Hinode Observations of a Vector Magnetic Field Change Associated with a Flare on 2006 December 13

[摘要] Continuousobservationsoftheflareproductiveactiveregion10930weresuccessfullycarriedoutwiththeSolarOpticalTelescopeaboardtheHinodespacecraftduring2006December6to19.Wefocusedontheevolutionofphotosphericmagneticfieldsinthisactiveregion,andthemagneticfieldpropertiesatthesiteoftheX3.4classflare,usingatimeseriesofvectorfieldmapswithhighspatialresolution.TheX3.4classflareoccurredon2006December13attheapparentcollisionsitebetweenthelarge,oppositepolarityumbrae.Elongatedmagneticstructureswithalternatinglypositiveandnegativepolaritiesresultingfromfluxemergenceappearedonedaybeforetheflareinthecollisionsitepenumbra.Subsequently,thepolarityinversionlineatthecollisionsitebecameverycomplicated.ThenumberofbrightloopsinCaIIHincreasedduringtheformationoftheseelongatedmagneticstructures.Flareribbonsandbrightloopsevolvedalongthepolarityinversionlineandonefootpointofthebrightloopwaslocatedinaregionhavingalargedepartureofthefieldazimuthanglewithrespecttoitssurroundings.SOTobservationswithhighspatialresolutionandhighpolarizationprecisionrevealedtemporalchangeinthefinestructureofmagneticfieldsattheflaresite:somepartsofthecomplicatedpolarityinversionlinethendisappeared,andinthoseregionstheazimuthangleofthephotosphericmagneticfieldchangedbyabout90°,becomingmorespatiallyuniformwithinthecollisionsite.

[学科分类] 天文学(综合)

[关键词] "Sun: flares";"Sun: magnetic fields";"Sun: photosphere";sunspots