Abstract
Magnetic fluctuations in the hydromagnetic frequency band ~ 0 to ~ 0.05 Hz are examined at magnetospheric cusp latitudes during two times when ionospheric signatures of possible flux-transfer events were evident in the data. Ultralow frequency power is found to be very broad band in the range ~ 0.02–0.05 Hz and to be more narrowly confined at a frequency ~ 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 Alfvén 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 (≲, 0.008 Hz) hydromagnetic energy in the dayside magnetosphere, energy which can produce Alfvén waves deeper in the magnetosphere.
Paper dedicated to Professor Hannes Alfvén on the occasion of his 80th birthday, 30 May 1988.
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Lanzerotti, L.J., Maclennan, C.G. (1988). Hydromagnetic Waves Associated with Possible Flux Transfer Events. In: Fälthammar, CG., Arrhenius, G., De, B.R., Herlofson, N., Mendis, D.A., Kopal, Z. (eds) Plasma and the Universe. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3021-6_18
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DOI: https://doi.org/10.1007/978-94-009-3021-6_18
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