Spatial dependence of the local energy transfer across the magnetopause and the influence of interplanetary variation from Cluster observations

Details Spatial dependence of the local energy transfer across the magnetopause and the influence of interplanetary variation from Cluster observations Spatial dependence of the local energy transfer across the magnetopause and the influence of interplanetary variation from Cluster observations

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51c1411f&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM51C-1411

Physics

2723 Magnetic Reconnection (7526, 7835), 2724 Magnetopause And Boundary Layers, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

We use the multi-spacecraft mission Cluster to make observational estimates of the local energy transfer across the magnetopause. Eight magnetopause crossings at different spatial locations and during varying interplanetary conditions have been investigated. We attempt to determine the spatial dependence of the local energy transfer and the influence of varying solar wind conditions such as velocity, density and the Interplanetary Magnetic Field (IMF) on the estimated magnitude. The local energy transfer is found to be positive, i.e. transferred from the magnetic field to the particles, as expected when Cluster is close to a reconnection region and detects high-speed plasma jets. When Cluster is located on the flanks of the magnetopause the energy input is strongly dependent on the location and on interplanetary conditions. For southward IMF the energy transfer is negative corresponding to the inflow of energy from the solar wind to the magnetosphere and varies with the magnitude of the southward component and the spatial location of the observation. For northward IMF there is no or little energy flow across the magnetopause flanks. The observations are in good agreement with the current understanding on where and how the energy is transferred across the magnetopause. However, a larger statistical set of magnetopause crossings is needed in order to draw qualitative conclusions on the interplanetary as well as spatial dependence on the magnitude of the local energy transfer.

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