Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa12a..06b&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA12A-06
Physics
0350 Pressure, Density, And Temperature, 0358 Thermosphere: Energy Deposition (3369), 7954 Magnetic Storms (2788)
Scientific paper
The STAR accelerometer on the CHAMP satellite has made it possible to accumulate near-continuous records of thermosphere density at approximately 400 km altitude since May 2001. The response of the thermosphere under extremely quiet geomagnetic conditions, as well as for virtually every significant geomagnetic storm and all levels of activity in between, has been recorded during this period. The solar activity has decreased since the beginning of the mission, when the solar cycle was at its peak, to minimum conditions or nearly so at the end of 2006. CHAMP is in a near-polar and quasi-circular orbit, and complete local time sampling is obtained about every 4 months. Therefore, this density dataset offers unique opportunities to study the variability of the thermosphere due to geomagnetic disturbances in relation to solar activity, season, solar local time, and latitude. In the present study, the complete CHAMP density database is analyzed in terms of variability as a function of latitude band. Density residuals, obtained by de-trending the data using moving averaging windows, are computed to that purpose. The variability is characterized by the large-scale (1000 4000 km) and medium- scale (160 - 600 km) disturbances, which are isolated by forming the residuals. Sometimes the disturbances represent wave-like structures. The orbit-to-orbit and day-to-day variability are also calculated, in this study by comparing the mean densities of consecutive orbits and days, respectively.
Bruinsma Sean L.
Forbes Jeffrey M.
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