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Explicit IMF By-Dependence in Geomagnetic Activity: Quantifying Ionospheric Electrodynamics
Geomagnetic activity is mainly driven by the southward (Bz) component of the interplanetary magnetic field (IMF), which dominates all solar wind coupling functions. Coupling functions also depend on the absolute value of the dawn-dusk (By) component of the IMF, but not on its sign. However, recent studies have shown that for a fixed level of solar wind driving, auroral electrojets in the Northern Hemisphere (NH) are stronger for By \textgreater 0 than for By \textless 0 during NH winter. In NH summer, the dependence on the B ...
Holappa, L.; Robinson, R.; Pulkkinen, A.; Asikainen, T.; Mursula, K.;
Published by: Journal of Geophysical Research: Space Physics Published on:
YEAR: 2021   DOI: 10.1029/2021JA029202
space weather; magnetosphere-ionosphere coupling; field-aligned currents; geomagnetic activity