Surface waves on the dawn magnetopause

Connection with ground PC 5 pulsations

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

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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 ≤XGSM≤ 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.

Original languageEnglish
Pages (from-to)1493-1502
Number of pages10
JournalAdvances in Space Research
Volume25
Issue number7-8
DOIs
Publication statusPublished - Jan 1 2000

Fingerprint

Magnetopause
magnetopause
Magnetosphere
Surface waves
surface wave
surface waves
magnetospheres
oscillation
magnetosphere
oscillations
magnetosheath
Spacecraft
spacecraft
Plasma flow
shear
Kelvin-Helmholtz instability
pressure pulses
equatorial regions
magnetohydrodynamic flow
Magnetic fields

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science

Cite this

Kokubun, S., Kawano, H., Mukai, T., Saito, Y., Tsuruda, K., Yamamoto, T., & Rostoker, G. (2000). Surface waves on the dawn magnetopause: Connection with ground PC 5 pulsations. Advances in Space Research, 25(7-8), 1493-1502. https://doi.org/10.1016/S0273-1177(99)00661-4

Surface waves on the dawn magnetopause : Connection with ground PC 5 pulsations. / Kokubun, S.; Kawano, Hideaki; Mukai, T.; Saito, Y.; Tsuruda, K.; Yamamoto, T.; Rostoker, G.

In: Advances in Space Research, Vol. 25, No. 7-8, 01.01.2000, p. 1493-1502.

Research output: Contribution to journalArticle

Kokubun, S, Kawano, H, Mukai, T, Saito, Y, Tsuruda, K, Yamamoto, T & Rostoker, G 2000, 'Surface waves on the dawn magnetopause: Connection with ground PC 5 pulsations', Advances in Space Research, vol. 25, no. 7-8, pp. 1493-1502. https://doi.org/10.1016/S0273-1177(99)00661-4
Kokubun, S. ; Kawano, Hideaki ; Mukai, T. ; Saito, Y. ; Tsuruda, K. ; Yamamoto, T. ; Rostoker, G. / Surface waves on the dawn magnetopause : Connection with ground PC 5 pulsations. In: Advances in Space Research. 2000 ; Vol. 25, No. 7-8. pp. 1493-1502.
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