Hydromagnetic waves associated with possible flux transfer events

Details Hydromagnetic waves associated with possible flux transfer events Hydromagnetic waves associated with possible flux transfer events

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.144..279l&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 144, no. 1-2, May 1988, p. 279-290.

Astronomy and Astrophysics

Astrophysics

17

Auroras, Earth Magnetosphere, Magnetic Flux, Magnetohydrodynamic Waves, Polar Cusps, Conducting Fluids, Daytime, Field Aligned Currents, Low Frequencies, Magnetic Field Reconnection

Scientific paper

Magnetic fluctuations in the hydromagnetic frequency band of about 0 to 0.05 Hz are examined at magnetospheric cusp latitudes during two times when ionospheric signatures of possible flux-tranfer events were evident in the data. Ultralow frequency power is found to be very broad band in the range of about 0.02-0.05 Hz and to be more narrowly confined at a frequency of about 0.0025 Hz. At lower latitudes, the higher frequency (broad-band) power excites narrower-band field line resonances at the fundamental frequency of the respective field line - a standing Alfven wave. The narrow-band power in the lower frequency band (period around 400 s) is approximately that expected for a field line resonance on a closed field line near the magnetopause; it also corresponds approximately to the width of the convected field-aligned current filament as observed on the ground. The reconnection process at the dayside magnetopause evidently plays an important role in the generation of low-frequency hydromagnetic energy in the dayside magnetosphere, energy which can produce Alfven waves deeper in the magnetosphere.

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