Diagnostics of Radio Fine Structures around 3 GHz with Hinode Data in the Impulsive Phase of an X3.4/4B Flare Event on 2006 December 13

[摘要] On2006December13duringthesolarminimum,thesuperactiveregionNOAA10930attheS05W33disklocationproducedanX3.4/4Bflareat02:40UT.Finestructureswereobservedintheradiospectra,whichincludedspikes,reverseslope-typeIIIbursts,type-Uburst,V-shapedburst,pulsations,zebrapatterns,andfirstlydiscoveredsub-secondspikyzebra-likestructures,superimposedonthe2.6–3.8 GHztypeIVbursts.Theradiofinestructuresduringtheimpulsivephaseoftheflaremaybecloselyassociatedwithcoronalstructuresduringthemagnetic-reconnectionprocess,asrevealedbyHinodesoftX-rayimages.Thus,thesemicrowavefinestructureobservationsmayprovideveryusefuldiagnosticsattheprimaryenergyreleasesiteswhentheyoccurintheimpulsiveflarephase.Forthisflareevent,theestimatedcoronalmagneticfieldisabout50–170Gintherisingphaseoftheflarewithasourcedensityofabout1$$imes$$10$$^{11}$$cm$$^{-3}$$.Thefieldstrengthandplasmadensityareabout90–200Gand1.27$$imes$$10$$^{11}$$cm$$^{-3}$$aroundtheflaremaximum.

[学科分类] 天文学(综合)

[关键词] "coronal magnetic field";"radio fine structures";"solar flares";"solar radio bursts";"Sun: radio emission"