Multi-Wavelength Studies of Flare Activities with Solar-BASAI AyumiKwasan Observatory, Kyoto University

Solar-B Science Meeting@ISASFebruary 4, 2003

Magnetic Reconnection ModelMagnetic Reconnectionelemental process for solar flaresTo solve the mechanism, quantitative studies are needed. Solar-Bs target

Todays TopicUsing various phenomena, we derive the information about the energy release via reconnection.I present the estimation of the energy release rate at flares, by multi-wavelength studies of flares.Analyzed flares2000-April-10 Flare (X2.3)2002-July-23 Flare (X4.8)2000-November-24 Flare (X2.3)Suggestion for the observations with Solar-B

Energy Release RateEnergy Release RateTime profiles of HXR and microwave intensities are well fitted with that of dE/dt Reconnection model indicatesBc : coronal magnetic field strengthvin : inflow velocityA : area of the reconnection regionI estimate the energy release rate, and compare it with nonthermal light curves.

DataObservational Data

HaKwasan Observatory, Sartorius Telescope

EUVTRACE (171, 195 image)

magnetogramSOHO / MDI

hard-X rayYohkoh / HXT RHESSI HXRS (Czech)

microwaveNobeyama RadioheliographSartorius Telescope

2001-April-10 FlareHa images taken with Sartorius TelescopeEastWestFlare I April 10, 2001 05:10 UT

GOES X2.3 classNOAA 9415

Features of the FlareMicrowave and HXR light curves show some bursts.

The spatial distributions of Ha kernels are different from those of HXR sources.Ha imageHXR sourcesHXTGOESNoRHSartorius

Evolution of Flare RibbonsNeutral LineI estimate the reconnection rate vB, and the Poynting flux vB2 as the representations of the energy release rates.

Reconnection Rate and Poynting FluxmicrowaveHXRreconnection ratePoynting fluxAn HXR burst occurred on the slit (05:19 UT).

Reconnection Rate and Poynting FluxmicrowaveHXRreconnection ratePoynting fluxAn HXR burst occurred on the slit (05:26 UT).

Summary II have estimated the energy release rate from the separation motions of Ha two ribbons and the photospheric magnetic field strengths.

The estimated reconnection rate and the Poynting flux along each slit show good correlation with nonthermal burst.

2002-July-23 FlareFlare II July 23, 2002 00:15 UT

GOES X4.8 class

NOAA 0039EUV(195) images taken with TRACEEastWest

Down FlowThe timings of the down flows correspond to microwave/HXR bursts.Time slice imageTRACE 195Amicrowave (NoRH 17GHz)

2000-November-24 FlareTime slice imageThis flare shows many plasmoid ejections, and each of them is ejected at the time corresponding to the HXR burst.Takasaki (2003)Yohkoh/SXT

Summary IIDown flow motions and plasmoid ejections show some correlations with HXR/microwave bursts. Strongly depend on the reconnection process.

More quantitative studies are still needed.

Observation with Solar-BSOT

XRT

EIS

collaboration with other satellite and ground based instruments Hida Obs., Nobeyama, RHESSIHa images with high spatial resolutionMagnetograms with high spatial resolutionObservation of reconnection outflow, and density and temperature of the plasmaVelocity field of the reconnection outflow