Propagation of the preliminary reverse impulse of sudden commencements to low latitudes

P. J. Chi, C. T. Russell, J. Raeder, E. Zesta, K. Yumoto, H. Kawano, K. Kitamura, S. M. Petrinec, V. Angelopoulos, G. Le, M. B. Moldwin

研究成果: ジャーナルへの寄稿学術誌査読

54 被引用数 (Scopus)


It has been thought that the preliminary reverse impulse (PRI) of the sudden commencements (SC) phenomena occurs simultaneously on the ground at different locations. A popular explanation is that the PRI propagates through the Earth-ionosphere waveguide at the 35 ground magnetometer stations during the SC event on September 24, 1998, and found clear differences in the arrival time of PRI. We calculated the MHD wave propagation time from the location of the first compression of the magnetosphere to the low-latitude ground stations and found good agreement with the observed PRI arrival times. Our calculation also indicates that the wavefront is seriously distorted by the inhomogeneity of the magnetosphere and the small difference in PRI arrival time between high-latitude and low-latitude observations cannot be an indicator of a super-Alfvenic propagation. We also found implications that high-latitude PRIs can be induced by the vortex of ionospheric currents at nearby latitudes, and the motion of the current vortex can affect the arrival time of high-latitude PRIs.

ジャーナルJournal of Geophysical Research: Space Physics
出版ステータス出版済み - 9月 1 2001

!!!All Science Journal Classification (ASJC) codes

  • 地球化学および岩石学
  • 地球物理学
  • 地球惑星科学(その他)
  • 宇宙惑星科学
  • 大気科学
  • 天文学と天体物理学
  • 海洋学


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