Ionospheric Current Variations Induced by the Solar Flares of 6 and 10 September 2017
Abstract We examine the global ionospheric current in relation to X9.33 disk and X8.28 limb flares, which had significant differences in their solar X‐ray and extreme ultraviolet (EUV) fluxes using the ground‐based magnetometer data. At the peak of X9.33 flare, when X‐ray and EUV radiations were sig...
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| Format: | Article |
| Language: | English |
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Wiley
2020-11-01
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| Series: | Space Weather |
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| Online Access: | https://doi.org/10.1029/2020SW002608 |
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| author | Charles Owolabi Jiuhou Lei O. S. Bolaji Dexin Ren Akimasa Yoshikawa |
| author_facet | Charles Owolabi Jiuhou Lei O. S. Bolaji Dexin Ren Akimasa Yoshikawa |
| author_sort | Charles Owolabi |
| collection | DOAJ |
| description | Abstract We examine the global ionospheric current in relation to X9.33 disk and X8.28 limb flares, which had significant differences in their solar X‐ray and extreme ultraviolet (EUV) fluxes using the ground‐based magnetometer data. At the peak of X9.33 flare, when X‐ray and EUV radiations were significantly enhanced, the northern current vortex was situated at (40°N, 12 LT), while the southern current vortex was found at (30°S, 13LT). In comparison to the X8.28 flare, the northern current vortex was seen at (16°N, 12LT), while the southern current vortex was situated at (35°S, 14LT), which was 2 hr earlier in local time compared to those observed in the X9.33 flare. The changes in the total current intensity of the X9.33 flare is about 16% less than that of the X8.28 flare, thus revealing that the current variations relative to both flares are due to solar flux and universal time variations. The daytime X9.33 flare northern current vortex is stronger, while the southern vortex is less intense than the corresponding vortex of X8.28 flare. Even though both flares happened in equinox, the current vortices are nearly symmetric. There were significant hemispheric changes in the focus position leading to the hemispheric asymmetry. Our results indicated that both the enhanced X‐ray and EUV fluxes during flares could have impacts on the ionospheric electric field and current, but their relative contributions and the underlying physics need further investigations. |
| format | Article |
| id | doaj-art-48652fb55157488db8d8b3b2c044408c |
| institution | Kabale University |
| issn | 1542-7390 |
| language | English |
| publishDate | 2020-11-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-48652fb55157488db8d8b3b2c044408c2025-01-14T16:30:47ZengWileySpace Weather1542-73902020-11-011811n/an/a10.1029/2020SW002608Ionospheric Current Variations Induced by the Solar Flares of 6 and 10 September 2017Charles Owolabi0Jiuhou Lei1O. S. Bolaji2Dexin Ren3Akimasa Yoshikawa4CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences University of Science and Technology of China Hefei ChinaCAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences University of Science and Technology of China Hefei ChinaDepartment of Physics University of Lagos Lagos NigeriaCAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences University of Science and Technology of China Hefei ChinaInternational Center for Space Weather Science and Education Kyushu University Fukuoka JapanAbstract We examine the global ionospheric current in relation to X9.33 disk and X8.28 limb flares, which had significant differences in their solar X‐ray and extreme ultraviolet (EUV) fluxes using the ground‐based magnetometer data. At the peak of X9.33 flare, when X‐ray and EUV radiations were significantly enhanced, the northern current vortex was situated at (40°N, 12 LT), while the southern current vortex was found at (30°S, 13LT). In comparison to the X8.28 flare, the northern current vortex was seen at (16°N, 12LT), while the southern current vortex was situated at (35°S, 14LT), which was 2 hr earlier in local time compared to those observed in the X9.33 flare. The changes in the total current intensity of the X9.33 flare is about 16% less than that of the X8.28 flare, thus revealing that the current variations relative to both flares are due to solar flux and universal time variations. The daytime X9.33 flare northern current vortex is stronger, while the southern vortex is less intense than the corresponding vortex of X8.28 flare. Even though both flares happened in equinox, the current vortices are nearly symmetric. There were significant hemispheric changes in the focus position leading to the hemispheric asymmetry. Our results indicated that both the enhanced X‐ray and EUV fluxes during flares could have impacts on the ionospheric electric field and current, but their relative contributions and the underlying physics need further investigations.https://doi.org/10.1029/2020SW002608space weathersolar flaressolar X‐ray radiationsolar extreme ultraviolet irradiancegeomagnetic fieldionospheric current |
| spellingShingle | Charles Owolabi Jiuhou Lei O. S. Bolaji Dexin Ren Akimasa Yoshikawa Ionospheric Current Variations Induced by the Solar Flares of 6 and 10 September 2017 Space Weather space weather solar flares solar X‐ray radiation solar extreme ultraviolet irradiance geomagnetic field ionospheric current |
| title | Ionospheric Current Variations Induced by the Solar Flares of 6 and 10 September 2017 |
| title_full | Ionospheric Current Variations Induced by the Solar Flares of 6 and 10 September 2017 |
| title_fullStr | Ionospheric Current Variations Induced by the Solar Flares of 6 and 10 September 2017 |
| title_full_unstemmed | Ionospheric Current Variations Induced by the Solar Flares of 6 and 10 September 2017 |
| title_short | Ionospheric Current Variations Induced by the Solar Flares of 6 and 10 September 2017 |
| title_sort | ionospheric current variations induced by the solar flares of 6 and 10 september 2017 |
| topic | space weather solar flares solar X‐ray radiation solar extreme ultraviolet irradiance geomagnetic field ionospheric current |
| url | https://doi.org/10.1029/2020SW002608 |
| work_keys_str_mv | AT charlesowolabi ionosphericcurrentvariationsinducedbythesolarflaresof6and10september2017 AT jiuhoulei ionosphericcurrentvariationsinducedbythesolarflaresof6and10september2017 AT osbolaji ionosphericcurrentvariationsinducedbythesolarflaresof6and10september2017 AT dexinren ionosphericcurrentvariationsinducedbythesolarflaresof6and10september2017 AT akimasayoshikawa ionosphericcurrentvariationsinducedbythesolarflaresof6and10september2017 |