Field-Line Draping Around ICMES |
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Authors: | Zerefşan Kaymaz George Siscoe |
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Institution: | (1) Faculty of Aeronautics and Astronautics, Istanbul Technical University, Istanbul, Turkey;(2) Center for Space Physics, Boston University, Boston, MA, 02215, U.S.A. |
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Abstract: | Magnetic field orientations in the sheaths of ten fast interplanetary coronal mass ejections (ICMEs) that cover the solar
longitude range roughly from 20° East to 33° West (as determined from the associated flare or filament disruption) are overlain
on the MHD-computed magnetic field pattern showing draping in Earth’s magnetosheath. The general draping pattern is evident
in the ICME sheath orientations including, most importantly, the east flank where draping causes the greatest distortion of
the magnetic field away from the general Parker spiral. Deviations from the general draping pattern are also evident which,
we suggest, result from the history of accretion of the inhomogeneous interplanetary magnetic field (IMF) into the ICME sheath
over a long stretch of solar wind before arriving at one AU. The profiles of magnetic field intensity between the ICME shock
and the nose of the ICME deviate significantly from the corresponding profile in Earth’s magnetosheath. The ICME samples are
much more irregular and show no general tendency to increase toward the stagnation point. We suggest that again this difference
reflects the history of IMF accretion by the ICME sheath. The long stretch of accreted inhomogeneous field (a significant
fraction of one AU) can account for the irregularity, and the weakness of the field close to the body possibly reflects a
weaker ICME shock closer to the Sun. |
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