<i>Letter to the Editor</i><br> Why do ultra-low-frequency MHD oscillations with a discrete spectrum exist in the magnetosphere?
A new concept of the global magnetospheric resonator is suggested for fast magnetosonic waves in which the role of the resonator is played by the near-Earth part of the plasma sheet. It is shown that the magnetosonic wave is confined in this region of the magnetosphere within its boundaries. The...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2005-03-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/23/1075/2005/angeo-23-1075-2005.pdf |
| Summary: | A new concept of the global magnetospheric resonator is suggested
for fast magnetosonic waves in which the role of the resonator is
played by the near-Earth part of the plasma sheet. It is shown
that the magnetosonic wave is confined in this region of the
magnetosphere within its boundaries. The representative value of
the resonator's eigenfrequency estimated at <i>f</i>~1MHz
is in good agreement with observational data of
ultra-low-frequency MHD oscillations of the magnetosphere with a
discrete spectrum (<i>f</i>~0.8, 1.3, 1.9, 2.6...MHz). The
theory explains the ground-based localization of the oscillations
observed in the midnight-morning sector of the high-latitude
magnetosphere. |
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| ISSN: | 0992-7689 1432-0576 |