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1、Three-dimensionalDistributionoftheEscapePhotonsofHαFlaresChin.J.Astron.Astrophys.Vo1.6(2006),No.1,87-95(http://www.chjaa.org)ChineseJournalofAstronomyandAstrophysicsThree—dimensionalDistributionoftheEscapePhotonsofHaFlaresMing—GuoSun,3,Zhong—QuanQu,ZhiXu2,Xiao—YuZhang,Cheng—LinXu,3,Shuai
2、Wangl,andChun—LanJinl,YunnanAstronomicalObservatory/NationalAstronomicalObservatories,ChineseAcademyofSciences.Kunming650011;sunmg@ynao.ac.c佗DepartmentofAstronomy,NanjingUniversity,Nanjing210093GraduateUniversityoftheChineseAcademyofSciences,Beijing100049Received2004July22;accepted2005Ju
3、ly26AbstractAtechniqueforobtainingathreedimensionaldistributionofreceivedpho-tonsinHflaresinthesolaratmosphereispresented.Itiswellknownthatduringflareshydrogenatomsinthechromosphereandphotosphereareexcitedfevenionized1bythedownwardheatingofnon-thermalparticlesandthenemitHphotons.Wletrace
4、backtheseHphotonstotheiroriginallayersbyuseofthecontributionrune-tioninthetheoryofspectrallineformation.andsoacquiretheirthree-dimensionalf3D1distribution.Thistechniqueisappliedtothetwo-ribbonflareof2002January20.Theatmosphericmodelsareobtainedbyfittingthe"quasi—profiles"withthehelpofthe
5、generallyusedmodelatmospheres.Sincethevarietyofthe3Dimagesreflectstheresponseoftheatmosphericlayerstotheimpactofenergytransport,ananalysisofthedevelopmentoftheflareisgiventhroughacomparisonofthe3Dimageswiththe2Dtemperaturedistribution.Keywords:line:formation——radiativetransfer——sun:flare
6、s1INTRoDUCTIoNSolarflaresarewidelybelievedtooriginatefrommagneticreconnectioninthecorona.Duringaflareeruptionalargeamountofenergyistransporteddownwardbyhigh—energyparticlessuchaselectrons,protons,andions.etc.,andbyirradiationandheatconduction.Thisprocesshasattractedmanyresearchersinsolar
7、physicsandmanyofitsaspectshavebeenexplored,forinstance,theenergybudgetthemechanismofenergyrelease,theaccelerationoftheelectrons,protonsandionsfTandberg-Hanssen&Emslie1988;Asai2003),thenon-thermalprocessesoftheseparticles(especiallybyelectrons)(Hudson1972;Lin&Hudso
