Deconvolution of Directly Precipitating and Trap-precipitating Electrons in Solar Flare Hard X-rays : Iii. Yohkoh Hxt Data Analysis

We analyze the footpoint separation d and ux asymmetry A of magnetically conjugate double footpoint sources in hard X-ray images from the Yohkoh Hard X-Ray Telescope (HXT). The dataset of 54 solar ares includes all events simultaneously observed with the COMPTON Gamma Ray Observatory (CGRO) in high-time resolution mode. From the CGRO data we deconvolved the direct-precipitation and trap-precipitation components previously (in paper II). Using the combined measurements from CGRO and HXT we develop an asymmetric trap model that allows us to quantify the relative fractions of four diierent electron components, i.e. the ratios of direct-precipitating (q P1 ; q P2) and trap-precipitating electrons (q T1 ; q T2) at both magnetically conjugate footpoints. We nd mean mean ratios of q P1 = 0:14 0:06, q P2 = 0:26 0:10, and q T = q T1 + q T2 = 0:60 0:13. We assume an isotropic pitch-angle distribution at the acceleration site and double-sided trap precipitation (q T2 =q T1 = q P2 =q P1) to determine the conjugate loss-cone angles (1 = 42 0 11 0 and 2 = 52 0 10 0) and magnetic displacement of footpoint sources we measure also altitude diierences of HXR emission at diierent energies, which are found to decrease systematically with higher energies, with a statistical height diierence of h Lo ? h M1 = 980 250 km and h M1 ? h M2 = 310 300 km between the 3 lower HXT energy channels (L0, M1, M2).