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Abstract: Magnetic reconnection is believed to be the prime mechanism to trigger solarflares and accelerate electrons up to energies of MeV. In the classicaltwo-dimensional reconnection model, the separation motion of chromosphericribbons manifests the successive reconnection that takes place higher up in thecorona. Meanwhile, downward traveling energetic electrons bombard the densechromosphere and create hard X-ray HXR emissions, which provide a valuablediagnostic of electron acceleration. Analyses of ribbon dynamics and HXRspectrum have been carried out separately. In this Letter, we report a study ofthe comparison of reconnection electric field measured from ribbon motion andhardness spectral index of X-ray emission derived from X-ray spectrum. Oursurvey of the maximum average reconnection electric field and the minimumoverall spectral index for 13 two-ribbon flares show that they are stronglyanti-correlated. The former is also strongly correlated with flare magnitudemeasured using the peak flux of soft X-ray emissions. These provide strongsupport for electron acceleration models based on the electric field generatedat reconnecting current sheet during flares.



Autor: Chang Liu, Haimin Wang

Fuente: https://arxiv.org/







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