Global sawtooth oscillations of the magnetosphere
Article first published online: 3 JUN 2011
©2004. American Geophysical Union. All Rights Reserved.
Eos, Transactions American Geophysical Union
Volume 85, Issue 49, page 525, 7 December 2004
How to Cite
2004), Global sawtooth oscillations of the magnetosphere, Eos Trans. AGU, 85(49), 525–525, doi:10.1029/2004EO490009.(
- Issue published online: 3 JUN 2011
- Article first published online: 3 JUN 2011
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Global sawtooth oscillations are periodic changes in the morphology of the magnetosphere wherein the magnetic field in the inner regions strongly stretches and then rapidly crashes or dipolarizes. The period of the oscillation is about three hours, with the crash phase lasting 5–15 min. At geosynchronous orbit, a sawtooth oscillation of the magnetosphere appears as a periodic decline and rapid recovery of the energetic particle fluxes at all local times; such an oscillation is shown in Figure 1.
Global sawtooth oscillations occur during some, but not all, geomagnetic storms. Owing to the extremely large amplitudes of the sawtooth oscillations, nearly all measurements taken in the magnetosphere show signatures of the sawtooth oscillations.