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Double coronal hard X-ray (HXR) sources are believed to be criticalobservational evidence of bi-directional energy release through magneticreconnection in a large-scale current sheet in solar ares. Here we present astudy on double coronal sources observed in both HXR and microwave regimes,revealing new characteristics distinct from earlier reports. This event isassociated with a footpoint-occulted X1.3-class flare (25 April 2014, startingat 00:17 UT) and a coronal mass ejection that are likely triggered by themagnetic breakout process, with the lower source extending upward from the topof the partially-occulted flare loops and the upper source co-incident withrapidly squeezing-in side lobes (at a speed of ~250 km/s on both sides). Theupper source can be identified at energies as high as 70-100 keV. The X-rayupper source is characterized by flux curves different from the lower source, aweak energy dependence of projected centroid altitude above 20 keV, a shorterduration and a HXR photon spectrum slightly-harder than those of the lowersource. In addition, the microwave emission at 34 GHz also exhibits a similardouble source structure and the microwave spectra at both sources are in linewith gyro-synchrotron emission given by non- thermal energetic electrons. Theseobservations, especially the co-incidence of the very-fast squeezing-in motionof side lobes and the upper source, indicate that the upper source isassociated with (possibly caused by) this fast motion of arcades. This shedsnew lights on the origin of the corona double-source structure observed in bothHXRs and microwaves.

Double Coronal X-ray and Microwave Sources Associated With A Magnetic Breakout Solar Eruption