1: Multi-wavelength flare studies - the HXR, (E)UV and Magnetic signatures
of large flares.
Initial imaging studies with Yohkoh HXT, MDI and TRACE have shown strong
spatial and temporal correlations between EUV flare and HXR footpoints,
with the correlation improving with increasing HXR mean photon energy. EUV
footpoint emission may be used to confirm RHESSI sources and thus better
understand the overall geometry of the flare. Cautious incorporation of
magnetograms and magnetic field extrapolations can further illuminate pre-
and post-flare magnetic connections and may shed light on the reason why
one particular set of field lines is the recipient of the bulk of the
accelerated electrons. EUV spectral information (line shifts, broadenings,
density diagnostics) can also be studied in a few events, using SoHO/CDS
data.
2. Comparison of stochastic simulations of particle transport with RHESSI
spatial and spectral signatures.
Monte Carlo simulations of electron beam transport provide a framework for
investigating the effects of scattering, field convergence, wave
generation etc on the beam distribution. Simulations can be run for
coronal magnetic geometries too complicated to describe with analytic
models. Detailed distribution functions in time, energy and position can
be built up and folded through the RHESSI detector responses to generate
images/lightcurves for comparison with RHESSI results.