J/A+A/691/L20ivo://CDS.VizieR/J/A+A/691/L20doi:10.26093/cds/vizier.36919020CDSGarcia R.A.Breton S.N.Salabert D.Tripathy S.C.Jain K.Mathur S.,Panetier E.2025-02-26T20:02:00Z2024-11-22T14:07:57ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frthe-sunasteroseismologymagnetic-fieldsSolar magnetic activity follows regular cycles of about 11 years with an inversion of polarity in the poles every ~22 years. This changing surface magnetism impacts the properties of the acoustic modes. The acoustic mode frequency shifts are a good proxy of the magnetic cycle. In this paper, we investigate solar magnetic activity cycles 23 and 24 through the evolution of the frequency shifts of low-degree modes (l= 0, 1, 2) in three frequency bands. These bands probe properties between 74 and 1575 km beneath the surface. The analysis is carried out by using observations from the space instrument Global Oscillations at Low Frequency and the ground-based Birmingham Solar Oscillations Network and Global Oscillation Network Group. The frequency shifts of radial modes suggest that changes in magnetic field amplitude and configuration are likely to occur near the Sun's surface rather than its core. The maximum shifts of solar cycle 24 occur earlier at mid and high latitudes compared to the equator, about 1550km beneath the photosphere. At this depth but near the equator, this maximum aligns with the surface activity but is stronger in magnitude. At around 74km deep, the behaviour near the equator mirrors the surface, while at higher latitudes, it matches the strength of cycle 23.2024A&A...691L..20Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/691/L20CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/617/A108 : Sun velocities from GOLF instrument (Appourchaux+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/691/L20https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/691/L20http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/691/L20https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/691/L20https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/691/L20http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/691/L20GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/691/L20/tableb1GOLF computed averaged frequency shifts ({delta}v) for modes l = 0, 1, and 2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeTimeyrtime.epochdoubledvLFB-l0Averaged frequency shift for l=0 at LFB (1800-2450uHz) band (freq_shift_LFB_l0)uHzem.freqdoublee_dvLFB-l0Error on dvLFB-l0 (err_LFB_l0)uHzstat.errordoubledvMFB-l0Averaged frequency shift for l=0 at MFB (2450-3110uHz) band (freq_shift_MFB_l0)uHzem.freqdoublee_dvMFB-l0Error on dvMFB-l0 (err_MFB_l0)uHzstat.errordoubledvHFB-l0Averaged frequency shift for l=0 at HFB (3110-3890uHz) band (freq_shift_HFB_l0)uHzem.freqdoublee_dvHFB-l0Error on dvHFB-l0 (err_HFB_l0)uHzstat.errordoubledvLFB-l1Averaged frequency shift for l=1 at LFB (1800-2450uHz) band (freq_shift_LFB_l1)uHzem.freqdoublee_dvLFB-l1Error on dvLFB-l1 (err_LFB_l1)uHzstat.errordoubledvMFB-l1Averaged frequency shift for l=1 at HFB (3110-3890uHz) band (freq_shift_MFB_l1)uHzem.freqdoublee_dvMFB-l1Error on dvMFB-l1 (err_MFB_l1)uHzstat.errordoubledvHFB-l1Averaged frequency shift for l=1 at MFB (2450-3110uHz) band (freq_shift_HFB_l1)uHzem.freqdoublee_dvHFB-l1Error on dvHFB-l1 (err_HFB_l1)uHzstat.errordoubledvLFB-l2Averaged frequency shift for l=2 at LFB (1800-2450uHz) band (freq_shift_LFB_l2)uHzem.freqdoublee_dvLFB-l2Error on dvLFB-l2 (err_LFB_l2)uHzstat.errordoubledvMFB-l2Averaged frequency