Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa21c..01s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA21C-01
Other
[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2447] Ionosphere / Modeling And Forecasting, [2475] Ionosphere / Polar Cap Ionosphere
Scientific paper
The International Polar Year (IPY) began on 1 March 2007 and the period since then has been an ongoing solar minimum. Scientifically the debate has began on whether in fact the impact of this solar minimum is different from the recent 4 or 5 well documented solar minimum periods. This presentation will emphasize extended IPY observations at high latitudes that can readily be interpreted as the ionospheric climatology for this solar minimum. Then this climatology will be compared to models of the I-T region. These model/observations also enable an estimate to be made of how different this solar minimum is from prior minima. In particular, most of the models have been validated and "tuned" to the I-T of these prior solar minimum conditions, hence, differences can be interpreted as a need to review the model drivers and other "tuned" parameters. The ionospheric plasma lies within the neutral gases of the upper atmosphere and its primary daytime source is the solar extreme ultra-violet spectrum. A simple but elegant rule of thumb is that the main ionospheric layer, the F-layer is located at a fixed atmospheric pressure level. Hence, a detailed knowledge of the topside atmospheric boundary conditions and its thermal structure is crucial to obtaining a correctly located F-region. This is further confused by the lack of specificity of the F-regions topside diffusion processes, mainly the O to O+ collision frequency. For over two decades this parameter has been scaled by the ionospheric-thermospheric communities through use of a Burnside factor, or not! At high latitudes the extreme solar minimum has not been geomagnetically quiescent. Disturbances driven by the 27 day recurrent coronal hole-high speed streams have kept pumping energy into the high latitude ionosphere. An evaluation of these process, in their current status, and more significantly how this work can be continued at other latitudes are presented.
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