SOLAR SPECTRAL IRRADIANCE VARIABILITY OF SOME CHROMOSPHERIC EMISSION LINES THROUGH THE SOLAR ACTIVITY CYCLES 21-23

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dc.contributor.authorGoker, U. D.
dc.contributor.authorGigolashvili, M. Sh.
dc.contributor.authorKapanadze, N.
dc.date.accessioned2024-09-11T19:52:50Z
dc.date.available2024-09-11T19:52:50Z
dc.date.issued2017
dc.departmentİstanbul Gelişim Üniversitesien_US
dc.description.abstractA study of variations of solar spectral irradiance (SSI) in the wavelength ranges 121.5 nm-300.5 nm for the period 1981-2009 is presented. We used various data for ultraviolet (UV) spectral lines and international sunspot number (ISSN) from interactive data centers such as SME (NSSDC), UARS (GDAAC), SORCE (LISIRD) and SIDC, respectively. We reduced these data by using the MATLAB software package. In this respect, we revealed negative correlations of intensities of UV (289.5 nm-300.5 nm) spectral lines originating in the solar chromosphere with the ISSN index during the unusually prolonged minimum between the solar activity cycles (SACs) 23 and 24. We also compared our results with the variations of solar activity indices obtained by the ground-based telescopes. Therefore, we found that plage regions decrease while facular areas are increasing in SAC 23. However, the decrease in plage regions is seen in small sunspot groups (SGs), contrary to this, these regions in large SGs are comparable to previous SACs or even larger as is also seen in facular areas. Nevertheless, negative correlations between ISSN and SSI data indicate that these variations are in close connection with the classes of sunspots/SGs, faculae and plage regions. Finally, we applied the time series analysis of spectral lines corresponding to the wavelengths 121.5 nm-300.5 nm and made comparisons with the ISSN data. We found an unexpected increase in the 298.5 nm line for the Fe II ion. The variability of Fe II ion 298.5 nm line is in close connection with the facular areas and plage regions, and the sizes of these solar surface indices play an important role for the SSI variability, as well. So, we compared the connection between the sizes of faculae and plage regions, sunspots/SGs, chemical elements and SSI variability. Our future work will be the theoretical study of this connection and developing of a corresponding model.en_US
dc.description.sponsorshipBAP (Bogazici University Scientific Research Project) [8563]; Istanbul Gelisim University; TUBITAK (Scientific and Technological Research Council of Turkey)en_US
dc.description.sponsorshipThe authors would like to thank the members of SME, UARS and SORCE teams, and data center at Laboratory for Atmospheric and Space Physics, University of Colorado in Boulder; Solar Influences Data Analysis Center, World Data Center for the Sunspot Index at the Royal Observatory of Belgium; National Space Science Data Center, Goddard Distributed Active Archive Center and NOAA National Geophysical Data Center for making spectral irradiance data and solar activity proxies accessible for obtaining and further processing; and BAP (Bogazici University Scientific Research Project, Project No: 8563), Istanbul Gelisim University and TUBITAK (The Scientific and Technological Research Council of Turkey) for their financial support.en_US
dc.identifier.doi10.2298/SAJ160126001G
dc.identifier.endpage86en_US
dc.identifier.issn1450-698X
dc.identifier.issn1820-9289
dc.identifier.scopus2-s2.0-85021991470en_US
dc.identifier.startpage71en_US
dc.identifier.urihttps://doi.org/10.2298/SAJ160126001G
dc.identifier.urihttps://hdl.handle.net/11363/8035
dc.identifier.volume194en_US
dc.identifier.wosWOS:000406953600006en_US
dc.identifier.wosqualityQ4en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.language.isoenen_US
dc.publisherAstronomical Observatory Belgradeen_US
dc.relation.ispartofSerbian Astronomical Journalen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.snmz20240903_Gen_US
dc.subjectMethods: data analysisen_US
dc.subjectSun: chromosphereen_US
dc.subjectSun: UV radiationen_US
dc.titleSOLAR SPECTRAL IRRADIANCE VARIABILITY OF SOME CHROMOSPHERIC EMISSION LINES THROUGH THE SOLAR ACTIVITY CYCLES 21-23en_US
dc.typeArticleen_US

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