Solar wind energy transfer into the magnetosphere during a substorm event as seen near the polar cusp boundary: a case study

Details Solar wind energy transfer into the magnetosphere during a substorm event as seen near the polar cusp boundary: a case study Solar wind energy transfer into the magnetosphere during a substorm event as seen near the polar cusp boundary: a case study

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm23b1710l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM23B-1710

Physics

2724 Magnetopause And Boundary Layers, 2784 Solar Wind/Magnetosphere Interactions, 2790 Substorms, 7859 Transport Processes

Scientific paper

Energy transfer through the high altitude polar cusp-magnetosphere boundary layer during a substorm event on Feb 10, 2008, is studied by examining the properties of energy fluxes which include the convection Poynting flux, wave Poynting flux and the kinetic energy flux. The fluxes are calculated using the electric and magnetic field measurements from the Polar spacecraft. The substorm signatures are detected by Themis spacecraft and the Themis ground based observations. It is found that in the region of the cusp- magnetosphere boundary, the convection Poynting flux is the most significant energy flux among the three. There is a significant normal component of Poynting flux pointing toward the magnetosphere. We suggest that this part of the energy flux plays a more important role in the near earth energy transfer compared to the kinetic energy flux. A comparison between the observed Poynting flux and the energy flux input from the solar wind is made. A dynamo process on open field lines is discussed as a mechanism how the Poynting flux can be transferred into the magnetosphere.

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