Temporal evolutions of the solar wind conditions at 1 AU prior to the near-Earth X lines in the tail: Superposed epoch analysis - Archive ouverte HAL Access content directly
Journal Articles Journal of Geophysical Research: Space Physics Year : 2016

Temporal evolutions of the solar wind conditions at 1 AU prior to the near-Earth X lines in the tail: Superposed epoch analysis

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L. Q. Zhang
  • Function : Author
L. Dai
  • Function : Author
W. Baumjohann
A. T. Y. Lui
  • Function : Author
C. Wang
M. W. Dunlop
  • Function : Author

Abstract

Utilizing conjunction observations of the Geotail and ACE satellites from 1998 to 2005, we investigated the temporal evolutions of the solar wind conditions prior to the formation of X lines in the near-Earth magnetotail. We first show the statistical properties of Bz, By, density, and velocity of the solar wind related to the 374 tail X line events. A superposed epoch analysis is performed to study the temporal evolutions of the solar wind conditions 5 h prior to the tail X lines. The solar wind conditions for tail X lines during southward interplanetary magnetic field (IMF) (SW-IMF) and northward IMF (NW-IMF) are analyzed. The main results are as follows: (1) For events classified as SW-IMF, near-Earth X line observations in the magnetosphere are preceded by ~2 h intervals of southward IMF; (2) for events classified as NW-IMF, the northward IMF orientation preceding near-Earth X line observations lasts ~ 40 min.
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insu-03669450 , version 1 (17-05-2022)

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L. Q. Zhang, L. Dai, W. Baumjohann, A. T. Y. Lui, C. Wang, et al.. Temporal evolutions of the solar wind conditions at 1 AU prior to the near-Earth X lines in the tail: Superposed epoch analysis. Journal of Geophysical Research: Space Physics, 2016, 121, pp.7488-7496. ⟨10.1002/2016JA022687⟩. ⟨insu-03669450⟩
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