shift for l=2 at MFB (2450-3110uHz) band (freq_shift_MFB_l2)uHzem.freqdoublee_dvMFB-l2Error on dvMFB-l2 (err_MFB_l2)uHzstat.errordoubledvHFB-l2Averaged frequency shift for l=2 at HFB (3110-3890uHz) band (freq_shift_HFB_l2)uHzem.freqdoublee_dvHFB-l2Error on dvHFB-l2 (err_HFB_l2)uHzstat.errordoubleJ/A+A/691/L20/tableb2BiSON computed averaged frequency shifts ({delta}v) for modes l = 0, 1, and 2TimeTimeyrtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintdvLFB-l0Averaged frequency shift for l=0 at LFB (1800-2450uHz) band (freq_shift_LFB_l0)uHzem.freqdoublee_dvLFB-l0Error on dvLFB-l0 (err_LFB_l0)uHzstat.errordoubledvMFB-l0Averaged frequency shift for l=0 at MFB (2450-3110uHz) band (freq_shift_MFB_l0)uHzem.freqdoublee_dvMFB-l0Error on dvMFB-l0 (err_MFB_l0)uHzstat.errordoubledvHFB-l0Averaged frequency shift for l=0 at HFB (3110-3890uHz) band (freq_shift_HFB_l0)uHzem.freqdoublee_dvLFB-l2Error on dvLFB-l2 (err_LFB_l2)uHzstat.errordoubledvMFB-l2Averaged frequency shift for l=2 at MFB (2450-3110uHz) band (freq_shift_MFB_l2)uHzem.freqdoublee_dvMFB-l2Error on dvMFB-l2 (err_MFB_l2)uHzstat.errordoubledvHFB-l2Averaged frequency shift for l=2 at HFB (3110-3890uHz) band (freq_shift_HFB_l2)uHzem.freqdoublee_dvHFB-l2Error on dvHFB-l2 (err_HFB_l2)uHzstat.errordoublee_dvHFB-l0Error on dvHFB-l0 (err_HFB_l0)uHzstat.errordoubledvLFB-l1Averaged frequency shift for l=1 at LFB (1800-2450uHz) band (freq_shift_LFB_l1)uHzem.freqdoublee_dvLFB-l1Error on dvLFB-l1 (err_LFB_l1)uHzstat.errordoubledvMFB-l1Averaged frequency shift for l=1 at HFB (3110-3890uHz) band (freq_shift_MFB_l1)uHzem.freqdoublee_dvMFB-l1Error on dvMFB-l1 (err_MFB_l1)uHzstat.errordoubledvHFB-l1Averaged frequency shift for l=1 at MFB (2450-3110uHz) band (freq_shift_HFB_l1)uHzem.freqdoublee_dvHFB-l1Error on dvHFB-l1 (err_HFB_l1)uHzstat.errordoubledvLFB-l2Averaged frequency shift for l=2 at LFB (1800-2450uHz) band (freq_shift_LFB_l2)uHzem.freqdoubleJ/A+A/691/L20/tableb3GONG computed averaged frequency shifts ({delta}v) for modes l = 0, 1, and 2e_dvMFB-l1Error on dvMFB-l1 (err_MFB_l1)uHzstat.errordoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeTimeyrtime.epochdoubledvLFB-l0Averaged frequency shift for l=0 at LFB (1800-2450uHz) band (freq_shift_LFB_l0)uHzem.freqdoublee_dvLFB-l0Error on dvLFB-l0 (err_LFB_l0)uHzstat.errordoubledvMFB-l0Averaged frequency shift for l=0 at MFB (2450-3110uHz) band (freq_shift_MFB_l0)uHzem.freqdoublee_dvMFB-l0Error on dvMFB-l0 (err_MFB_l0)uHzstat.errordoubledvHFB-l0Averaged frequency shift for l=0 at HFB (3110-3890uHz) band (freq_shift_HFB_l0)uHzem.freqdoublee_dvHFB-l0Error on dvHFB-l0 (err_HFB_l0)uHzstat.errordoubledvLFB-l1Averaged frequency shift for l=1 at LFB (1800-2450uHz) band (freq_shift_LFB_l1)uHzem.freqdoublee_dvLFB-l1Error on dvLFB-l1 (err_LFB_l1)uHzstat.errordoubledvMFB-l1Averaged frequency shift for l=1 at HFB (3110-3890uHz) band (freq_shift_MFB_l1)uHzem.freqdoubledvHFB-l1Averaged frequency shift for l=1 at MFB (2450-3110uHz) band (freq_shift_HFB_l1)uHzem.freqdoublee_dvHFB-l1Error on dvHFB-l1 (err_HFB_l1)uHzstat.errordoubledvLFB-l2Averaged frequency shift for l=2 at LFB (1800-2450uHz) band (freq_shift_LFB_l2)uHzem.freqdoublee_dvLFB-l2Error on dvLFB-l2 (err_LFB_l2)uHzstat.errordoubledvMFB-l2Averaged frequency shift for l=2 at MFB (2450-3110uHz) band (freq_shift_MFB_l2)uHzem.freqdoublee_dvMFB-l2Error on dvMFB-l2 (err_MFB_l2)uHzstat.errordoubledvHFB-l2Averaged frequency shift for l=2 at HFB (3110-3890uHz) band (freq_shift_HFB_l2)uHzem.freqdoublee_dvHFB-l2Error on dvHFB-l2 (err_HFB_l2)uHzstat.errordouble