Nightside Ionospheric Electrodynamics Associated with Substorms: Multi Instrument Observations

Details Nightside Ionospheric Electrodynamics Associated with Substorms: Multi Instrument Observations Nightside Ionospheric Electrodynamics Associated with Substorms: Multi Instrument Observations

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm21a..03z&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM21A-03

Physics

2409 Current Systems (2721), 2437 Ionospheric Dynamics, 2712 Electric Fields (2411), 2736 Magnetosphere/Ionosphere Interactions (2431), 2790 Substorms

Scientific paper

Poker Flat Incoherent Scatter Radar (PFISR), as a next-generation ISR with phased-array antenna system, can measure multiple ionospheric parameters with unprecedented temporal resolution and thus enables us to study rapidly evolving ionospheric processes, such as those associated with substorms. In this paper, we present observations from PFISR and complimentary ground-based magnetometers and THEMIS all-sky imaging array for substorm events and discuss the evolution of the nightside ionospheric convection as well as the current closing system, with particular emphasis on those near the Harang reversal region. Distinct but persistent features are found west of, within, and east of the onset region. By synthesizing observations from these three categories, as well as those from the SuperDARN radars and the IMAGE satellite, a 2-D picture of the evolution of ionospheric substorm electrodynamics has been established, which reveals features of an important relationship between the Region 2 and the substorm current systems. We believe these new observations can contribute to a better understanding of the magnetosphere-ionosphere coupling process during substorms and shed light on the underlying magnetospheric dynamics.

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