Perturbations in the wave parameters near active regions
Abstract
The wave characteristics in magnetically quiet regions with a nearby active region are compared with those of quiet regions at the same solar disk positions, but with no nearby active regions. We search for perturbations in the wave characteristics as the solar acoustic oscillations are affected as they propagate inside the nearby sunspot. The wave parameters were derived from ring-diagram analysis of HMI/SDO data. We find perturbations in several parameters, specially in the amplitude, width and frequency. The frequency observed in a five-degree quiet tile seems to be smaller if there is an active region nearby than if there is not by as much as 6%. We also describe the level of anisotropy in these perturbations in relation to direction of the nearby sunspot.
- Publication:
-
SDO-3: Solar Dynamics and Magnetism from the Interior to the Atmosphere
- Pub Date:
- October 2011
- Bibcode:
- 2011sdmi.confE..84R
- Keywords:
-
- SDO;
- SDO-3;
- SDO 3;
- SDO Workshop;
- LWS/SDO-3/SOHO-26/GONG-2011 Workshop;
- Solar Dynamic Observatory