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dc.creatorTodorović-Drakul, Miljana
dc.creatorCadez, V.M.
dc.creatorBajcetić, J.
dc.creatorPopović, L. C.
dc.creatorBlagojević, Dragan
dc.creatorNina, A.
dc.date.accessioned2019-04-19T14:24:52Z
dc.date.available2019-04-19T14:24:52Z
dc.date.issued2016
dc.identifier.issn1450-698X
dc.identifier.urihttp://grafar.grf.bg.ac.rs/handle/123456789/736
dc.description.abstractOne 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 flare (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.en
dc.publisherAstronomska opservatorija, Beograd i Univerzitet u Beogradu - Matematički fakultet - Odeljenje za astronomiju, Beograd
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/44002/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/176001/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/176002/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/176004/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Technological Development (TD or TR)/36020/RS//
dc.rightsopenAccess
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.sourceSerbian Astronomical Journal
dc.subjectsolar-terrestrial relationsen
dc.subjectSun: activityen
dc.subjectSun: flaresen
dc.subjectSun: X-rays, gamma raysen
dc.titleBehaviour of electron content in the ionospheric d-region during solar x-ray flaresen
dc.typearticle
dc.rights.licenseBY-NC-ND
dc.citation.epage18
dc.citation.other193: 11-18
dc.citation.rankM23
dc.citation.spage11
dc.citation.volume193
dc.identifier.doi10.2298/SAJ160404006T
dc.identifier.fulltexthttp://grafar.grf.bg.ac.rs//bitstream/id/4134/734.pdf
dc.identifier.rcubconv_1866
dc.identifier.scopus2-s2.0-85009736750
dc.identifier.wos000392955400002
dc.type.versionpublishedVersion


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