Recent Rice Convection Model Calculations of Subauroral Electric Fields

Details Recent Rice Convection Model Calculations of Subauroral Electric Fields Recent Rice Convection Model Calculations of Subauroral Electric Fields

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa44a..04w&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA44A-04

Other

2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2463 Plasma Convection (2760)

Scientific paper

We present results from recent Rice Convection Model simulations of inner magnetospheric and subauroral ionospheric electric fields, with emphasis on prompt penetration electric fields and the formation of Subauroral Polarization Streams (SAPS). During a magnetic storm prompt penetration electric fields are most apparent when the plasma sheet is hot and the ionospheric conductance is high. In an idealized major storm simulation, while prompt penetration was substantial, shielding was still significant. Much stronger penetration fields were recorded in another simulation run in which the region-2 Birkeland currents were artificially set to zero. We present results from computer experiments designed to investigate to what extent electric-field penetration in a major storm is due to the change in cross-polar-cap potential drop, and to what extent it is due to reconfiguration of the magnetospheric magnetic field. We report on computer experiments that explore the dependence of SAPS electric fields on ionospheric conductance and other factors. Downward region-2 currents and a conductance drop at the equatorward edge of the diffuse electron aurora seem to be necessary conditions for the formation of a SAPS. A localized reduction in Pedersen conductance in the SAPS region results in an electric field enhancement, roughly in proportion to the inverse square root of the conductance.

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