Hi-C and AIA observations of transverse magnetohydrodynamic waves in active regions

Morton, Richard and McLaughlin, James (2013) Hi-C and AIA observations of transverse magnetohydrodynamic waves in active regions. Astronomy & Astrophysics, 553. L10. ISSN 0004-6361

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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.

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