Magnetic noise bursts near the interplanetary shock associated with the coronal mass ejection event on February 21, 1994: The Geotail observations

Details Magnetic noise bursts near the interplanetary shock associated with the coronal mass ejection event on February 21, 1994: The Geotail observations Magnetic noise bursts near the interplanetary shock associated with the coronal mass ejection event on February 21, 1994: The Geotail observations

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10320561z&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A9, p. 20561-20580

Physics

Plasma Physics

2

Radio Science: Waves In Plasma, Solar Physics, Astrophysics, And Astronomy: Prominence Eruptions, Space Plasma Physics: Shock Waves, Space Plasma Physics: Waves And Instabilities

Scientific paper

A large coronal mass ejection (CME) event was detected by both the Geotail and IMP 8 satellites on February 21, 1994. Magnetic noise bursts (MNB) associated with the CME event are studied with the Geotail observations. An interplanetary shock associated with the CME reached the Geotail satellite, which was in the solar wind, around 0903 UT with a speed of about 1000 km/s. Before the arrival of the shock, the MNB with frequencies above 10 Hz are found to be produced by the whistler mode waves. These whistler mode waves propagate in a direction quasi-parallel to the ambient magnetic field (B0). After the arrival of the shock, the MNB are produced by two different kinds of waves. The first kind are whistler mode waves with frequencies from 10 Hz to about 200 Hz. The whistler mode waves propagate in a single direction nearly parallel to the ambient magnetic field. A stable ambient magnetic field is a necessary condition but not a sufficient condition for the detection of the whistler mode waves. These facts suggest that the sources of the whistler mode waves are in the nonlocal plasmas (such as the shock). The second are lower hybrid waves with frequencies around or less than the lower hybrid frequency. The lower hybrid waves mainly propagate in a direction nearly perpendicular to the ambient magnetic field. They are associated with a rapid change of B0. The large gradients in both the ambient magnetic field and the plasma density may trigger the lower hybrid drifting instability thus exciting the lower hybrid waves.

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