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Evolution of the Subauroral Polarization Stream Oscillations During the Severe Geomagnetic Storm on 20 November 2003
Author(s) -
He Fei,
Zhang XiaoXin,
Wang Wenbin,
Pu ZuYin,
Zong QiuGang,
Yao Zhonghua,
Wei Yong,
Ren ZhiPeng,
Yue Xinan,
Liu Libo,
Wan Weixing
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl081446
Subject(s) - plasma sheet , geomagnetic storm , plasmasphere , geophysics , substorm , ionosphere , plasma , interplanetary magnetic field , storm , atmospheric sciences , convection , magnetosphere , geology , physics , solar wind , meteorology , quantum mechanics
We report multisatellite observations of the oscillations in the subauroral polarization stream (SAPS) during a severe magnetic storm on 20 November 2003. The SAPS oscillations (SAPSOs) occurred during the main phase of the magnetic storm when the y component of the southward interplanetary magnetic field (IMF B Y ) turned from positive to negative. The SAPSOs were first observed in the premidnight sector and propagated toward the dusk sector. The formation and evolution of SAPSO corresponded well with the plasma sheet ions injection and precipitation, indicating that the SAPSOs are possibly generated by the interaction between the hot plasma sheet and the cold plasmasphere under particular conditions (e.g., change of the polarity of IMF B Y accompanied with a sudden enhancement of plasma sheet ion density). The hemispheric asymmetry of the SAPS channels is suggested to be related to the hemispheric differences in the ionospheric plasma condition and the ionospheric convection.