Since their discovery, velocity oscillations in the lower solar atmosphere have been observed to interact with magnetic fields. The nature of this interaction, and the mechanisms that channel the energy to the upper layers, represent a crucial issue for the corona heating. In this work, we use SDO dopplergrams and magnetograms of 12 bipolar active regions (beta ARs) to study the relation between velocity oscillation amplitude and magnetic field. We find that the velocity oscillation amplitude depends not only on the magnetic field strength, but also on its polarity.
Memorie della Societa Astronomica Italiana
- Pub Date:
- Sun: oscillations