Behaviour of electron content in the ionospheric d-region during solar x-ray flares
| Autor: | Jovan Bajčetić, Aleksandra Nina, Dragan Blagojević, Luka Č. Popović, V. M. Cadez, Miljana Todorović-Drakul |
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| Rok vydání: | 2016 |
| Předmět: |
Sun: flares
lcsh:Astronomy 0211 other engineering and technologies FOS: Physical sciences 02 engineering and technology D region Electron Astrophysics 01 natural sciences lcsh:QB1-991 Sun: activity 0103 physical sciences activity [Sun] 010303 astronomy & astrophysics 021101 geological & geomatics engineering Earth and Planetary Astrophysics (astro-ph.EP) Physics Solar flare Gamma ray X-ray Astronomy and Astrophysics solar-terrestrial relations gamma rays flares [Sun] Content (measure theory) Physics::Space Physics Ionosphere X-rays gamma rays [Sun] Sun: X-rays Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Serbian Astronomical Journal Serbian Astronomical Journal, Vol 2016, Iss 193, Pp 11-18 (2016) |
| Popis: | One of the most important parameters in ionospheric plasma research, also having a wide practical application in wireless satellite telecommunications, is the total electron content (TEC) representing the columnal electron number density. The F-region with high electron density provides the biggest contribution to TEC while the relatively weakly ionized plasma of the D-region (60 km { 90 km above Earth's surface) is often considered as a negligible cause of satellite signal disturbances. However, sudden intensive ionization processes, like those induced by solar X-ray flares, can cause relative increases of electron density that are significantly larger in the D-region than in regions at higher altitudes. Therefore, one cannot exclude a priori the D-region from investigations of ionospheric influences on propagation of electromagnetic signals emitted by satellites. We discuss here this problem which has not been sufficiently treated in literature so far. The obtained results are based on data collected from the D-region monitoring by very low frequency radio waves and on vertical TEC calculations from the Global Navigation Satellite System (GNSS) signal analyses, and they show noticeable variations in the D-region's electron content (TECD) during activity of a solar X-ray °are (it rises by a factor of 136 in the considered case) when TECD contribution to TEC can reach several percent and which cannot be neglected in practical applications like global positioning procedures by satellites. [Projekat Ministarstva nauke Republike Srbije, br. III-44002, 176001, 176002, 176004 and TR36020] |
| Databáze: | OpenAIRE |
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