Solar and lunar daily geomagnetic variations and their equivalent current systems observed by Swarm

dc.bibliographicCitation.firstPage99eng
dc.bibliographicCitation.journalTitleEarth, planets and space : EPSeng
dc.bibliographicCitation.volume74eng
dc.contributor.authorYamazaki, Yosuke
dc.date.accessioned2022-11-22T08:36:31Z
dc.date.available2022-11-22T08:36:31Z
dc.date.issued2022
dc.description.abstractThis paper describes solar and lunar daily variations of the geomagnetic field over low- and mid-latitude regions, using vector magnetometer data from Swarm satellites at altitudes of ∼500 km during the solar minimum years of 2017–2020. The average solar variation of the geomagnetic field is within the range of ±14 nT, while the lunar variation is within ±2 nT. The latter is comparable to the ocean tidal field. A spherical harmonic analysis is performed on the solar and lunar variations to evaluate their internal and external equivalent current systems. The results show that both the solar and lunar variations are mainly of internal origin, which can be attributed to combined effects of ionospheric dynamo currents and induced underground currents. Global patterns of the internal solar and lunar current systems are consistent with the corresponding external current systems previously reported based on ground observations. The Swarm external currents are mainly in the meridional direction, and are likely associated with interhemispheric field-aligned currents. Both the internal and external current systems depend on the season and longitude.eng
dc.description.versionpublishedVersioneng
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/10396
dc.identifier.urihttp://dx.doi.org/10.34657/9432
dc.language.isoengeng
dc.publisherHeidelberg : Springereng
dc.relation.doihttps://doi.org/10.1186/s40623-022-01656-9
dc.relation.essn1880-5981
dc.rights.licenseCC BY 4.0 Unportedeng
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/eng
dc.subject.ddc550eng
dc.subject.otherDaily variationeng
dc.subject.otherGeomagnetic fieldeng
dc.subject.otherIonospheric currentseng
dc.subject.otherLeng
dc.subject.otherSqeng
dc.subject.otherSwarmeng
dc.titleSolar and lunar daily geomagnetic variations and their equivalent current systems observed by Swarmeng
dc.typeArticleeng
dc.typeTexteng
tib.accessRightsopenAccesseng
wgl.contributorIAPeng
wgl.subjectGeowissenschafteneng
wgl.typeZeitschriftenartikeleng
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