Radial Profiles of the H+ and O+ Contribution to the Storm-Time Ring Current Energy

Details Radial Profiles of the H+ and O+ Contribution to the Storm-Time Ring Current Energy Radial Profiles of the H+ and O+ Contribution to the Storm-Time Ring Current Energy

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm52a..06g&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM52A-06

Physics

2730 Magnetosphere: Inner, 2778 Ring Current, 2788 Storms And Substorms

Scientific paper

Although recent work indicates that convection through the dayside magnetopause is a major factor in the early, rapid decay of the ring current, charge-exchange also plays a role in the loss of ring current ions. To estimate what this role is, I am analyzing a database of AMPTE CCE passes through the ring current near the peaks of magnetic storms. Comparing data from different storms should reveal how the energy carried by the two main ring current species, H+ and O+, is distributed as a function of particle energy, local time, and L value or radial distance. My goal is to estimate the charge-exchange lifetime of the ring current for these storms. I plan to do this by multiplying the ring current energy content carried by H+ or O+ in a specific energy and L range by the appropriate lifetime against charge exchange for the ion species, ion energy, and radial distance. I will sum the results to estimate the ring current decay time due to charge exchange for a storm. As a first step in this project, I am examining radial profiles of the H+ and O+ contributions to the ring current energy. I will discuss what these initial results reveal about differences in the typical energies of O+ and H+ as a function of L at different local times. Such differences may shed light on how the ring current is populated and energized. They also may help to validate ring current energy profiles inferred from global imaging.

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