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The steady or initial phase of the magnetic storms is

  • A.Preceded by storm sudden commencement
  • B.Magnetic storm at middle and low altitudes
  • C.A sharp increase of the field
  • D.None of the above

Answer: A

The initial phase of a magnetic storm is preceded by a storm sudden commencement - the abrupt jump in the horizontal field, lasting a few minutes, as the shock front of a solar wind gust compresses the magnetosphere.

The field then stays slightly elevated through the initial phase, before the main phase drives it sharply downward.

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