Diagnostics of the Solar X-Flare Impact on Lower Ionosphere through the VLF-NAA Signal Recordings
Autor: | Aleksandra Kolarski, Davorka Grubor, D. M. Šulić |
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Rok vydání: | 2011 |
Předmět: |
Physics
earth ionosphere waveguide solar flares Astronomy Astrophysics::High Energy Astrophysical Phenomena QB1-991 Astronomy and Astrophysics Signal Physics::Geophysics law.invention vlf signal perturbation Space and Planetary Science law Physics::Space Physics Astrophysics::Solar and Stellar Astrophysics Ionosphere Remote sensing Flare |
Zdroj: | Open Astronomy, Vol 20, Iss 4, Pp 591-595 (2011) |
ISSN: | 2543-6376 |
DOI: | 10.1515/astro-2017-0342 |
Popis: | An analysis of four solar flare X-ray irradiance effects on VLF signal amplitude and phase delay variations on the NAA/24.0 kHz signal trace during the period from 2005 September to 2006 December was carried out. Solar flare data were taken from the GOES12 satellite one-minute listings. For the VLF data, recordings at the Institute of Physics, Belgrade were used. It was found that solar flare events affect VLF wave propagation in the Earth-ionosphere waveguide lowering the changes of the ionosphere electron density height profiles. This follows from the variation during the solar flare events of the following propagation parameters: the sharpness of the lower edge of the ionosphere and the reflection height. |
Databáze: | OpenAIRE |
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