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Article: Seasonal Variations of Sq Current System in Different Longitudinal Sectors and Solar Activities

TitleSeasonal Variations of Sq Current System in Different Longitudinal Sectors and Solar Activities
Authors
Keywordslongitudinal effects
low and middle latitudes
seasonal variations
solar activity dependence
Sq currents
Issue Date2024
Citation
Journal of Geophysical Research: Space Physics, 2024, v. 129, n. 1, article no. e2023JA031956 How to Cite?
AbstractYears of geomagnetic observatory data during the geomagnetic quiet days (Kp ≤ 3) at the low and middle dip latitudes from INTERMAGNET and SuperMAG were utilized. Seasonal models of Sq currents for two longitudinal chains at each year and under two solar activity levels (F10.7 index are ∼75 and 125 sfu) were constructed by spherical harmonic analysis. It is found that there are significant seasonal variations of Sq currents in the Asian-Oceanian (A-O) and North-South American (N-SA) longitude sectors under different solar activities. First, the focus intensity J increases faster in local winter than in summer for both two hemispheres as solar activity strengthens. J of ionospheric currents in the northern hemisphere (NH) during local winter is higher than that in the southern hemisphere during its winter. This asymmetric activity in the N-SA chain increases with the solar activity becomes stronger. Second, with solar activity increases, the ionospheric current focus of N-SA chain in the NH shifts toward the lower latitudes during two solstices, while internal current focus of both two chains move toward the lower latitudes during the December solstice. Seasonal variations of Sq currents in the two chains exhibit longitudinal effects. With increasing solar activity, the two hemispheric focuses of the ionospheric currents in the A-O chain both move closer to the midday longitude sector, while in the N-SA chain, only the focus in the NH shifts toward noon. The results reveal details of the seasonal variations of Sq currents.
Persistent Identifierhttp://hdl.handle.net/10722/341025
ISSN
2023 Impact Factor: 2.6
2023 SCImago Journal Rankings: 0.845
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLiu, Xiaocan-
dc.contributor.authorHan, Peng-
dc.contributor.authorHattori, Katsumi-
dc.contributor.authorChen, Huaran-
dc.contributor.authorChen, Junjie-
dc.contributor.authorJiao, Liguo-
dc.contributor.authorTu, Jiyao-
dc.contributor.authorLei, Yu-
dc.contributor.authorZhao, Junhao-
dc.date.accessioned2024-03-13T08:39:34Z-
dc.date.available2024-03-13T08:39:34Z-
dc.date.issued2024-
dc.identifier.citationJournal of Geophysical Research: Space Physics, 2024, v. 129, n. 1, article no. e2023JA031956-
dc.identifier.issn2169-9380-
dc.identifier.urihttp://hdl.handle.net/10722/341025-
dc.description.abstractYears of geomagnetic observatory data during the geomagnetic quiet days (Kp ≤ 3) at the low and middle dip latitudes from INTERMAGNET and SuperMAG were utilized. Seasonal models of Sq currents for two longitudinal chains at each year and under two solar activity levels (F10.7 index are ∼75 and 125 sfu) were constructed by spherical harmonic analysis. It is found that there are significant seasonal variations of Sq currents in the Asian-Oceanian (A-O) and North-South American (N-SA) longitude sectors under different solar activities. First, the focus intensity J increases faster in local winter than in summer for both two hemispheres as solar activity strengthens. J of ionospheric currents in the northern hemisphere (NH) during local winter is higher than that in the southern hemisphere during its winter. This asymmetric activity in the N-SA chain increases with the solar activity becomes stronger. Second, with solar activity increases, the ionospheric current focus of N-SA chain in the NH shifts toward the lower latitudes during two solstices, while internal current focus of both two chains move toward the lower latitudes during the December solstice. Seasonal variations of Sq currents in the two chains exhibit longitudinal effects. With increasing solar activity, the two hemispheric focuses of the ionospheric currents in the A-O chain both move closer to the midday longitude sector, while in the N-SA chain, only the focus in the NH shifts toward noon. The results reveal details of the seasonal variations of Sq currents.-
dc.languageeng-
dc.relation.ispartofJournal of Geophysical Research: Space Physics-
dc.subjectlongitudinal effects-
dc.subjectlow and middle latitudes-
dc.subjectseasonal variations-
dc.subjectsolar activity dependence-
dc.subjectSq currents-
dc.titleSeasonal Variations of Sq Current System in Different Longitudinal Sectors and Solar Activities-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1029/2023JA031956-
dc.identifier.scopuseid_2-s2.0-85183908366-
dc.identifier.volume129-
dc.identifier.issue1-
dc.identifier.spagearticle no. e2023JA031956-
dc.identifier.epagearticle no. e2023JA031956-
dc.identifier.eissn2169-9402-
dc.identifier.isiWOS:001150320800001-

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