Helioseismology and the solar cycle
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| Title: | Helioseismology and the solar cycle |
|---|---|
| Authors: | Howe, Rachel1 rhowe@noao.edu |
| Source: | Advances in Space Research. Mar2008, Vol. 41 Issue 6, p846-854. 9p. |
| Subjects: | Helioseismology, Solar cycle, Solar magnetic fields, Solar activity |
| Abstract: | Abstract: Helioseismic measurements stretching back for about three decades have clearly shown that the acoustic modes are sensitive to solar-cycle changes. 2006 marks the first full 11-year cycle of continuous observations from the Global Oscillation Network Group (GONG), and 10 years of observations with the Michelson Doppler Imager (MDI) aboard the SOHO spacecraft. For the first time, global helioseismology has traced the migrating zonal flow pattern of the torsional oscillation deep within the convection zone, while local helioseismology has revealed the changing pattern of meridional flows over the cycle. The frequencies, lifetimes, and amplitudes of acoustic modes all show variations that closely track the surface distribution of magnetic activity and may provide insight into the excitation and damping of the oscillations. Efforts to trace magnetic field and sound speed or density changes in the solar interior have proved more challenging. This paper reviews the most important results, highlighting recent achievements but also providing a historical perspective. [Copyright &y& Elsevier] |
| Copyright of Advances in Space Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 30066228 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Helioseismology and the solar cycle – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Howe%2C+Rachel%22">Howe, Rachel</searchLink><relatesTo>1</relatesTo><i> rhowe@noao.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Advances+in+Space+Research%22">Advances in Space Research</searchLink>. Mar2008, Vol. 41 Issue 6, p846-854. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Helioseismology%22">Helioseismology</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+cycle%22">Solar cycle</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+magnetic+fields%22">Solar magnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+activity%22">Solar activity</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: Helioseismic measurements stretching back for about three decades have clearly shown that the acoustic modes are sensitive to solar-cycle changes. 2006 marks the first full 11-year cycle of continuous observations from the Global Oscillation Network Group (GONG), and 10 years of observations with the Michelson Doppler Imager (MDI) aboard the SOHO spacecraft. For the first time, global helioseismology has traced the migrating zonal flow pattern of the torsional oscillation deep within the convection zone, while local helioseismology has revealed the changing pattern of meridional flows over the cycle. The frequencies, lifetimes, and amplitudes of acoustic modes all show variations that closely track the surface distribution of magnetic activity and may provide insight into the excitation and damping of the oscillations. Efforts to trace magnetic field and sound speed or density changes in the solar interior have proved more challenging. This paper reviews the most important results, highlighting recent achievements but also providing a historical perspective. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Advances in Space Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=30066228 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.asr.2006.12.033 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 846 Subjects: – SubjectFull: Helioseismology Type: general – SubjectFull: Solar cycle Type: general – SubjectFull: Solar magnetic fields Type: general – SubjectFull: Solar activity Type: general Titles: – TitleFull: Helioseismology and the solar cycle Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Howe, Rachel IsPartOfRelationships: – BibEntity: Dates: – D: 29 M: 03 Text: Mar2008 Type: published Y: 2008 Identifiers: – Type: issn-print Value: 02731177 Numbering: – Type: volume Value: 41 – Type: issue Value: 6 Titles: – TitleFull: Advances in Space Research Type: main |
| ResultId | 1 |
