Wave characteristics of geomagnetic pulsations across the dip equator

M. Shinohara, K. Yumoto, N. Hosen, A. Yoshikawa, H. Tachihara, O. Saka, T. I. Kitamura

研究成果: Contribution to journalArticle査読

19 被引用数 (Scopus)

抄録

In order to clarify the wave characteristics of Pi2 and Pc 4-5 magnetic pulsations around the dip equator, we analyzed magnetic data from the latitudinally dense magnetometer array in Brazil. We found that the phase difference between Pi2 pulsations observed at globally separated low-latitude stations is small, whereas Pi2 pulsations observed within the dayside dip equator region of ±2° latitude show phase lags of about 30° ∼ 50° behind those in the off-dip equator region. Pc 4-5 magnetic pulsations at the dip equator also show the same phase character. Pi2 amplitudes are enhanced in the equatorial region, where the phase lags of pulsations must be associated with the enhancement of ionospheric conductivity. The equatorial phase lags can be explained by invoking the induction effect of the equatorial enhanced ionospheric current above the good conductor Earth.

本文言語英語
論文番号97JA03067
ページ(範囲)11745-11754
ページ数10
ジャーナルJournal of Geophysical Research: Space Physics
103
A6
出版ステータス出版済み - 1998

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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