Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh21c..07s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH21C-07
Other
0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369), 7538 Solar Irradiance, 7549 Ultraviolet Emissions
Scientific paper
Thermospheric temperature and density respond primarily to forcing by solar ultraviolet radiation, which causes dramatic changes on solar-cycle and solar-rotational time scales. However, the current extended period of low solar activity provides an opportunity for studying secondary effects that are less obvious when convolved with solar variability. Geomagnetic storms are less prevalent, but periodic forcing by co-rotating streams in the solar wind have been salient features during several recent years. Dynamical and compositional features propagated from the lower atmosphere, resulting particularly in systematic seasonal variability, are easier to analyze. Secular reduction in temperature and density due to increasing carbon dioxide and other anthropogenic greenhouse gases is both larger and more detectable during solar minimum. The confluence of these effects with a particularly long and deep solar minimum lead to a thermosphere that was likely colder and less dense during the summer of 2008 than at any other time during the past several centuries.
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