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Polar cap electric field dependence on solar wind and magnetotail parameters
Author(s) -
Longenecker D.,
Roederer J. G.
Publication year - 1981
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl008i012p01261
Subject(s) - polar , interplanetary magnetic field , geophysics , convection , electric field , physics , solar wind , dipole , polar cap , magnetosphere , flux (metallurgy) , intensity (physics) , geology , magnetic field , atmospheric sciences , ionosphere , mechanics , astronomy , optics , materials science , quantum mechanics , metallurgy
A magnetic field model with a linearly superposed uniform external field is used to study the effects of the magnetotail field intensity B T on the relationship between the convection pattern in the polar cap and the interplanetary magnetic field (IMF). It is found that as B T increases, the polar cap size increases, the overall electric field intensity decreases, and the dependence of the total "open" flux on the magnitude and direction of the IMF weakens. In addition, the tail field introduces significant differences between the convection patterns corresponding to "toward" and "away" IMF sectors, respectively: in the northern (southern) polar cap, features such as polar cap boundary displacements and electric field intensity gradients are more pronounced when the earth is in an "away" ("toward") sector. On the other hand, in the case of a northward‐tilted IMF, sunward convection in the north (south) polar cap is extended over a larger area for a "toward" ("away") sector. Since dipole tilt was not taken into account in the model, these results should mainly apply to periods around equinox.