High-speed photospheric material flow observed at the polarity inversion line of a δ-type sunspot producing an X5.4 flare on 2012 March 7

Publications of the Astronomical Society of Japan

Bamba, Yumi³  Shimizu, Toshifumi²  Lites, Bruce W.¹ 

[1] High Altitude Observatory, National Center for Atmospheric Research,† P.O.Box 3000, Boulder, CO 80307, USA;Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan;Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, JapanSolar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan

关键词: "Sun: evolution";    "Sun: flares";    "Sun: magnetic fields";    "Sun: photosphere";    sunspots;   

DOI  :  10.1093/pasj/psu089

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Solarflaresabruptlyreleasethefreeenergystoredasanon-potentialmagneticfieldinthecoronaandmaybeaccompaniedbyeruptionsofthecoronalplasma.Formationofanon-potentialmagneticfieldandthemechanismsfortriggeringtheonsetofflaresarestillpoorlyunderstood.Inparticular,photosphericdynamicsobservednearthosepolarityinversionlinesthataresitesofmajorflareproductionhavenotbeenwellobservedwithhighspatialresolutionspectro-polarimetry.Thispaperreportsonaremarkablehigh-speedmaterialflowobservedalongthepolarityinversionlinelocatedbetweenflareribbonsatthemainenergyreleasesideofanX5.4flareon2012March7.Observationswerecarriedoutbythespectro-polarimeteroftheSolarOpticalTelescopeonboardHinode.Thehigh-speedmaterialflowwasobservedinthehorizontallyorientedmagneticfieldformednearlyparalleltothepolarityinversionline.Thisflowpersistedfromatleastsixhoursbeforetheonsetoftheflare,andcontinuedforatleastseveralhoursaftertheonsetoftheflare.Observationssuggestthattheobservedmaterialflowrepresentsneithertheemergencenorconvergenceofthemagneticflux.Rather,itmaybeconsideredtobematerialflowworkingbothtoincreasethemagneticshearalongthepolarityinversionlineandtodevelopmagneticstructuresfavorablefortheonsetoftheeruptiveflare.

【 授权许可】

Unknown