Observations of Sunspot Oscillations in G Band and Ca II H Line with Solar Optical Telescope on Hinode
[摘要] Exploitinghigh-resolutionobservationsmadebytheSolarOpticalTelescopeonboardHinode,weinvestigatethespatialdistributionofthepowerspectraldensityoftheoscillatorysignalinandaroundtheactiveregionNOAA10935.TheG-banddatashowthatintheumbratheoscillatorypowerissuppressedinallfrequencyranges.Ontheotherhand,inCaIIHintensitymapsoscillationsintheumbra,so-calledumbralflashes,areclearlyseenwiththepowerpeakingaround5.5 mHz.TheCaIIHpowerdistributionshowstheenhancedelementswiththespatialscaleoftheumbralflashesovermostoftheumbra,butthereisaregionwithsuppressedpoweratthecenteroftheumbra.Theoriginandpropertyofthisnode-likefeatureremainunexplained.
[发布日期] [发布机构]
[效力级别] [学科分类] 天文学(综合)
[关键词] "Sun: chromosphere";"Sun: oscillations";sunspots [时效性]
