Comparative analysis of extreme ultraviolet solar radiation proxies during minimum activity levels
Four extreme ultraviolet (EUV) solar radiation proxies (Magnesium II core-to-wing ratio (MgII), Lyman α flux (Fα), 10.7-cm solar radio flux (F10.7), and sunspot number (Rz)) were analyzed during the last four consecutive solar activity minima to investigate how they differ during minimum periods and...
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| Format: | Article |
| Language: | English |
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Science Press
2023-09-01
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| Series: | Earth and Planetary Physics |
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| Online Access: | http://www.eppcgs.org/article/doi/10.26464/epp2023050?pageType=en |
| _version_ | 1797692529951375360 |
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| author | A. G. Elias C. R. Martinis B. F. de Haro Barbas F. D. Medina B. S. Zossi M. Fagre T. Duran |
| author_facet | A. G. Elias C. R. Martinis B. F. de Haro Barbas F. D. Medina B. S. Zossi M. Fagre T. Duran |
| author_sort | A. G. Elias |
| collection | DOAJ |
| description | Four extreme ultraviolet (EUV) solar radiation proxies (Magnesium II core-to-wing ratio (MgII), Lyman α flux (Fα), 10.7-cm solar radio flux (F10.7), and sunspot number (Rz)) were analyzed during the last four consecutive solar activity minima to investigate how they differ during minimum periods and how well they represent solar EUV radiation. Their variability within each minimum and between minima was compared by considering monthly means. A comparison was also made of their role in filtering the effect of solar activity from the critical frequency of the ionospheric F2 layer, foF2, which at mid to low latitudes depends mainly on EUV solar radiation. The last two solar cycles showed unusually low EUV radiation levels according to the four proxies. Regarding the connection between the EUV “true” variation and that of solar proxies, according to the foF2 filtering analysis, MgII and Fα behaved in a more stable and suitable way, whereas Rz and F10.7 could be overestimating EUV levels during the last two minima, implying they would both underestimate the inter-minima difference of EUV when compared with the first two minima. |
| first_indexed | 2024-03-12T02:28:56Z |
| format | Article |
| id | doaj.art-62abac3cada246f78186ab7901e9e198 |
| institution | Directory Open Access Journal |
| issn | 2096-3955 |
| language | English |
| last_indexed | 2024-03-12T02:28:56Z |
| publishDate | 2023-09-01 |
| publisher | Science Press |
| record_format | Article |
| series | Earth and Planetary Physics |
| spelling | doaj.art-62abac3cada246f78186ab7901e9e1982023-09-05T09:56:43ZengScience PressEarth and Planetary Physics2096-39552023-09-017554054710.26464/epp2023050RA367-EliasComparative analysis of extreme ultraviolet solar radiation proxies during minimum activity levelsA. G. Elias0C. R. Martinis1B. F. de Haro Barbas2F. D. Medina3B. S. Zossi4M. Fagre5T. Duran6Laboratorio de Ionosfera, Atmosfera Neutra y Magnetosfera, Facultad de Ciencias Exactas y Tecnologia (FACET), Universidad Nacional de Tucuman (UNT), Tucuman 4000, ArgentinaCenter for Space Physics, Astronomy Department, Boston University, MA 02215, USALaboratorio de Ionosfera, Atmosfera Neutra y Magnetosfera, Facultad de Ciencias Exactas y Tecnologia (FACET), Universidad Nacional de Tucuman (UNT), Tucuman 4000, ArgentinaLaboratorio de Ionosfera, Atmosfera Neutra y Magnetosfera, Facultad de Ciencias Exactas y Tecnologia (FACET), Universidad Nacional de Tucuman (UNT), Tucuman 4000, ArgentinaLaboratorio de Ionosfera, Atmosfera Neutra y Magnetosfera, Facultad de Ciencias Exactas y Tecnologia (FACET), Universidad Nacional de Tucuman (UNT), Tucuman 4000, ArgentinaCONICET, Tucuman 4000, ArgentinaDepartamento de Física, Universidad Nacional del Sur (UNS), Bahia Blanca 8000, ArgentinaFour extreme ultraviolet (EUV) solar radiation proxies (Magnesium II core-to-wing ratio (MgII), Lyman α flux (Fα), 10.7-cm solar radio flux (F10.7), and sunspot number (Rz)) were analyzed during the last four consecutive solar activity minima to investigate how they differ during minimum periods and how well they represent solar EUV radiation. Their variability within each minimum and between minima was compared by considering monthly means. A comparison was also made of their role in filtering the effect of solar activity from the critical frequency of the ionospheric F2 layer, foF2, which at mid to low latitudes depends mainly on EUV solar radiation. The last two solar cycles showed unusually low EUV radiation levels according to the four proxies. Regarding the connection between the EUV “true” variation and that of solar proxies, according to the foF2 filtering analysis, MgII and Fα behaved in a more stable and suitable way, whereas Rz and F10.7 could be overestimating EUV levels during the last two minima, implying they would both underestimate the inter-minima difference of EUV when compared with the first two minima.http://www.eppcgs.org/article/doi/10.26464/epp2023050?pageType=ensolar euv radiationsolar minimumfof2solar activitysolar euv proxy |
| spellingShingle | A. G. Elias C. R. Martinis B. F. de Haro Barbas F. D. Medina B. S. Zossi M. Fagre T. Duran Comparative analysis of extreme ultraviolet solar radiation proxies during minimum activity levels Earth and Planetary Physics solar euv radiation solar minimum fof2 solar activity solar euv proxy |
| title | Comparative analysis of extreme ultraviolet solar radiation proxies during minimum activity levels |
| title_full | Comparative analysis of extreme ultraviolet solar radiation proxies during minimum activity levels |
| title_fullStr | Comparative analysis of extreme ultraviolet solar radiation proxies during minimum activity levels |
| title_full_unstemmed | Comparative analysis of extreme ultraviolet solar radiation proxies during minimum activity levels |
| title_short | Comparative analysis of extreme ultraviolet solar radiation proxies during minimum activity levels |
| title_sort | comparative analysis of extreme ultraviolet solar radiation proxies during minimum activity levels |
| topic | solar euv radiation solar minimum fof2 solar activity solar euv proxy |
| url | http://www.eppcgs.org/article/doi/10.26464/epp2023050?pageType=en |
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