HR: 0800h
AN: SM51B-1287 [Abstracts]
TI: A Proposed SolarWind-Magnetosphere-Ionosphere Coupling Model
AU: * Rothwell, P L
EM: Paul.Rothwell@hanscom.af.mil
AF: Space Vehicles Directorate, Air Force Laboratory
, 29 Randolph Rd., Hanscom AFB, MA 01731
United States
AU: Jasperse, J R
SM51B-1287
AF: Space Vehicles Directorate, Air Force Laboratory
, 29 Randolph Rd., Hanscom AFB, MA 01731
United States
AB:
We combine three models to form a solar wind-magnetosphere-ionosphere model. According to the Hill-Siscoe [Hill et al., 1976;
Siscoe et al., 2002] (H-S) model, the solar wind at L1 determines the transpolar potential over the polar caps. These values
for the transpolar potential are shown to be consistent with the polar conductance predicted by the Nopper-Carovillano
[Nopper and Carovillano, 1978] ionospheric model labeled N-C. The results for the transpolar potential are also shown to be
in good agreement with both the Weimer[2005] model potential values and DMSP measurements for the 6-7 April 2000 magnetic
storm. The Region-1 (J1) and Region-2 (J2) currents are estimated from the Siscoe[1982] S-RC ring-current circuit model,
which is driven by the H-S transpolar potential. One can derive time-dependent solutions for J1 and J2 from this model with
the resistor values being estimated from the ionospheric conductance used in N-C. These solutions for J1 and J2 act as input
into N-C and the net penetration electric at equatorial latitudes is determined. Using this combined model we find that
shielding occurs within 1h of onset during the main phase of the 6-7 April 2000 storm. Equatorial plasma bubbles (EPBs) are
seen some ~ 1 h after the initial increase of the transpolar potential and are qualitatively consistent with the equatorial
penetration electric field calculated by the combined model.
Hill, T. W., A.J. Dessler,and R. A. Wolf, Geophys. Res. Lett., 3 (8), 1976.
Nopper, R. W., Jr., and R. L. Carovillano, J. Geophys. Res. , 84, (A11), 1979.
Siscoe et al.,J. Geophys. Res., 107, (A6), 2002.
Siscoe, George L., J. Geophys. Res., 87, (A7), 1982.
Weimer, D. R., J. Geophys. Res.,10.1029/2004JA010884,2005.
DE: 2164 Solar wind plasma
DE: 2447 Modeling and forecasting
DE: 2475 Polar cap ionosphere
DE: 2712 Electric fields (2411)
DE: 7949 Ionospheric storms (2441)
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005