Mathematics – Probability
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12b..03t&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM12B-03
Mathematics
Probability
2716 Energetic Particles, Precipitating, 2724 Magnetopause, Cusp, And Boundary Layers
Scientific paper
The interconnection of magnetic fields through magnetic reconnection at the magnetopause is the dominant process for mass, energy and momentum transfer from the Earth's magnetosheath to the magnetosphere. Earlier studies on the location of the reconnection line during northward IMF conditions and high solar wind dynamic pressure revealed an approximately equal probability for anti-parallel and component reconnection between the interplanetary magnetic field (IMF) and the geomagnetic field. Using data from the Toroidal Imaging Mass Angle Spectrograph (TIMAS) on the Polar spacecraft we have increased our survey over the entire cusp data base, selecting events with northward IMF but no restrictions on the solar wind dynamic pressure. The distance to the reconnection line is calculated by using the proven method of 3D cuts of the proton distribution function in the cusp to identify the low energy cut-off of precipitating ions. Anti-parallel or component reconnection is identified by tracing the distance to the reconnection line along the geomagnetic field line to the reconnection site. We find that both reconnection scenarios, antiparallel and component reconnection, occur for the same IMF conditions. The observation of either antiparallel or component reconnection depends entirely on the location of the observing spacecraft.
Fuselier Stephen A.
Petrinec Steven M.
Trattner K. J.
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