Tracking supergranulation near the poles with SDO/HMI
Abstract
Due to the spherical curvature of the Sun, solar observers suffer from an increasing loss of resolution as we move away from the solar equator. Thus knowledge of the photospheric flows near the poles has eluded the scope of traditional flow tracking algorithms that are using granules as tracers of the underlying flows. Using the new "Balltracking" framework which we adapted to the observations from SDO/HMI, we present an unprecedented analysis of the horizontal flow fields at latitudes beyond +/- 60 degrees. The flow fields are derived every 4 hours at a spatial resolution of 4 Mm. Using flow segmentation techniques, we extract geometric and spectral information on the supergranular cells and compare them with those of the supergranulation at lower latitude. The correlation with the dynamics of moving magnetic features is also investigated.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMSH13B..01A
- Keywords:
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- 7599 General or miscellaneous;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMY;
- 7899 General or miscellaneous;
- SPACE PLASMA PHYSICS;
- 7999 General or miscellaneous;
- SPACE WEATHER