Possible evidence of virtual resonance in the dayside magnetosphere

Details Possible evidence of virtual resonance in the dayside magnetosphere Possible evidence of virtual resonance in the dayside magnetosphere

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11405206t&link_type=abstract

Journal of Geophysical Research, Volume 114, Issue A5, CiteID A05206

Physics

2

Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836), Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934)

Scientific paper

On day 108, 2001, the Sub-Auroral Magnetometer Network (SAMNET) and Magnetometers along the Eastern Atlantic Seaboard for Undergraduate Research and Education (MEASURE) magnetometer arrays detected dayside magnetic pulsations at a common frequency of ˜15 mHz at all locations below L = 4. This global pulsation event was associated with alignment of the interplanetary magnetic field with the Sun-Earth axis, a condition known to generate ultralow-frequency (ULF) waves in front of the bow shock. The event occurred during the early recovery phase of a geomagnetic storm. Magnetic field measured by the GOES 8 geostationary satellite on the dayside indicated elevated broadband (7-80 mHz) ULF power in the compressional component without a strong peak at 15 mHz. These observations suggest that the global pulsations originated from a compressional magnetohydrodynamic eigenmode oscillation of the inner magnetosphere stimulated by a broadband external disturbance. The equatorial Alfvén velocity corresponding to the toroidal frequencies that were determined with the cross-phase analysis of SAMNET and MEASURE data showed a gradual decrease of the velocity with L without a clear signature of a plasmapause. The observed properties of the global pulsations are consistent with virtual resonance in the inner magnetosphere.

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