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Systematic investigation of mid-term periodicity of the solar full-disk magnetic fields
Xiang, Nan-Bin1,2,3
2019-09-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume19Issue:9Pages:12
Corresponding AuthorXiang, Nan-Bin(nanbin@ynao.ac.cn)
AbstractThe Magnetic Plage Strength Index (MPSI) and the Mount Wilson Sunspot Index (MWSI), which have been measured at Mount Wilson Observatory (MWO) since the 1970s and which indicate weak and strong magnetic field activity on the solar full disk, respectively, are used to systematically investigate midterm periodicities in the solar full-disk magnetic fields. Multitudinous mid-term periodicities are detected in MPSI and MWSI on timescales of 0.3 to 4.5 yr, and these periodicities are found to fluctuate around several typical periodicities within a small amplitude in different solar cycles or phases. The periodicity of 3.44 yr is found in MPSI, and the periodicities of 3.85 and 3.00 yr are detected in MWSI. Our analysis indicates that they reflect the true oscillating signals of solar magnetic field activity. The typical periodicities are 2.8, 2.3 and 1.8 yr in MPSI and MWSI, and possible mechanisms for these periodicities are discussed. A 1.3 yr periodicity is only detected in MPSI, and should be related to meridional flows on the solar surface. The typical annual periodicity of MPSI and MWSI is 1.07 yr, which is not derived from the annual variation of Earth's heliolatitude. Several periodicities shorter than 1 yr found in MPSI and MWSI are considered to be Rieger-type periodicities.
KeywordSun: general Sun: activity Sun: magnetic fields
DOI10.1088/1674-4527/19/9/131
WOS KeywordNORTH-SOUTH ASYMMETRY ; SHORT-TERM PERIODICITIES ; MOUNT-WILSON ; ACTIVITY INDEXES ; WAVELET ANALYSIS ; SUNSPOT AREAS ; ROSSBY WAVES ; R-MODES ; OSCILLATIONS ; ROTATION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000485147000009
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27878
Collection中国科学院紫金山天文台
Corresponding AuthorXiang, Nan-Bin
Affiliation1.Chinese Acad Sci, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China
2.Natl Astron Observ, CAS Key Lab Solar Act, Beijing 100101, Peoples R China
3.Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
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Xiang, Nan-Bin. Systematic investigation of mid-term periodicity of the solar full-disk magnetic fields[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2019,19(9):12.
APA Xiang, Nan-Bin.(2019).Systematic investigation of mid-term periodicity of the solar full-disk magnetic fields.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,19(9),12.
MLA Xiang, Nan-Bin."Systematic investigation of mid-term periodicity of the solar full-disk magnetic fields".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 19.9(2019):12.
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