Morphological study of penumbral formation

Publications of the Astronomical Society of Japan

Kitai, Reizaburo¹  Watanabe, Hiroko³  Otsuji, Ken'ichi² 

[1] Kwasan and Hida Observatories, Kyoto University, Yamashina, Kyoto, Kyoto 607-8471, Japan;National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;Unit of Synergetic Studies for Space, Kyoto University, Yamashina, Kyoto, Kyoto 607-8471, Japan

关键词: convection;    "Sun: magnetic fields";    "Sun: photosphere";    sunspots;   

DOI  :  10.1093/pasj/psu084

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Penumbraeareknowntobeareasofmainlyhorizontalmagneticfieldsurroundingumbraeofrelativelylargeandmaturesunspots.Inthispaper,weobservationallystudiedtheformationofpenumbraeinNOAA 10978,whereseveralpenumbralformationswereobservedinG-bandimagesoftheSolarOpticalTelescopeonboardHinode.ThankstothecontinuousobservationbyHinode,wecouldmorphologicallyfollowtheevolutionofsunspotsandfoundthatthereareseveralpathstothepenumbralformation:(1)activeaccumulationofmagneticflux,(2)rapidemergenceofmagneticfield,and(3)appearanceoftwistedorrotatingmagnetictubes.Inallofthesecases,magneticfieldsareexpectedtosustainhighinclinationattheedgesoffluxtubeconcentrationlongerthanthecharacteristicgrowthtimeofdownwardmagneticpumping.

【 授权许可】

Unknown