Extreme Poynting flux in the dayside thermosphere: Examples and statistics

Details Extreme Poynting flux in the dayside thermosphere: Examples and statistics Extreme Poynting flux in the dayside thermosphere: Examples and statistics

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3816102k&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 16, CiteID L16102

Physics

2

Atmospheric Composition And Structure: Thermosphere: Energy Deposition (3369), Ionosphere: Current Systems (2721), Magnetospheric Physics: Cusp, Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

With the launch of the Defense Meteorological Satellite Program F-15 spacecraft in late 1999, data for calculating Earth-directed, magnetospheric Poynting flux became available for the 09-21 solar local time sectors. We have assembled a data base for this key element of the upper atmosphere energy budget, for the interval 2000-2005. Here we briefly introduce the data set and show a subset that reveals a pattern of extreme Poynting flux deposition associated with a large east-west interplanetary magnetic field component. At such times the dayside high-latitude Poynting flux may exceed 170 mW/m2—an order of magnitude above typical values. The likely source of these events is merging at the magnetopause flank and lobe. A significant fraction of these events occur with high speed solar wind. This pattern of extreme Poynting flux deposition has, to date, eluded detection. Energy deposition at these high rates is a likely source of previously reported, but poorly understood, near-cusp neutral density enhancements.

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