Abstract
Imaging observations of solar flare hard X-ray sources with the Hard X-ray Telescope aboard the Yohkoh satellite have revealed that hard X-ray emissions (>30 keV) originate most frequently from double sources. The double sources are located on both sides of the magnetic neutral line, suggesting that the bulk of hard X-rays is emitted from footpoints of flaring magnetic loops. We also found that hard X-rays from the double sources are emitted simultaneously within a fraction of second and that the weaker source tends to be located in the stronger magnetic field region, showing a softer spectrum. Physical implications on the observed characteristics of the hard X-ray double sources are discussed.
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