Ephemeral Active Regions
Abstract
Ephemeral active regions attain maximum development within 1 day or less of their initial appearance and are typically observed for 1-2 days. They appear mostly as small bipolar regions having a typical dimension of about 30000 km and a maximum total flux of the order of 1020 Mx. The ephemeral regions generally do not produce sunspots and flares, though they are identified in Hα as small active centers.
- Publication:
-
Solar Physics
- Pub Date:
- October 1973
- DOI:
- 10.1007/BF00154951
- Bibcode:
- 1973SoPh...32..389H
- Keywords:
-
- Flare;
- Active Region;
- Active Center;
- Typical Dimension;
- Total Flux