Altitude Response of the Thermosphere Mass Density to CIR/HSS Storm in Solar Minimum

Details Altitude Response of the Thermosphere Mass Density to CIR/HSS Storm in Solar Minimum Altitude Response of the Thermosphere Mass Density to CIR/HSS Storm in Solar Minimum

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa32a..01l&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA32A-01

Physics

[0350] Atmospheric Composition And Structure / Pressure, Density, And Temperature, [0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry, [0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [7969] Space Weather / Satellite Drag

Scientific paper

Mass density measurements by the CHAMP and GRACE satellites were used to study the altitude response in thermosphere density during a Corotating Interaction region (CIR)/ High Speed Stream (HSS) period in Dec, 2008 when the CHAMP and GRACE satellite orbits were coplanar (same local time: 08 and 20 LT). The mass density response at the two different altitudes is evaluated by estimating the mass density ratio from active and quiet geomagnetic conditions. During the CIR/HSS period 03-10 December 2008, less mass density response in the winter hemisphere was observed at the GRACE altitude (476 km mean altitude) than at the lower CHAMP altitude (332 km mean altitude) during the CIR/HSS period. The change in density at GRACE and CHAMP altitudes from quiet to active conditions is evaluated based on changes in pressure, composition and temperature. The NRLMSISE00 model illustrates an important altitude transition in density response to CIR/HSS activity between the GRACE and CHAMP altitudes. The results indicate that a substantial percentage of helium must be present that reduces the density response at GRACE altitudes to geomagnetic activity.

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