Hi-C and AIA observations of transverse magnetohydrodynamic waves in active regions
Abstract
The recent launch of the High resolution Coronal imager (Hi-C) provided a unique opportunity of studying the EUV corona with unprecedented spatial resolution. We utilize these observations to investigate the properties of low-frequency (50-200 s) active region transverse waves, whose omnipresence had been suggested previously. The five-fold improvement in spatial resolution over SDO/AIA reveals coronal loops with widths 150-310 km and that these loops support transverse waves with displacement amplitudes <50 km. However, the results suggest that wave activity in the coronal loops is of low energy, with typical velocity amplitudes <3 km s-1. An extended time-series of SDO data suggests that low-energy wave behaviour is typical of the coronal structures both before and after the Hi-C observations.
Appendix A and five movies associated to Figs. A.2-A.6 are available in electronic form at http://www.aanda.org- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 2013
- DOI:
- 10.1051/0004-6361/201321465
- arXiv:
- arXiv:1305.0140
- Bibcode:
- 2013A&A...553L..10M
- Keywords:
-
- Sun: corona;
- Sun: chromosphere;
- waves;
- magnetohydrodynamics (MHD);
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 8 pages,4 figures - published in Astronomy and Astrophysics Letters