Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh52a..16t&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH52A-16
Physics
2475 Polar Cap Ionosphere, 2788 Storms And Substorms, 2447 Modeling And Forecasting, 2463 Plasma Convection
Scientific paper
High-latitude ionospheric potentials are dramatically changed by IMF variations and with substorm development. In this study, potential maps have been derived which cover their change. These have been calculated as functions of IMF and solar wind speed, by statistical analysis of electric potential data for more than 2600 passes of DE 2, using a data interpolation technique with spline. Our model for substorm conditions shows that early in the expansion phase, the positive potential that usually occurs in the postmidnight sector, starts to enter the poleward side of the negative premidnight potential, leading to the development of a distorted pattern. At the substorm maximum, the negative premidnight potential occurs at higher latitudes than in earlier stages, leading to a pronounced Harang discontinuity. Following the substorm maximum, the positive potential gradually retreats from the premidnight potential, and the negative premidnight potential also begins to return to lower latitudes. In the final stage of the recovery phase, the negative premidnight potential extends to the equatorward side of the positive potential, which returns to its initial position. For nonsubstorm conditions, our model shows some features that are not identified in previous empirical models. A reverse convection pattern exists on the dayside even for small ( ~2 nT) northward IMF, and the potential becomes large with the increase of the IMF. When IMF |By| becomes equal to or larger than Bz during northward IMF, a potential structure appears near midnight, which is enhanced with the increase of the IMF magnitude. Details of relations of the potential variations with IMF, which are used in the model construction, will be presented, and possibility of the prediction of potential maps for extremely large IMF with the extrapolation of these relations will be also discussed.
Nishimura Harumichi
Taguchi Satoshi
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