The ionospheric Alfv/'en resonator |
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| Affiliation: | 1. Radiophysical Research Institute, Gorky, U.S.S.R.;2. Institute of Applied Physics, Academy of Sciences of the U.S.S.R., 46 Uljanov Street, 603600 Gorky, U.S.S.R.;1. Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 2, 00185 Roma, Italy;2. Physics Department, Princeton University, Washington Road, 08544 Princeton, NJ, USA;3. INFN – Sezione di Roma, Piazzale Aldo Moro 2, 00185 Roma, Italy;4. Istituto di Fotonica e Nanotecnologie – CNR, Via Cineto Romano 42, 00156 Roma, Italy;5. INFN – Laboratori Nazionali del Gran Sasso, Assergi (L''Aquila) 67010, Italy;6. INFN – Sezione di Genova, Via Dodecaneso 33, 16146 Genova, Italy;7. Dipartimento di Fisica, Università degli Studi di Genova, Via Dodecaneso 33, 16146 Genova, Italy;8. Laboratorio de Fisica Nuclear y Astroparticulas, Universidad de Zaragoza, Zaragoza 50009, Spain |
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| Abstract: | The ionospheric Alfvén resonator (IAR) associated with peculiarities of the plasma distribution in the F-region ionosphere affects significantly the spectral form of electromagnetic noise registered on the Earth's surface and by satellites. The eigenfrequencies of the IAR are in the range from 0.1 to 10 Hz, and the Q-factor is ~ 10. This is proved experimentally by the spectral resonance structure (SRS), excited by lightning, which manifests itself as pronounced minima and maxima in the averaged spectral intensity of atmospheric background noise of a few hertz. A theory for the SRS is constructed which explains the main experimental facts. New ground-based diagnostics of the electron density profile above the F-layer maximum derived from SRS data are discussed. |
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