Using ACE Data to Separate Region-1 and Region-2 Generated Equatorial Electric Fields from the Disturbance Dynamo Electric Fields

Details Using ACE Data to Separate Region-1 and Region-2 Generated Equatorial Electric Fields from the Disturbance Dynamo Electric Fields Using ACE Data to Separate Region-1 and Region-2 Generated Equatorial Electric Fields from the Disturbance Dynamo Electric Fields

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm53a1451r&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM53A-1451

Physics

2164 Solar Wind Plasma, 2415 Equatorial Ionosphere, 2447 Modeling And Forecasting, 2712 Electric Fields (2411), 2721 Field-Aligned Currents And Current Systems (2409)

Scientific paper

Vertical plasma drift data obtained at Jicamarca is considered to be the combination of different processes, mainly the short-lived prompt penetration of interplanetary electric fields and longer lasting disturbance dynamo electric fields. In the present model the prompt penetration electric fields are obtained by inputting ACE data obtained at L1 into the Hill-Siscoe transpolar potential model, which drives both Region-1 and Region-2 (with some delay) currents through the ionosphere. The ionospheric portion of the problem is treated in the manner of Nopper and Carovillano with Region-1 and Region-2 currents coupled as described by Siscoe(1982). Region-1 creates the eastward prompt electric field and Region-2 the shielding (westward) electric field at the dusk terminator. Preliminary results show that a detailed treatment in the neighborhood of the terminator leads to a local time dependence for the Region-1 produced prompt electric field which is very similar to the characteristic local time dependence seen in the vertical plasma drift at Jicamarca. ACE data allows continuous model comparison with the empirical model of Fejer and Scherliess, regarding the disturbance dynamo electric fields, which should allow determination of the relative contribution of the two processes.

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