An Alfvén resonator or Ionosphere Alfvén resonator is a spectral resonance structure found within geomagnetic fields in the frequency range of 0.1–10 Hz. First reported in 1989, they are ionospheric short-period geomagnetic variations primarily seen as nighttime phenomena and rarely observed during the day. The nighttime preference is due to lower electrical conductivity in the ionospheric dynamo region, which enables the feedback instability.
See also
References
- Belyaev, P. P., Polyakov, C. V., Rapoport, V. O., & Trakhtengerts, V. Y. (1989). Experimental studies of the spectral resonance structure of the atmospheric electromagnetic noise background within the range of short-period geomagnetic pulsations. Radiophysics and Quantum Electronics, 32(6), 491-501.
- Nosé, M., Uyeshima, M., Kawai, J., & Hase, H. (2017). Ionospheric Alfvén resonator observed at low-latitude ground station, Muroto. Journal of Geophysical Research: Space Physics, 122(7), 7240-7255.
- Pokhotelov, D.; Lotko, W.; Sreltsov, A.V. (2002). "Harmonic structure of field line eigenmodes generated by ionospheric feedback instability". Journal of Geophysical Research: Space Physics. 107 (A11). doi:10.1029/2001JA000134.
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