Surface waves on the dawn magnetopause: Connection with ground PC 5 pulsations

S. Kokubun, H. Kawano, T. Mukai, Y. Saito, K. Tsuruda, T. Yamamoto, G. Rostoker

研究成果: Contribution to journalArticle査読

8 被引用数 (Scopus)

抄録

Observations of the Geotail spacecraft show that ion flow oscillations in the PC 5 frequency range are fairly common at the equatorial region in the dawn magnetosphere (-5 ≤X GSM ≤ 5). The amplitudes of these oscillations sometimes exceed 250 km/s. We examined in detail several events associated with temporal magnetopause crossings during the course of oscillations. It is found that plasma flow oscillations near the magnetopause correspond closely with magnetic field pulsations at latitudes of 70 - 75 degrees on the ground, although the form of the flow oscillation is spiky rather than sinusoidal. The boundary normal inclines sunward (tailward), when the spacecraft enters the magnetosheath (magnetosphere). Most of magnetopause crossings analyzed are cases with high magnetic shears (Bz in the magnetopause was negative in most cases). Outward and sunward flows, whose magnitudes are greater than those in the magnetosheath, were observed in the magnetosphere after inbound crossings, while inward and tailward flows were detected before outbound crossings. These characteristics are not necessarily consistent with the excitation of surface waves by the Kelvin-Helmholtz instability. A high-speed flow with the sunward and outward component was also observed in the magnetosphere after the inbound crossing with high magnetic shear in an isolated and temporal magnetopause crossing event driven by a pressure pulse.

本文言語英語
ページ(範囲)1493-1502
ページ数10
ジャーナルAdvances in Space Research
25
7-8
DOI
出版ステータス出版済み - 2000

All Science Journal Classification (ASJC) codes

  • 航空宇宙工学
  • 天文学と天体物理学
  • 地球物理学
  • 大気科学
  • 宇宙惑星科学
  • 地球惑星科学(全般)

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