Change in Sunspot Proper Motion and Its Relation to Flare
Onset
Y. Suematsu (NAOJ) and C.Y. Yatini (LAPAN)
From the detailed measurements of motion of sunspots in six
active regions, we found that some spots, which are located
on flaring area, underwent a particular motion when compared
with other spots in the same active region. These spots
showed a 'turn' in their moving direction before flare started.
The change in motion started in 0.5 to 2.5 hours before flare
onset. We found the relation
that if the spot shows a 'particular'motion, a flare occurs on
this particular spot region. On the
other hand, any sunspots in non-flaring active region do not show
peculiar motion. In some cases, the particular spots also show
the motion consistent with a rising emerging flux tube in which
pair of spots move away from each other. It is likely that the
peculiar motion of spots implies the rising motion of flux tube
perturbed by unknown reason. From this study, we expect that
SOLAR-B/SOT will be able to reveal the detailed relation between
the sunspot motion, related magnetic activity and flare onset,
making a short term prediction of flare occurrence possible.
Correspondence
Y. Suematsu (suematsu@solar.mtk.nao.ac.jp), NAOJ
presentation
poster