On radiation belt dynamics during magnetic stormстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Abstract: Abstract
Temporal variations of the radiation belt particle during the magnetic storms are investigated using
measurements by the low altitude satellite spectrometer. Along with a several known effects, such as
the outer radiation belt intensity decrease at the main phase, the radial diffusion with the particle
acceleration and the recovery of the radiation belt during the recovery phase, some less known
features were investigated, such as the dawn-dusk asymmetry of the radiation belt.
During the main phase in the dusk sector an extension of the outer magnetic field lines into
magnetotail occurs, the electron flux previously measured in the outer radiation belt maximum
decreases to the polar cap level. All three adiabatic invariants remain conserved during this
transformation and as a consequence the radiation belt became adiabatically shifted to the lower
latitudes with addition of the nonadiabatic redial displacement.
During the main phase in the dawn sector the chain of the substorm dipolarizations is acting against
the tailward magnetic field line extension produced by the ring current and satellite registers an
enhanced particle flux in the quasitrapping region.
The adiabatic recovery of the inner radiation belt take place at the end of the magnetic storm again
with the addition of the nonadiabatic effects caused by the substorm activity.
It seems that a essential part of the radiation belt temporal dynamics during magnetic storms may be
explained by the change of the magnetic field configuration and the adiabatic effects. Together with
the nonadiabatic radial diffusion it results in the radial displacement of the outer radiation belt rather
than the large losses or total disappearance of the outer radiation belt.