The photospheric Poynting flux and coronal heating

Welsch Brian T.

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The photospheric Poynting flux and coronal heating

机译：光球坡印通量和日冕加热

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Somemodelsofcoronalheatingsupposethatconvectivemotionsatthephotosphereshufflethefootpointsofcoronalmagneticfieldsandtherebyinjectsufficientmagneticenergyupwardtoaccountforobservedcoronalandchromosphericenergylossesinactiveregions.Usinghigh-resolutionobservationsofplagemagneticfieldsmadewiththeSolarOpticalTelescopeaboardtheHinodesatellite,weinvestigatethisideabyestimatingtheupwardtransportofmagneticenergya€”theverticalPoyntingflux,Sza€”acrossthephotosphereinaplageregion.Todoso,wecombinethefollowing:(i)estimatesofphotospherichorizontalvelocities,vh,determinedbylocalcorrelationtrackingappliedtoasequenceofline-of-sightmagneticfieldmapsfromtheNarrowbandFilterImager,with(ii)avectormagneticfieldmeasurementfromtheSpectroPolarimeter.Plagefieldsareidealobservationaltargetsforestimatingenergyinjectionbyconvection,becausetheyare(i)strongenoughtobemeasuredwithrelativelysmalluncertainties,(ii)notsostrongthatconvectionisheavilysuppressed(aswithinumbrae),and(iii)unipolar,soSzinplageisnotinfluencedbymixed-polarityprocesses(e.g.,fluxemergence)unrelatedtoheatinginstable,active-regionfields.Inthisplageregion,wefoundthattheaverageSzvariedinspace,butwaspositive(upward)andsufficienttoexplaincoronalheating,withvaluesnear(5a€‰?±a€‰1)a€‰?—a€‰107a€‰erga€‰cma?’2a€‰sa?’1.Wefindtheenergyinputperunitmagneticfluxtobeontheorderof105a€‰erga€‰sa?’1a€‰Mxa?’1.AcomparisonofintensityinaCaa€‰iiimageco-registeredwithoneplagemagnetogramshowsstrongerspatialcorrelationswithbothtotalfieldstrengthandunsignedverticalfield,|Bz|,thaneitherSzorhorizontalfluxdensity,Bh.TheobservedCaa€‰iibrightnessenhancement,however,probablycontainsastrongcontributionfromanear-photospherehot-walleffect,whichisunrelatedtoheatinginthesolaratmosphere.

机译：Somemodelsofcoronalheatingsupposethatconvectivemotionsatthephotosphereshufflethefootpointsofcoronalmagneticfieldsandtherebyinjectsufficientmagneticenergyupwardtoaccountforobservedcoronalandchromosphericenergylossesinactiveregions.Usinghigh-resolutionobservationsofplagemagneticfieldsmadewiththeSolarOpticalTelescopeaboardtheHinodesatellite，weinvestigatethisideabyestimatingtheupwardtransportofmagneticenergya€” theverticalPoyntingflux，SZA€” acrossthephotosphereinaplageregion.Todoso，wecombinethefollowing：（ⅰ）estimatesofphotospherichorizontalvelocities，VH，determinedbylocalcorrelationtrackingappliedtoasequenceofline-的-sightmagneticfieldmapsfromtheNarrowbandFilterImager，与（ⅱ）avectormagneticfieldmeasurementfromtheSpectroPolarimeter.Plagefieldsareidealobservationaltargetsforestimatingenergyinjectionbyconvection，becausetheyare（ⅰ）strongenoughtobemeasuredwithrelativelysmalluncertainties，（II）强度不足以使对流严重受抑制（如带雨伞），并且（iii）单极对流，因此对Szinplage的影响不大固定极性的过程（例如，发热量）与稳定的活动区域中的加热无关。在该杂物区域中，我们发现空间中的平均Sz变量，但正向（向上）且足以解释日冕加热，其值接近（5a€±a€‰1）a€‰。 cma？'2a？sa？'1。将每单位磁通量的能量输入按105a？ergasa？'1a？Mxa？'1的顺序确定。在caa上的强度对比图像显示，每单位磁场的功率密度与垂直度成正比，两者的总和都与磁场强度成正比。可能来自光球热壁效应的强贡献，这与孤岛大气的加热无关。

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《PASJ: Publications of the Astronomical Society of Japan》 |2015年第2期|共页
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Welsch Brian T.;
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1. The photospheric Poynting flux and coronal heating [J] . Welsch Brian T. PASJ: Publications of the Astronomical Society of Japan . 2015,第2期

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2. POYNTING-FLUX-DOMINATED JETS CHALLENGED BY THEIR PHOTOSPHERIC EMISSION [J] . D. Bégué124, A. Peer3 The Astrophysical journal . 2015,第2期

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3. Mechanisms for mhd poynting flux generation in simulations of solar photospheric magnetoconvection [J] . Shelyag S., Mathioudakis M., Keenan F.P. The Astrophysical Journal. Letters . 2012,第1期

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4. Poynting flux dominated jets challenged by their photospheric emission [C] . Damien Bégué ICRANet César Lattes Meeting . 2015

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5. Coupling the photospheric and coronal magnetic fields: Observations and analysis. [D] . Handy, Brian Neal. 1998

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6. Correlation between Poynting flux and soft electron precipitation in the dayside polar cap boundary regions [O] . Yue Deng, Cheng Sheng, Yi‐Jiun Su, -1

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7. The Photospheric Poynting Flux and Coronal Heating [O] . B. T. Welsch 2016

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8. Simulations of Emerging Magnetic Flux. II. The Formation of Unstable Coronal Flux Ropes and the Initiation of Coronal Mass Ejections. [R] . Leake, J. E., Linton, M. G., Antiochos, S. K. 2014

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The photospheric Poynting flux and coronal heating

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