Coronal Dimming Observed with Hinode: Outflows Related to a Coronal Mass Ejection
[摘要] Coronaldimminghasbeenasignatureusedtodeterminethesourceofplasmathatformspartofacoronalmassejection(CME)formanyyears.GenerallydimmingisdetectedthroughimaginginstrumentssuchasSOHOEITbytakingdifferenceimages.Hinodetrackedactiveregion10930fromwhichtherewereaseriesofflares.WecombineddimmingobservationsfromEITwithHinodedatatoshowtheimpactofflaresandcoronalmassejectionsontheregionsurroundingtheflaringactiveregion,andwediscussevidencethattheeruptionresultedinaprolongedsteadyoutflowofmaterialfromthecorona.Thedimmingregionshowsclearstructurewithextendedloopswhosefootpointsarethesourceofthestrongestoutflow($$approx$$40kms$$^{-1}$$).ThisconfirmsthattheloopsthataredisruptedduringtheeventdoloseplasmaandhencearelikelytoformpartoftheCME.Thisisthefirsttimethevelocityofthecoronalplasmahasbeenmeasuredinanextendeddimmingregionawayfromtheflarecore.Inadditiontherewasaweakersteadyoutflowfromextended,faintloopsoutsidetheactiveregionbeforetheeruption,whichisalsolonglasting.Theseweredisturbedandthevelocityincreasedfollowingtheflare.Suchoutflowscouldbethesourceoftheslowsolarwind.
[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: activity";"Sun: coronal mass ejections (CMEs)";"Sun: flares";"Sun: UV radiation" [时效性]
