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| Paper: |
Emergence of Twisted Flux in Prominence Observations |
| Volume: |
455, 4th Hinode Science Meeting: Unsolved Problems and Recent Insights |
| Page: |
123 |
| Authors: |
Okamoto, T. J.; Tsuneta, S.; Berger, T. E.; Lites, B. W. |
| Abstract: |
The emergence of twisted flux is a key process for supply of magnetic
flux into the corona as well as solar dynamic activities such as
sunspot formation and trigger of coronal mass ejections. In
particular, there are numerous discussions about the role and
necessity of twisted flux emergence for origin of
prominences. However, the difficulty to measure vector magnetic fields
has not allowed us to investigate the detailed relationship between
emerging twisted flux and prominence. Hinode has changed the
situation. The Spectro-Polarimeter aboard Hinode has high
sensitivity to weaker magnetic fields of fine structures, and provides
opportunities to detect weak horizontal magnetic fields. As a result,
we have obtained signatures of twisted flux emergence associated with
prominences: The observational features are "broadening and narrowing
of a region dominated by horizontal magnetic field" and "rotating
direction of horizontal field" on the photosphere. Moreover, the data
show the interaction between the emerging twisted flux and granules,
and that the flux rope has high intrinsic strength 650 G, while the
flux density is as low as 100 G. Theoretical research with numerical
simulation on the basis of these results is active. In addition, we
investigate activities of a coronal cavity overlying a prominence on
the limb, and suggest the existence of twisted flux rope to explain
the activities of prominence and the coronal cavity
comprehensively. Here we introduce both these observational and
theoretical results, and discuss the details about emerging twisted
flux. |
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