Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa33b1331r&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA33B-1331
Physics
2409 Current Systems (2721), 2437 Ionospheric Dynamics, 2441 Ionospheric Storms (7949), 2499 General Or Miscellaneous
Scientific paper
In an earlier work [Rothwell and Jasperse, 2006] we derived the global ionospheric electric field produced by the Region-1 and Region-2 currents. Despite the simplifying assumptions in that work of both the dipole and spin axis being aligned perpendicular to the ecliptic plane we found promising agreement with Jicamarca vertical drift data. However, in order to extend the model to arbitrary geographic locations we now take into account 1) the tilt of the magnetic dipole, as well as local IGRF modifications in the B-field, 2) a seasonal, solar-driven ionospheric conductance model which is accurate near the terminators, and 3) the Region-1 and Region-2 currents properly defined in magnetic coordinates. For example, the Region-1 and-2 currents are fixed in the inertial frame so that at a given geographic location there is a daily variation in the ionospheric electric field due to this effect. As in the previous work, Region-1 and Region-2 currents are related, using the Hill-Siscoe transpolar potential model, to the solar wind data as measured at L1 by the ACE satellite. In this way, we intend to build a useful Space Weather Forecasting tool by which the time-dependent, solar-driven ionospheric electric field is defined at any geographic location. Rothwell, P. L., and J. R. Jasperse(2006) Modeling the connection of the global ionospheric electric fields to the solar wind, J. Geophys. Res., 111, A3211, Doi:10.1029/2004JA010992.
Grossbard Neil J.
Jasperse John R.
Rothwell Paul L.
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