Exospheric Temperatures Derived from CHAMP Accelerometer Data

Details Exospheric Temperatures Derived from CHAMP Accelerometer Data Exospheric Temperatures Derived from CHAMP Accelerometer Data

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa41b..07w&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SA41B-07

Physics

0355 Thermosphere: Composition And Chemistry, 3315 Data Assimilation, 3369 Thermospheric Dynamics (0358), 7969 Satellite Drag (1241), 7974 Solar Effects

Scientific paper

We have used neutral densities (rho) inferred from accelerometer measurements of the polar-orbiting CHAMP satellite to compile a database of exospheric temperatures (T') during the declining phase of the recent solar- cycle. Our ultimate goals are to quantify the thermosphere's total energy budget and identify the sources apparent in response to geomagnetic activity. Data were treated in two ways. The first used orbit-averaged values of rho. The second method binned rho according to latitude, local time, altitude (h) and rho. Equivalent values of T' were then estimated using rho-h-T relationships implicit in the Jacchia 70 model. Our analysis focused on the behaviors of globally averaged T' with derived latitude-versus-local time distributions. Specifically, we compared observed ratios of daytime maxima with nighttime minima with Jacchia-model predictions T' max = 1.28 T' min. For the years 2001 to 2005 the average ratio is 1.4, but ranges from 1.58 in 2001 to 1.29 in 2005. The ratio also exhibits a seasonal dependence. In particular during the July 2002 semiannual minimum, a very high ratio resulted from a particularly cold average nighttime minimum temperature for the May-August period. Implications for modeling distributions of T' and normalizing them to global averaged values will be discussed.

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