Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51d1976p&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA51D-1976
Physics
[2722] Magnetospheric Physics / Forecasting, [2723] Magnetospheric Physics / Magnetic Reconnection, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions
Scientific paper
In this paper we investigate the role of different solar wind magnetosphere coupling functions on the Dst index calculated by the low order nonlinear dynamical WINDMI model. Previously we have shown that the two phase decay in the Dst index can be accounted for by including geotail current dynamics into the calculation. During that investigation we used the rectified solar wind electric field vxB_z as a baseline for the simulations and analysis. Here we include an evaluation of four other coupling functions, that together with the rectified vBs, fall into three categories. In the first category only vx and Bz are considered geoeffective. In the second category vx, Bz and By and solar wind dynamic pressure are considered geoeffective. In the third category we have the Borovsky coupling function in which only the solar wind dynamic pressure is considered to control reconnection rate and therefore determines geoeffectiveness. Our results indicate that for a majority of cases, at most only vx, By and Bz are needed to sufficiently account for the supply of energy to the ring current and geotail current components that contribute to the Dst index. The more complex coupling functions sometimes perform extremely well on storm datasets, but at other times do not reproduce the Dst index faithfully. The solar wind dynamic pressure contribution appears to be correctly accounted for through the calculation of the Dmp formula of tet{burton1975}. The degree to which the By component affects the Dst index is not entirely clear from our results, but in most cases it's inclusion slightly over-emphasizes the ring current contribution, and slightly under-emphasizes the geotail current contribution.
Horton Wendell
Kasturi P. M.
Mays Leila M.
Patra Sudhanwa
Spencer E. A.
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