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Projection effects on physical parameters obtained from solar vector magnetograms
Li, H
2002-04-01
Source PublicationCHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
Volume2Issue:2Pages:174-182
AbstractProjection effects in Huairou solar vector magnetograms are corrected by transferring or mapping the observed vector magnetogram in the image plane to the heliographic plane (planar correction) and to the heliospheric coordinate system (spherical correction). The magnetograms after the correction are considerably different. The planar correction and the spherical correction lead to slightly different magnetic configurations, especially when the active region involved is far from the disk center. We also discuss the effects of the corrections on magnetic activity parameters, such as magnetic shear, current helicity, etc. It is shown that the neutral line is obviously distorted after the mapping. The mapping generally decreases the average shear angle on the neutral line by several degrees when the active region is in the eastern hemisphere, and increases it when in the western hemisphere. In most of the cases studied, the correction reduces the current helicity imbalance, and sometimes even changes its sign. It is found that the current helicity imbalance may change its sign in its evolution when there are apparent fluxes emerging from the lower photosphere. The corrections increase the noise level of B-z greatly, and decrease the noise level of B-t slightly. The accuracy of the magnetic field measurement at Huairou is estimated to be better than 20 G and 150 G for the longitudinal and the transverse component, respectively.
KeywordSun : Magnetic Fields Sun : Activity Sun : Photosphere
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordMAGNETIC SHEAR ; CURRENT HELICITY ; ACTIVE-REGION ; CLASS FLARES ; FIELD ; EVOLUTION ; SOLAR-CYCLE-22
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000175150900011
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/7928
Collection太阳高能及相关物理过程研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Acad Sinica, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Li, H. Projection effects on physical parameters obtained from solar vector magnetograms[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2002,2(2):174-182.
APA Li, H.(2002).Projection effects on physical parameters obtained from solar vector magnetograms.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2(2),174-182.
MLA Li, H."Projection effects on physical parameters obtained from solar vector magnetograms".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 2.2(2002):174-182.
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