Observations of Magnetic Field Reconnection at the Base of EFR Surges

Liu Yu)

. Brief Review of Surge StudyRoy(1973)surge: Chromospheric explosion:

(1) Satellite Polarity: Rust(1968): IAU symp. Vol.35, 77

(2) Evoluving magnetic feature: Roy(1973): S.P.28, 951412UT1913UT2046UTH+1.4H-2H-0.9HH+1.4H-0.6H+0.6

(3) Emerging Flux Region:EFR surge surgeKurokawa and Kawai(1993):IAU Colloq.Kurokawa(1988):2015UTBBSO2047UTBBSO83/6/16/20050UTHida0053UTHIdaContinuum0221UTHidaH+0.80605UTHida

2240UTSurge is the first manifestation of the birth of an active regionKurokawa(2005)H centerH centerH centerMagneticfieldMagneticfield

MagneticfieldCaline wingintensityCaline wingintensity

Big Bear Solar Observatory

EFR-surge (kurokawa and Kawai 1993)EFRelementary surgeHblue-wingHred-wingEFRSurge

Hsurge: EFR(Kurokawa and Kawai 1993)

Soft X-ray Jet (Yohkoh SXT)shibata et al. (1992) Shimojo et al. (1996) Yokoyama and Shibata(1996)EFR

Surge

Detailed comparison between Hida H and Huairou Magnetogram

Flux changes of the isolated magnetic polarity near the footpoint of the H surge

Correction of errors included in the raw data(1)(2)(3)Magnetic flux change: increase

Summary of Flux Changes in the Surge RegionsSurgeEFR is essential for surge!

High resolution observation ofthe footpoints of HsurgesBrooks, Kurokawa and Burger(2005)With Lockheed SOUP and Swedish 50cm telescope at La PalmaTRACE171 magnetic fieldH-0.7H+0.7. Solar B

TRACE171contour on the H-0.7at 14:07 UTTRACE171contour on the magnetogram at 14:08UTH-0.7imagesTRACE171imagesHot coronal plasma observed in Fe171 at the base of an HsurgeEvidence of reconnection

Before reconnectionAfter reconnectionEFRSchematic model of the surge of 30 May, 1998

Changes of transverse field at the surge base Liu and Kurokawa(2004:Ap.J. 610, 1136)30Aug,2001Surge

(1)Transient appearance of transverse magnetic field during the surge activity(2) Formation of transverse field after the surge activity? (Liu and Kurokawa 2004)surgeafter surgeFormation of two types of transverse magnetic field

. Solar BHdark surge, Hbright point, XRT-hot reconnected loop, -evaporation jet transeverse

Surge SMART(Solar Magnetic ActivityResearch Telescope) at Hida ObservatoryDSTSMART