Long-Lived Activity Complexes, their Kinetic Helicity, Lifetime, and Flare Activity
Abstract
We study long-lived activity complexes using stackplots of magnetic activity derived from NSO/SOLIS synoptic magnetograms. We focus on the kinetic helicity below the surface determined with ring-diagram analysis applied to full-disk Dopplergrams from SDO/HMI during Solar Cycle 24. The kinetic helicity of activity complexes follows the hemispheric helicity rule with mainly positive values in the southern hemisphere and negative ones in the northern hemisphere. To distinguish between active and quiet regions, we divide the data into subsets with high and low levels of activity and create stackplots of surface magnetic activity and subsurface kinetic helicity for each subset. The distribution of flares in a stackplot resembles closely that of the high-activity subset. The flare-productive locations in long-lived complexes produce, on average, the same number of flares as those of short-lived ones. However, long-lived complexes have a larger number of these locations and thus a higher flare-production rate than short-lived ones. We will present the latest results.
- Publication:
-
Solar Heliospheric and INterplanetary Environment (SHINE 2019)
- Pub Date:
- May 2019
- Bibcode:
- 2019shin.confE..53K