| Issue |
A&A
Volume 604, August 2017
|
|
|---|---|---|
| Article Number | A36 | |
| Number of page(s) | 8 | |
| Section | The Sun | |
| DOI | https://doi.org/10.1051/0004-6361/201628187 | |
| 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
e-mail: abgm@iac.es
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.