Volume 604, August 2017
|Number of page(s)||8|
|Published online||28 July 2017|
Search for torsional oscillations in isolated sunspots
1 Instituto de Astrofísica de Canarias, vía Láctea, 38205 La Laguna, Tenerife Spain
2 Universidad de La Laguna, Departamento de Astrofísica, 38206 La Laguna, Tenerife, Spain
3 High Altitude Observatory (NCAR), 3080 Center Green Dr., Boulder, CO 80301, USA
Received: 25 January 2016
Accepted: 13 April 2017
In this work we seek evidence for global torsional oscillations in alpha sunspots. We have used long time series of continuum intensity and magnetic field vector maps from the Helioseismic and Magnetic Imager (HMI) instrument on board the Solar Dynamics Observatory (SDO) spacecraft. The time series analysed here span the total disk passage of 25 isolated sunspots. We found no evidence of global long-term periodic oscillations in the azimuthal angle of the sunspot magnetic field within ~1 degree. This study could help us to understand the sunspot dynamics and its internal structure.
Key words: sunspots / Sun: magnetic fields / Sun: oscillations / Sun: photosphere
© ESO, 2017
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