Contribution and Properties of the Green- and Red-Line Coronal Loops in the K-Corona

[摘要] Asetofhigh-resolutionimagesofcoronaobtainedduringthetotalsolareclipseon1991July11,wascarefullyanalyzedtoinvestigatethepropertiesoftheloopstructuresobservedinthegreen(530.3nm)andred(637.4nm)emissionlinesandinthecontinuum.Withthehelpofastructure-enhancementalgorithm,wehavequantitativelyshownthat:(1)Thegreen-andred-lineloopsarequiteseparatelydistributedinspace.(2)Formoststructuresseeninthecontinuumintheactive-regioncorona,componentscanbeidentifiedinthegreenorredline.(3)Intheinnermostcorona,structuresinthered-linetendtocontributemoretothetotalcolumndensitythanthegreen-linestructures.Wepresenttwoschematicmodelstoexplainthespatialrelationofthegreen-line,thered-line,andthecontinuumloops.Next,westudiedindividualloopsinthegreenandredlines,andderivethattheirelectrondensitiesarealmostthesame.Wealsoproposeamethodtodeterminethe‘backgroundcontribution’ofthegreenandredlinestothetotalcolumndensityderivedfromthecontinuumintensity.Itisfoundthatthetotalcolumndensityintheanalyzedregioncanbereasonablyexplainedbyamixtureofthe530.3nmcomponentwithaline-of-sightlengthcomparabletothesizeoftheactiveregion,andthe637.4nmcomponent,whichtendstoconcentrateinloopstructures.Wetherebyconcludethattheobservedcoronaiswellexplainedbyaplasmaoftemperaturesrangingfrom2MKto1MK.

[学科分类] 天文学(综合)

[关键词] "methods: data analysis";"techniques: image processing";"techniques: photometric";"Sun: corona";"Solar eclipses"