Data and Model Views of Energy Input to the Dayside Thermosphere When the East-West Interplanetary Magnetic Field Is Large

Details Data and Model Views of Energy Input to the Dayside Thermosphere When the East-West Interplanetary Magnetic Field Is Large Data and Model Views of Energy Input to the Dayside Thermosphere When the East-West Interplanetary Magnetic Field Is Large

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm24b..05k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM24B-05

Mathematics

Logic

[0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [2716] Magnetospheric Physics / Energetic Particles: Precipitating, [7934] Space Weather / Impacts On Technological Systems, [7969] Space Weather / Satellite Drag

Scientific paper

Neutral density distribution and its variation are of significant concern to those you need to determine low earth satellite orbits. Observations of Poynting flux made by the DMSP F-15 satellite reveal a set of geomagnetic storm events with anomalous, large Poynting deposition in regions of persistent density upheavals. The OPENGCM MHD output shows these features as narrow elongated crescents into the dayside thermosphere. The extreme energy input occurs within narrow ExB-associated flow channels. Most of these events are associated with dominant in-the-ecliptic interplanetary magnetic field values, often, but not exclusively, while the IMF Bz is positive. It is possible that the merging configuration created during large IMF By also provides an abundance of low-energy magnetosheath-particles to layers overlying the regions of large Poynting flux. Thus a dual heating mechanism may exist for the dayside thermosphere when the IMF By component is large. We explore the patterns of low-energy particle precipitation during large IMF By events and compare these to the Poynting flux. We will discuss the relation of these events to statistical patterns of Joule heating, particle precipitation and neutral density upheaval.

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