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dc.contributor.authorEren, Saliha
dc.contributor.authorRozelot, Jean-Pierre
dc.date.accessioned2023-08-31T08:28:15Z
dc.date.available2023-08-31T08:28:15Z
dc.date.issued2023-01-17
dc.description.abstractRecently, Rozelot & Eren pointed out that the first solar gravitational moment (J<sub>2</sub>) might exhibit a temporal variation. The suggested explanation is through the temporal variation of the solar rotation with latitude. This issue is deeper developed due to an accurate knowledge of the long-term variations in solar differential rotation regarding solar activity. Here we analyze solar cycles 12–24, investigating the long-term temporal variations in solar differential rotation. It is shown that J<sub>2</sub> exhibits a net modulation over the 13 studied cycles of ≈(89.6 ± 0.1) yr, with a peak-to-peak amplitude of ≈0.1 × 10<sup>−7</sup> for a reference value of 2.07 × 10<sup>−7</sup>). Moreover, J<sub>2</sub> exhibits a positive linear trend in the period of minima solar activity (sunspot number up to around 40) and a marked declining trend in the period of maxima (sunspot number above 50). In absolute magnitude, the mean value of J<sub>2</sub> is more significant during periods of minimum than in periods of maximum. These findings are based on observational results that are not free of errors and can be refined further by considering torsional oscillations for example. They are comforted by identifying a periodic variation of the J<sub>2</sub> term evidenced through the analysis of the perihelion precession of planetary orbits either deduced from ephemerides or computed in the solar equatorial coordinate system instead of the ecliptic coordinate one usually used.en_US
dc.identifier.citationEren, Rozelot. Exploring the Temporal Variation of the Solar Quadrupole Moment J <inf>2</inf>. The Astrophysical Journal (ApJ). 2023;942(2)en_US
dc.identifier.cristinIDFRIDAID 2143379
dc.identifier.doi10.3847/1538-4357/aca8a4
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.urihttps://hdl.handle.net/10037/30572
dc.language.isoengen_US
dc.publisherIOP Publishingen_US
dc.relation.journalThe Astrophysical Journal (ApJ)
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2023 The Author(s)en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)en_US
dc.titleExploring the Temporal Variation of the Solar Quadrupole Moment J2en_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's license is described as Attribution 4.0 International (CC BY 4.0)