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This was not a
particulary strong flare, but under special observation in H-alpha. The BBSO
(Haimin) made a particulary high resolution H-alpha observations. Originally
meant to study the elementary bursts. The elementary bursts is like a quantum
of the energy release process. How small & how fast are unknown,
therefore requires as fastest and
most detail images as possible. We
then adapted the data to other purpose, as typical in solar study: I.e. test
the reconnection theory (usually known as Kopp&Pneuman model for erupting
filament) and particle acceleration in DC electric fields. (a) H-alpha and
radio contours, (b) magnetogram, © HXR/yohkoh., Conclusion. In favor of the
DC field acceleration model. (The electric field is strenght was kind of too
high, compared with previous speculation—just a result of increased
time/spatial resolution)
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