Toroidal standing waves excited by a storm sudden commencement - DE 1 observations

Details Toroidal standing waves excited by a storm sudden commencement - DE 1 observations Toroidal standing waves excited by a storm sudden commencement - DE 1 observations

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.7857c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, June 1, 1990, p. 7857-7867.

Physics

8

Magnetic Storms, Magnetospheric Instability, Standing Waves, Sudden Storm Commencements, Dynamics Explorer Satellites, Electric Fields, Geomagnetic Pulsations, Magnetic Fields, Toroids

Scientific paper

A 74-nT sudden commencement on July 13, 1982, was observed in the magnetosphere, with instruments on the Dynamics Explorer 1 satellite. Inbound, near L = 4.5, the satellite was located at 1524 magnetic local time and 20 deg magnetic latitude. The sudden commmencement established a strong, east-west oscillation, with 100-s period, which was observed in the magnetic field, the electric field, and the plasma flow velocity records. There was also a compressional component of this 100-s oscillation and a rapidly damped 300-s compressional pulsation. The compressional oscillations may be an evidence of cavity resonances, excited by the sudden commencement. The cavity waves may, in turn, couple to toroidal waves in field line resonance at the satellite location. In addition, the sudden commencement caused the onset of waves with frequencies from 0.1 up to at least 0.5 Hz. The observations are compared with similar reports from earlier pulsations related to sudden commencements.

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