Storm-time Energetic O+ Flux Variations in the Ring Current and the Plasmasheet: A Study of the April 2002 Storm Event

Details Storm-time Energetic O+ Flux Variations in the Ring Current and the Plasmasheet: A Study of the April 2002 Storm Event Storm-time Energetic O+ Flux Variations in the Ring Current and the Plasmasheet: A Study of the April 2002 Storm Event

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm41d..08o&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM41D-08

Physics

2720 Energetic Particles, Trapped, 2760 Plasma Convection, 2764 Plasma Sheet, 2778 Ring Current, 2788 Storms And Substorms

Scientific paper

The development of the ring current during intense magnetospheric storms is often discussed in terms of the energization of single-charged oxygen ions. Although it is generally accepted that the ionosphere is the ultimate source of such O+ ions, it still remains to be understood where and how they are accelerated in the magnetosphere. The present study examines global changes of oxygen ENA fluxes measured by the IMAGE/HENA instrument. A focus is placed on a storm event that took place in April 2002. When the IMAGE satellite was at vantage points during this storm event, it occasionally observed the oxygen ENA flux to increase globally within 10 min or less in the ring current region. This timescale is too short for those O+ ions to be transported from the plasmasheet. In situ measurements of magnetic field and energetic particle fluxes at geosynchronous orbit reveal simultaneous occurrence of dipolarization and particle injection. The Geotail satellite, which was located in the postmidnight magnetotail, also observed an increase of the O+/H+ ratio in the energy density in association with substorm activity. The present result indicates that the substorm-associated local acceleration is crucial for the energization of the ring-current O+ ions at storm time.

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