Numerical Estimates of Polar Cusp Neutral Upwelling Using Satellite Conjunction Data

Details Numerical Estimates of Polar Cusp Neutral Upwelling Using Satellite Conjunction Data Numerical Estimates of Polar Cusp Neutral Upwelling Using Satellite Conjunction Data

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa21b1548s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA21B-1548

Physics

2475 Polar Cap Ionosphere, 2706 Cusp

Scientific paper

Recent observations have confirmed neutral particle upwelling at high latitudes which are localized to the polar cusp region and seem to be correlated to high auroral activity. For decades, thermospheric upwelling has been recognized as an important topic and has been studied observationally and theoretically, with efforts largely focused on Joule heating being the basic driver. As data and models have improved over the years, Joule heating has indeed proven to be fundamental to upwelling, at least at lower altitudes. At higher latitudes, however, the situation appears to be more complex and recent results indicate that Joule heating alone is not adequate. We investigate this issue with numerical models using data acquired by FAST and CHAMP satellites. Field and particle data from FAST and accelerometer data CHAMP are used from a single favorable conjunction alignment event. We compare results from two different models: a Joule heating model ("thermodynamic") and an auroral precipitation model "electrodynamic").

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