Dayside Thermospheric Upwelling Driven by Magnetospheric Energy Input

Details Dayside Thermospheric Upwelling Driven by Magnetospheric Energy Input Dayside Thermospheric Upwelling Driven by Magnetospheric Energy Input

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm32a..08w&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM32A-08

Physics

[2706] Magnetospheric Physics / Cusp, [3369] Atmospheric Processes / Thermospheric Dynamics

Scientific paper

In recent years, accelerometer data from the Champ and GRACE satellites has illustrated that the thermospheric density at high latitudes can be highly structured in both space and time. The standard interpretation is that the thermosphere is responding to spatially and temporally structured energy inputs from the magnetosphere. In this presentation we report on our studies to test this hypothesis and determine whether the electromagnetic energy flux (Poynting) or precipitating particle energy flux is the main driver of thermospheric upwelling at high latitudes. To determine the magnetospheric energy input we use data from satellites of the Defense Meteorological Satellite Program (DMSP) which carry a suite of space environment sensors whose data can be used to quantify magnetospheric energy input to the upper atmosphere. These include (1) an ion/electron precipitation spectrometer (30 eV - 30 keV), (2) an ion retarding potential analyzer, (3) an ion driftmeter, and (4) a magnetometer. Data from the spectrometer can be used to quantify precipitating particle energy flux while measurements of plasma drifts and magnetic perturbations can be combined to find down-going Poynting flux. To determine the thermospheric response to this energy input we use densities derived from drag measurements made by the GRACE and Champ satellites. We use a method recently developed by Burke et al. [2009] to convert the thermospheric density increases into atmospheric energy gains in order to compare with the magnetospheric energy supplied.

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