Physical conditions within flare kernels Original Research Article

We have investigated the distribution of temperature and emission measure (T, EM) within flare coronal kernels. The data used consist of the soft and hard X-ray images of flares obtained onboard the Yohkoh using Soft and Hard X-ray Telescopes (SXT and HXT). The analysed maps of temperature and emission measure have been obtained using a pair of Al12 and Be119 images which signal ratio is the most sensitive to temperature for the flaring plasma. The SXT images have been deconvolved using the ANDRIL routine and the HXT images have been reconstructed using standard maximum entropy method (MEM). The flares selected for the analysis have been simple, behind the limb events for which we can undoubtably identify the isolated kernels located in the corona, partly occulted by the limb. We present the analysis of 5th October 1992 flare as an example. The importance of precise image coalignment is emphasised and the method of making the adjustment for limb occulted flares is presented.