Sensing the Earth's low ionosphere during solar flares using VLF signals and GOES X-ray data
| Autor: | Davorka Grubor, Aleksandra Kolarski |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Atmospheric Science
Electron density 010504 meteorology & atmospheric sciences Meteorology Wave propagation Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Aerospace Engineering Astrophysics 01 natural sciences law.invention Physics::Geophysics law 0103 physical sciences Coronal mass ejection Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics 0105 earth and related environmental sciences Earth and Planetary Astrophysics (astro-ph.EP) Physics Solar flare Astronomy and Astrophysics Geophysics Amplitude Space and Planetary Science Physics::Space Physics General Earth and Planetary Sciences Earth–ionosphere waveguide Ionosphere Flare Astrophysics - Earth and Planetary Astrophysics |
| Popis: | An analysis of D-region electron density height profile variations, induced by four isolated solar X-ray flares during period from September 2005 to December 2006, based on the amplitude and the phase delay perturbation of 22.1 kHz signal trace from Skelton (54.72 N, 2.88 W) to Belgrade (44.85 N, 20.38 E), coded GQD, was carried out. Solar flare data were taken from NOAA GOES12 satellite one-minute listings. For VLF data acquisition and recordings at the Institute of Physics, Belgrade, Serbia, the AbsPAL system was used. Starting from LWPCv21 code (Ferguson, 1998), the variations of the Earth-ionosphere waveguide characteristic parameters, sharpness and reflection height, were estimated during the flare conditions. It was found that solar flare events affected the VLF wave propagation in the Earth-ionosphere waveguide by changing the lower ionosphere electron density height profile, in a different way, for different solar flare events. 23 pages, 9 figures, 3 tables |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|