Hinode EUV Imaging Spectrometer Observations of Solar Active Region Dynamics
[摘要] TheEUVImagingSpectrometer(EIS)ontheHinodesatelliteiscapableofmeasuringemissionlinecenterpositionsforGaussianlineprofilestoafractionofaspectralpixel,resultinginrelativesolarDoppler-shiftmeasurementswithanaccuracyofalessthanakms$$^{-1}$$forstronglines.Weshowanexampleoftheapplicationofthatcapabilitytoanactiveregionsit-and-stareobservationinwhichtheEISslitisplacedatonelocationontheSunandmanyexposuresaretakenwhilethespacecrafttrackingkeepsthesamesolarlocationwithintheslit.Fortheactiveregionexamined(NOAA10930),wefindthatsignificantintensityandDoppler-shiftfluctuationsasafunctionoftimearepresentatanumberoflocations.Thesefluctuationsappeartobesimilartothoseobservedinhigh-temperatureemissionlineswithotherspace-bornespectroscopicinstruments.Withitsincreasedsensitivityoverearlierspectrometersanditsabilitytoimagemanyemissionlinessimultaneously,EISshouldprovidesignificantnewconstraintsonDoppler-shiftoscillationsinthecorona.
[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: corona";"Sun: oscillations";"Sun: UV radiation" [时效性]
