Mathematics – Probability
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm23b..07s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM23B-07
Mathematics
Probability
2706 Cusp, 2716 Energetic Particles: Precipitating, 2723 Magnetic Reconnection (7526, 7835), 2736 Magnetosphere/Ionosphere Interactions (2431), 2744 Magnetotail
Scientific paper
An automated algorithm for detecting Low Energy Cutoffs (LEC) in the energy spectrum of precipitating ions was developed. LECs are indicative of time-of-flight effects. The occurrence of LEC spectra was mapped in DMSP observations. There are four distinct components to this map, two of which are produced by reconnection. On the dayside LEC ion spectra are seen in cusp, mantle and open-LLBL precipitation, predominantly at sub-keV energies, as the result of dayside reconnection. On the nightside LEC are seen at the poleward edge of the oval at super-keV energies (usually dispersed with latitude), that indicate magnetotail reconnection. There is another super-keV population seen on the dusk side at the equatorward edge of the oval, likely reflecting the structure of the Alfven layer. Finally, a sub-keV population seen throughout the auroral oval is thought to consist of ions accelerated out of the opposing hemisphere. Probability maps of the various signatures are presented. The presence of the nightside reconnection signature is found to be more strongly modulated by magnetic activity level than by substorm phase. Further characteristics of this reconnection signature will be discussed.
Gjerloev Jesper W.
Liou Kan
Meng Chun
Newell Patrick T.
Rich Frederic J.
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