The correlation among physical quantities in Masuda-type flares
as indicated from the magnetic reconnection model
M.Shimizu, K.Nishida, H.Takasaki, D.Shiota, K.Shibata
Masuda et al. (1994) discovered a hard X-ray (HXR) source
above a soft X-ray (SXR) loop in impulsive compact-loop flares.
After this discovery, Shibata et al. (1995) found that X-ray plasma
ejections
were associated with these flares and proposed that these phenomena are
well explained, if magnetic reconnection occurs above the loop, similar to
the classical model for two ribbon flares.
Using images taken by the soft X-ray telescope and the hard X-ray
telescope aboard Yohkoh, we searched for impulsive compact-loop flares
with a HXR source above a SXR loop and found seven examples
Then we examined the correlation among physical quantities in these flares,
such as the height of the HXR source above the SXR loop,
the apparent rise velocity of the SXR loop and the velocity of plasma
ejections.
Consequently, we found a positive correlation among these quantities,
as expected from the magnetic reconnection model (Shibata at al., 1995).
We will report this result from Yohkoh data analysis and discuss
quantitatively based reconnection model why the correlation is seen
in Masuda-type flares. Forthermore we will propose a way to measure
inflow velocity to reconnection point or reconnection rate from measurement
of such quantities.
Correspondence
M. Shimizu (shimizu@kusastro.kyoto-u.ac.jp), Kwasan Observatory, Kyoto University
presentation
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