Table · dataset · 2024
Seismic diff. between solar magnetic cycles 23/24
Listed in IVOA Registry (Virtual Observatory)
Solar magnetic activity follows regular cycles of about 11 years with an inversion of polarity in the poles every ~22 years.
Description
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.
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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.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/691/L20 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2024A&A...691L..20G ui.adsabs.harvard.edu/abs/2024A%26A...691L..20G ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/a%2Ba/691/l20 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 7 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/691/l20 | 15 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |