Parameterization of Inflows around Active Regions
Abstract
Using time-distance local helioseismology flow maps within 1 Mm of the solar photosphere, we detect inflows into active regions that vary in magnitude as a function of active region properties. These inflows, averaged over several hundred active regions, can be as strong as 30 m/s and stretch out as far as 30 degrees away from active region centroids. If active region neighborhoods are ignored, the solar cycle scale variation in background meridional flow diminishes to below 2 m/s. This implies that most variation in meridional flow is solely due to active region inflows while the background meridional flow stays nearly constant throughout the solar cycle. Using this newly derived background flow profile enables the analysis of flows around active regions in a comoving reference frame. We further parameterize the variation of active region inflow amplitude as a function of the properties of different active regions like total unsigned flux, tilt angle, etc. This would serve as an important input for solar dynamo and surface flux transport models.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2021
- Bibcode:
- 2021AGUFMSH54A..04M