Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm54a..02t&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM54A-02
Physics
2706 Cusp, 2716 Energetic Particles: Precipitating, 2723 Magnetic Reconnection (7526, 7835), 2724 Magnetopause And Boundary Layers
Scientific paper
The magnetospheric cusp regions always play an important role in the study of magnetic reconnection at the Earth's magnetopause. Whatever process occurs at the magnetopause, a signature of the process can be found in the precipitating magnetosheath ions observed in the cusp as well as down in the ionosphere where the foot points of all magnetopause field lines converge to a relatively confined region. Plasma observations in the cusp and to in situ observations of field-aligned plasma flows close to the magnetopause (consistent with the occurrence of magnetic reconnection) have demonstrated that the fundamental process of magnetic reconnection occurs somewhere at the magnetopause for any condition of the interplanetary magnetic field (IMF). The distinct dispersion signature of the precipitating ions can be used to gain insights into details of the reconnection process, covering continuity, pulsation frequency, and location of the reconnection site. Observations of the FUV emissions caused by precipitating cusp ions in the ionosphere at the magnetic foot points of the cusp demonstrate the global nature of magnetic reconnection and provide insights into the temporal nature of the process, showing continuous ionospheric emissions during changing IMF conditions. In this review presentation, observational evidence of magnetic reconnection in the cusp will be summarized.
Fuselier Stephen A.
Petrinec Steven M.
Trattner K. J.
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