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Hydromagnetic waves associated with possible flux transfer events

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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.

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Authors and Affiliations

  1. AT&T Bell Laboratories, Murray Hill, New Jersey, USA

    L. J. Lanzerotti & C. G. Maclennan

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  1. L. J. Lanzerotti
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  2. C. G. Maclennan
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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. Hydromagnetic waves associated with possible flux transfer events. Astrophys Space Sci 144, 279–290 (1988). https://doi.org/10.1007/BF00793185

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  • DOI: https://doi.org/10.1007/BF00793185

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