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Magnetotail response to sudden changes in the interplanetary magnetic field

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The effect of southward or northward changes in the interplanetary magnetic field is examined statistically in the nightside magnetosphere over the range of 6.6 to 80R E from the Earth. After southward changes, the deformation of the magnetosphere toward a greater antisunward extension of field lines occurs at 6.6R E with ≲10 min delay and spreads down the tail to 80R E in ≲30 min. Around the onset of the field-line collapse that occurs 1–2 hr later, the southwarddirected field is observed briefly in the distant tail. The effect of northward changes could not be recognized in the lobe region of the tail.

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Nishida, A., Nagayama, N. Magnetotail response to sudden changes in the interplanetary magnetic field. Astrophys Space Sci 20, 459–472 (1973). https://doi.org/10.1007/BF00642215

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  • Magnetic Field
  • Field Line
  • Sudden Change
  • Interplanetary Magnetic Field
  • Lobe Region