Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm52d..07b&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM52D-07
Physics
2708 Current Systems (2409), 2716 Energetic Particles, Precipitating, 2788 Storms And Substorms
Scientific paper
During the superstorm of April 2000 four DMSP satellites crossed ~ 1A/m sheets of field-aligned current (FAC) that were widely distributed in local time and centered at magnetic latitudes less than 60° . FAC positions relative to particle precipitation boundaries (B2e, B2i), described by Newell et al., [1996], mandate generation sources in the central plasma sheet. The phenomenon repeated four times near the storm's maximum epoch, on each occasion after the AE index indicated a pseudo breakup event. As the evening-sector system decayed, an upward FAC sheet formed near the equatorward boundary of auroral electron precipitation. This requires a westward ion pressure gradient in the inner plasma sheet near 21:00 MLT, consistent with radially differential gradient-curvature drifts subsequent to substorm-like plasma injections into a ring-current inflated inner magnetosphere. Net Poynting fluxes, estimated from measured magnetic and electric field perturbations, indicate that these FACs carry several percent of the total ring-current energy into the mid latitude ionosphere where it dissipates as Joule heat.
Burke William J.
Huang Chang-Yin
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