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Latitudinal migration of sunspots based on the ESAI database
Zhang J(张娟)1,3,4; Li FY(李富羽)1,3,5; Feng, Wen2
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2018
Volume18Issue:1
DOI10.1088/1674-4527/18/1/7
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: Activity Sun: General Sun: Sunspots Methods: Data Analysis
Abstract

The latitudinal migration of sunspots toward the equator, which implies there is propagation of the toroidal magnetic flux wave at the base of the solar convection zone, is one of the crucial observational bases for the solar dynamo to generate a magnetic field by shearing of the pre-existing poloidal magnetic field through differential rotation. The Extended time series of Solar Activity Indices (ESAI) elongated the Greenwich observation record of sunspots by several decades in the past. In this study, ESAI's yearly mean latitude of sunspots in the northern and southern hemispheres during the years 1854 to 1985 is utilized to statistically test whether hemispherical latitudinal migration of sunspots in a solar cycle is linear or nonlinear. It is found that a quadratic function is statistically significantly better at describing hemispherical latitudinal migration of sunspots in a solar cycle than a linear function. In addition, the latitude migration velocity of sunspots in a solar cycle decreases as the cycle progresses, providing a particular constraint for solar dynamo models. Indeed, the butterfly wing pattern with a faster latitudinal migration rate should present stronger solar activity with a shorter cycle period, and it is located at higher latitudinal position, giving evidence to support the Babcock-Leighton dynamo mechanism.

Funding ProjectNational Natural Science Foundation of China[11573065] ; National Natural Science Foundation of China[11633008] ; Specialized Research Fund for State Key Laboratories ; Chinese Academy of Sciences
Funding OrganizationNational Natural Science Foundation of China[11573065, 11633008] ; Specialized Research Fund for State Key Laboratories ; Chinese Academy of Sciences
Language英语
Subject Area天文学 ; 太阳与太阳系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Publication Place20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
ISSN1674-4527
URL查看原文
WOS IDWOS:000428267100007
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordDOUBLE MAGNETIC CYCLE ; SOLAR ACTIVE REGIONS ; MEAN-FIELD ALPHA ; DYNAMO ; MODEL ; CONVECTION ; FILAMENTS ; SURFACE ; SUN
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12302
Collection抚仙湖太阳观测站
Corresponding AuthorFeng, Wen
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.Research Center of Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
5.State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang J,Li FY,Feng, Wen. Latitudinal migration of sunspots based on the ESAI database[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(1).
APA Zhang J,Li FY,&Feng, Wen.(2018).Latitudinal migration of sunspots based on the ESAI database.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(1).
MLA Zhang J,et al."Latitudinal migration of sunspots based on the ESAI database".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.1(2018).
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