Behavior of the Ionosphere and Thermosphere at Solar Minimum: Data and Model Comparisons and Analysis

Details Behavior of the Ionosphere and Thermosphere at Solar Minimum: Data and Model Comparisons and Analysis Behavior of the Ionosphere and Thermosphere at Solar Minimum: Data and Model Comparisons and Analysis

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa21c..03p&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA21C-03

Physics

[2400] Ionosphere, [3369] Atmospheric Processes / Thermospheric Dynamics, [6929] Radio Science / Ionospheric Physics, [7949] Space Weather / Ionospheric Storms

Scientific paper

UV remote sensing is the single most powerful technique for making space-based global observations of the ionosphere and thermosphere. During the descending phase of the last solar cycle and the current solar minimum we have had the opportunity to make unique observations of the behavior of the upper atmosphere. Comparisons with models are particularly important because they inform our understanding of the physics. All too often one hears that "we understand the physics": while we may be able to write down the equations and solve them numerically there are many unknowns or poorly known processes that are parameterized. In addition, the boundary conditions are arguably the least well known of the "knobs" on the upper atmosphere GCMs. Under solar minimum conditions we have an opportunity to observe the quiescent state of the upper atmosphere and its response to impulsive drivers. We will present results from our examination of the response of the upper atmosphere to the sudden stratospheric warming events of 2008 and 2009. In this paper we study isolated events against that quiescent background and compare our observations to models. IRI and MSIS show significantly different behavior from our UV remote sensing data. Is this because the models were based on data obtained from a different atmosphere - one that had lower CO2 values - or is it the unique nature of this solar minimum?

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