Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm33a1563s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM33A-1563
Physics
[2407] Ionosphere / Auroral Ionosphere, [2475] Ionosphere / Polar Cap Ionosphere, [2706] Magnetospheric Physics / Cusp, [2776] Magnetospheric Physics / Polar Cap Phenomena
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 in combination with ground-based observations. Field and particle data from FAST and accelerometer data from CHAMP are used from favorable conjunction alignment events. These conjunction data are further supplemented with ground-based radar and auroral imagers. Data from selected events are input to two different models: a Joule heating model (``thermodynamic'') and an auroral precipitation model (``electrodynamic''). We present progress in this area on two fronts. First, we obtain higher resolution results from the Joule heating model. This is accomplished by running the TIME-GCM model in a higher resolution mode and by selecting conjunction events which are simultaneously observed with ground-based radar. Second, we use ground-based all-sky cameras to observe auroral activity in the cusp during conjunction events. This will allow future comparisons of auroral intensity predictions with the auroral precipitation model.
Crowley Geoff
Lessard Marc
Lühr Hermann
Lund Eric J.
Marker S.
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