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Title: Effects of electric field methods on modeling the midlatitude ionospheric electrodynamics and inner magnetosphere dynamics

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1002/2016JA023850· OSTI ID:1369194

Abstract We report a self‐consistent electric field coupling between the midlatitude ionospheric electrodynamics and inner magnetosphere dynamics represented in a kinetic ring current model. This implementation in the model features another self‐consistency in addition to its already existing self‐consistent magnetic field coupling with plasma. The model is therefore named as Ring current‐Atmosphere interaction Model with Self‐Consistent magnetic ( B ) and electric ( E ) fields, or RAM‐SCB‐E. With this new model, we explore, by comparing with previously employed empirical Weimer potential, the impact of using self‐consistent electric fields on the modeling of storm time global electric potential distribution, plasma sheet particle injection, and the subauroral polarization streams (SAPS) which heavily rely on the coupled interplay between the inner magnetosphere and midlatitude ionosphere. We find the following phenomena in the self‐consistent model: (1) The spatially localized enhancement of electric field is produced within 2.5 < L < 4 during geomagnetic active time in the dusk‐premidnight sector, with a similar dynamic penetration as found in statistical observations. (2) The electric potential contours show more substantial skewing toward the postmidnight than the Weimer potential, suggesting the resistance on the particles from directly injecting toward the low‐ L region. (3) The proton flux indeed indicates that the plasma sheet inner boundary at the dusk‐premidnight sector is located further away from the Earth than in the Weimer potential, and a “tongue” of low‐energy protons extends eastward toward the dawn, leading to the Harang reversal. (4) SAPS are reproduced in the subauroral region, and their magnitude and latitudinal width are in reasonable agreement with data.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1369194
Alternate ID(s):
OSTI ID: 1402149
Report Number(s):
LA-UR-17-20097
Journal Information:
Journal of Geophysical Research. Space Physics, Vol. 122, Issue 5; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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