Modeling the Proton Precipitation During Detached Subauroral Arc Events

Details Modeling the Proton Precipitation During Detached Subauroral Arc Events Modeling the Proton Precipitation During Detached Subauroral Arc Events

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsm13a..06j&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SM13A-06

Physics

2716 Energetic Particles, Precipitating, 2736 Magnetosphere/Ionosphere Interactions, 2753 Numerical Modeling, 2756 Planetary Magnetospheres (5443, 5737, 6030), 2778 Ring Current

Scientific paper

Detached proton auroral arcs are a newly discovered phenomenon at Earth by the IMAGE satellite. These events are characterized by IMAGE-FUV observations of subauroral arcs separated from the main oval and extending over several hours of local time in the afternoon sector. The emissions have been related to the precipitation of 20-30 keV protons measured by the FAST electrostatic analyzers and plasmaspheric plumes observed by the IMAGE-EUV instrument. We simulate the proton precipitation during two subauroral arc events which occurred on 23 January 2001 and 18 June 2001. During these periods the inner magnetospheric conditions were moderately disturbed with minimum Dst=-25 nT and Dst=-61 nT, and maximum Kp=5- and Kp=5+, respectively. We use our global physics-based model, which calculates the temporal evolution of ring current H+, O+, and He+ ion distributions including losses due to charge exchange, Coulomb collisions, and wave-particle interactions along adiabatic drift paths. Measurements from the geosynchronous Los Alamos satellites are used to simulate the time-dependent plasma inflow on the nightside and to compare with model results on the dayside. The growth rate of EMIC waves is self-consistently calculated and global images of precipitating ions are obtained and compared with IMAGE observations. The characteristics of the EMIC waves induced ion precipitation are investigated as a plausible mechanism for generation of the detached proton auroral arcs.

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