Occurrence of Magnetospheric Flux Transfer Events During Substorm

  1. Joseph R. Kan,
  2. Thomas A. Potemra,
  3. Susumu Kokubun and
  4. Takesi Iijima
  1. Hideaki Kawano and
  2. Susumu Kokubun

Published Online: 19 MAR 2013

DOI: 10.1029/GM064p0409

Magnetospheric Substorms

Magnetospheric Substorms

How to Cite

Kawano, H. and Kokubun, S. (1991) Occurrence of Magnetospheric Flux Transfer Events During Substorm, in Magnetospheric Substorms (eds J. R. Kan, T. A. Potemra, S. Kokubun and T. Iijima), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM064p0409

Author Information

  1. Department of Earth and Planetary Physics, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan

Publication History

  1. Published Online: 19 MAR 2013
  2. Published Print: 1 JAN 1991

ISBN Information

Print ISBN: 9780875900308

Online ISBN: 9781118663981



  • Magnetospheric substorms—Congresses


Transient variations in the magnetic field and plasma parameters, called flux transfer events (FTEs), have been detected in the magnetosheath and the magnetosphere near the magnetopause. FTEs have been interpreted to be generated by transient and patchy reconnection.

In this report, four series of recurring transient magnetic field variations identifiable as FTEs, observed with AMPTE/CCE in the outer magnetosphere, are studied in relation to substorm activities. Since AMPTE/CCE resides in the region of 8<L<9 for about 6 hours on each orbit, the spacecraft can continuously monitor the time-sequence of the events occurring near the magnetopause.

It is found that the transient variations are observed during the substorm growth phase and continue to occur during the substorm expansion phase until the spacecraft enters themagnetosheath. This time-sequence can be interpreted as follows: the southward turning of the interplanetary magnetic field starts the dayside merging, which generates FTEs near the dayside magnetosphere and initiates the growth phase of substorm in the magnetosphere.