Spectral characteristics of ionospheric scintillations of VHF radiosignal near magnetic zenith
| Autor: | Andrey Medvedev, Mariia Globa, Roman Vasilyev, D. S. Kushnarev, Konstantin Ratovsky |
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| Rok vydání: | 2017 |
| Předmět: |
Geomagnetic storm
Physics Atmospheric Science Ionospheric dynamo region Scintillation 010504 meteorology & atmospheric sciences Incoherent scatter Geophysics 01 natural sciences Physics::Geophysics Computational physics Earth's magnetic field Space and Planetary Science Physics::Space Physics 0103 physical sciences Ionospheric heater Ionosphere 010303 astronomy & astrophysics Zenith 0105 earth and related environmental sciences |
| Zdroj: | Journal of Atmospheric and Solar-Terrestrial Physics. 160:48-55 |
| ISSN: | 1364-6826 |
| DOI: | 10.1016/j.jastp.2017.05.016 |
| Popis: | We present the results of observing the Cygnus-A radio source scintillation in the Earth's ionosphere under quiet and disturbed geomagnetic conditions by using the Irkutsk incoherent scattering radar (IISR). The scintillation method applied for ionosphere testing at IISR confidently determines the Fresnel frequency and power cutoff, the spectral characteristics usually related to the velocities and spatial spectra of ionospheric plasma irregularities. We also use the IGRF magnetic field model to show the relation between the shape of discrete radio source scintillation spectra and the direction to the radio source with respect to the geomagnetic field. The S4 index increase within the magnetic zenith is observed to be conditioned by the scintillation spectrum widening. We also evaluate the zonal velocity of observed ionospheric irregularities as ∼10 m/sec assuming the irregularity height to be equal to the F2-layer maximum height in the ionosphere. |
| Databáze: | OpenAIRE |
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