Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa31b1413s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA31B-1413
Physics
[0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry, [0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [3369] Atmospheric Processes / Thermospheric Dynamics, [7969] Space Weather / Satellite Drag
Scientific paper
The sustained decrease in solar extreme ultraviolet radiation during the current minimum is greater than any in recent history. This gives us the opportunity to study neutral density conditions that are outside the domain of the available empirical models of the thermosphere. While there are currently no experiments measuring in-situ composition of the thermosphere, the accelerometers aboard the CHAMP and GRACE satellites provide a monitor of total atmospheric density, spanning most of solar cycle 23 through the current minimum (2001-2008). Using these data, complemented by ground-based measurements of satellite drag (1996-2008), it appears that agreement between data and empirical models is strongly dependent on satellite altitude during solar minimum, implying an error in our empirical knowledge of the atmospheric scale height. Knowledge of species-dependent behavior with respect to local-time and latitude gives us a crude method of separating the observed scale heights into the competing effects of composition and temperature changes.
Lin Chang-Shou
Marcos Frank A.
Sutton Eric K.
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