Quantifying the sources of the disturbed electrodynamics

Details Quantifying the sources of the disturbed electrodynamics Quantifying the sources of the disturbed electrodynamics

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa42a..05m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA42A-05

Physics

[2409] Ionosphere / Current Systems, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2435] Ionosphere / Ionospheric Disturbances, [2447] Ionosphere / Modeling And Forecasting

Scientific paper

Equatorial ionospheric electric currents and fields can be significantly disturbed due to the solar-wind-magnetosphere-ionosphere interactions. This disturbed electric field is one of the key drivers to initiating ionospheric plasma irregularities. The challenges to understanding the response of the equatorial electrodynamics to external forcing require understanding the coupling between the magnetosphere and ionosphere and the effects on the ionosphere, thermosphere, and plasmasphere, and their mutual interactions. The goal of this study is to perform a comprehensive analysis and validation of the disturbed electric field, plasma ExB drift, and the neutral wind obtained from a self-consistent first-principles model of the coupled inner magnetosphere-thermosphere-ionosphere-plasmasphere system, and to perform comparisons with Communication and Navigation Outage Forecast System (C/NOFS) measurements. In this presentation, we will attempt to identify the dominant drivers of the disturbed electric field and their time scales in real events, including separating the contribution from magnetospheric (prompt penetration), ionospheric (conductivity) and thermospheric (neutral wind) processes. In particular, we will assess the relative importance of the magnetospheric sources, including plasmasheet conditions, polar cap potential, and magnetospheric magnetic field variations as they typically introduce a great deal of variability in the modeled electric field. An improved elucidation of the disturbed electric field is expected to help us understand the physical processes controlling the formation and growth of ionospheric irregularities.

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