellites.

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