A model with a 1-D collapsing magnetic trap is proposed for an explanation of the motion of the X-ray loop-top source at the beginning of cusp-type flares. Considering plasma heating due to the betatron mechanism an analytic formula for the temporal and spatial evolution of heated plasma temperature in the trap is derived. Using the formula and the relation for thermal bremsstrahlung flux, the time evolution of the X-ray intensity profile in the trap is computed numerically. The model explains not only the downward motion of the X-ray loop-top source observed at the beginning of cusp-type flares, but also the upward motion which follows.
Central European Astrophysical Bulletin
- Pub Date:
- solar flares;
- heating processes;
- X-ray emission