Hard X-ray Source Related with a Plasma Ejection in Solar Flares

S. Mausda (Nagoya Univ.)

In some impulsive solar flares which occur near the solar limb, 
a compact hard X-ray (HXR) source, so-called looptop impulsive source, 
is observed above the flare loop.  This indicates that the flare energy 
release, probably magnetic reconnection, takes place above the loop, 
and it is believed that this HXR source is closely related with the 
downward reconnection flow.  Is there any observational phenomenon 
related with the upward reconnection flow?

Recently, it is found in a few impulsive solar flares that a new type 
of compact HXR source is located well above the HXR looptop impulsive 
source.  In these events, a hot-plasma ejection is observed in soft X-rays, 
and the HXR source is located just at the lower edge of the ejection.  
This HXR source might be related with the upward reconnection flow.  
We summarize the characteristics of this HXR source and discuss how 
this source is created there.