Magnetic field of the transition current system: dawn-dusk asymmetryстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:In this paper we consider the interactions of coronal
mass ejections (CMEs) with the Earth’s magnetosphere
for the specific case in which there is a sharp increase in
the dynamic pressure (interplanetary shock) that is associated
with a simultaneous northward turning of the interplanetary
magnetic field (IMF) from the near horizontal direction.
Previously, we have shown that under such circumstances,
the so-called transition current systems arise. These temporary
high-latitude current systems create a low-latitude asymmetric
magnetic field on the ground with a large northward
field enhancement on the nightside and little or no field increase
near local noon. Here we investigate the dawn-dusk
asymmetry of the low-latitude on-ground magnetic field of
the transition current system caused by the IMF. Analysis
of the Region 1 current circuit for northward IMF shows a
change in its shape controlled by different IMF components.
Due to this geometrical effect, the maximum and minimum
magnetic field disturbances appear to be shifted. The obtained
results supplement and define more precisely the locations
of the magnetic disturbance extrema retrieved recently
by Clauer et al. (2001). The results of this study are compared
with the available observations. A good accordance is
demonstrated.