Active Regions. II: Mount Wilson 16997. A Small Spot with Big Flares
Abstract
We describe the great activity associated with Mount Wilson 16997, a single αp spot without plage that produced a number of large flares and developed into a substantial center. The activity was signalled by the emergence of f polarity and weak plage ahead of the spot on 24 September 1968 (although the region was already seen at the limb at the 22 September 1968 eclipse as a active center). A number of explosive flares with X-rays on the 25th were climaxed by a large flare a 0036 UT 26 September; the latter was associated with the splitting of the old spot and the emergence of a new one. The polarity axis rotated around to a normal configuration by the 29th, but a large flare occurred on that day, too.
- Publication:
-
Solar Physics
- Pub Date:
- October 1970
- DOI:
- 10.1007/BF00221319
- Bibcode:
- 1970SoPh...14..342Z
- Keywords:
-
- Magnetic Field;
- Explosive;
- Flare;
- Active Region;
- Active Center