Particle Acceleration Constraints :
- Free magnetic energy during magnetic reconnection process
- Direct imaging of above-the-loop-top HXR sources (Masuda 1994)
- Electron time-of-flight localization s/L~1.5 (Aschwanden 1995)
- Conjugate footpoint constraints (Sakao 1994)
- Bi-directional electron beams (Aschwanden, Benz, & Schwartz 1993)
- Electron density at startfrequency of type III an bi-directional beams
           (Aschwanden & Benz, 1997)
The particle acceleration site is most
likely located in magnetic cusps
above (relaxed) SXR-bright flare loops