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The chain response of the magnetospheric and ground magnetic field to interplanetary shocks
Author(s) -
Sun T. R.,
Wang C.,
Zhang J. J.,
Pilipenko V. A.,
Wang Y.,
Wang J. Y.
Publication year - 2015
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2014ja020754
Subject(s) - physics , interplanetary magnetic field , magnetosphere , magnetopause , magnetic field , ionosphere , geophysics , ionospheric dynamo region , interplanetary spaceflight , impulse (physics) , magnetohydrodynamics , computational physics , solar wind , classical mechanics , quantum mechanics
In response to interplanetary (IP) shocks, magnetic field may decrease/increase (negative/positive response) in nightside magnetosphere, while at high latitudes on the ground it has two‐phase bipolar variations: preliminary impulse and main impulse (MI). Using global MHD simulations, we investigate the linkage between the MI phase variation on the ground and the magnetospheric negative response to an IP shock. It is revealed that although the two phenomena occur at largely separated locations, they are physically related and form a response chain. The velocity disturbances near the flanks of the magnetopause cause the magnetic field to decrease, resulting in a dynamo which thus powers the transient field‐aligned currents (FACs). These FACs further generate a pair of ionospheric current vortex, leading to MI variations on the ground. Therefore, we report here the intrinsic physically related chain response of the magnetospheric and ground magnetic field to IP shocks, and thus link the magnetospheric sudden impulse (SI) and ground SI together.