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A HEMISPHERIC HELICITY SIGN RULE INDICATED BY LARGE-SCALE PHOTOSPHERIC MAGNETIC FIELDS AT THREE PHASES OF SOLAR CYCLE 23
Wang, Chuanyu; Zhang, Mei
2010-09-01
Source PublicationASTROPHYSICAL JOURNAL
Volume720Issue:1Pages:632-638
AbstractThe hemispheric sign rule of current helicity is examined for large-scale magnetic fields, extending to 60 degrees high in solar latitudes, at three different phases of solar cycle 23 and using three different instruments. The current helicity is calculated from the vector magnetic fields derived respectively from the longitudinal full-disk magnetograms obtained by the Michelson Doppler Imager on board the Solar and Heliospheric Observatory as well as the Kitt Peak Vacuum Telescope and the Synoptic Long-term Investigations of the Sun at the National Solar Observatory at Kitt Peak. We have used the same technique introduced by Pevtsov & Latushko to retrieve the vector magnetic field but have applied a different method to calculate the current helicity. Our analysis strengthens evidence that the large-scale magnetic fields show a clear and consistent current helicity pattern that follows the established hemispheric rule, that is, a positive helicity sign in the southern hemisphere and a negative helicity sign in the northern hemisphere. This hemispheric sign pattern is present everywhere in the global magnetic field, extending to 60 high in solar latitudes, independent of the instruments and parameters used, and is evident at both solar maximum and minimum phases.
KeywordSun: Magnetic Topology Sun: Photosphere Sun: Surface Magnetism
DOI10.1088/0004-637X/720/1/632
Indexed BySCI
Language英语
WOS IDWOS:000281596000055
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7699
Collection太阳物理研究部
AffiliationChinese Acad Sci, Key Lab Solar Activ, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Wang, Chuanyu,Zhang, Mei. A HEMISPHERIC HELICITY SIGN RULE INDICATED BY LARGE-SCALE PHOTOSPHERIC MAGNETIC FIELDS AT THREE PHASES OF SOLAR CYCLE 23[J]. ASTROPHYSICAL JOURNAL,2010,720(1):632-638.
APA Wang, Chuanyu,&Zhang, Mei.(2010).A HEMISPHERIC HELICITY SIGN RULE INDICATED BY LARGE-SCALE PHOTOSPHERIC MAGNETIC FIELDS AT THREE PHASES OF SOLAR CYCLE 23.ASTROPHYSICAL JOURNAL,720(1),632-638.
MLA Wang, Chuanyu,et al."A HEMISPHERIC HELICITY SIGN RULE INDICATED BY LARGE-SCALE PHOTOSPHERIC MAGNETIC FIELDS AT THREE PHASES OF SOLAR CYCLE 23".ASTROPHYSICAL JOURNAL 720.1(2010):632-638.
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