Nature of Quiet Sun Oscillations Using Data from the Hinode, TRACE, and SOHO Spacecraft
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Abstract
We study the nature of quiet-Sun oscillations using multi-wavelength observations from TRACE, Hinode, and SOHO. The aim is to investigate the existence of propagating waves in the solar chromosphere and the transition region by analyzing the statistical distribution of power in different locations, e.g. in bright magnetic (network), bright non-magnetic and dark non-magnetic (inter-network) regions, separately. We use Fourier power and phase-difference techniques combined with a wavelet analysis. Two-dimensional Fourier power maps were constructed in the period bands 2 – 4 minutes, 4 – 6 minutes, 6 – 15 minutes, and beyond 15 minutes. We detect the presence of long-period oscillations with periods between 15 and 30 minutes in bright magnetic regions. These oscillations were detected from the chromosphere to the transition region. The Fourier power maps show that short-period powers are mainly concentrated in dark regions whereas long-period powers are concentrated in bright magnetic regions. This is the first report of long-period waves in quiet-Sun network regions. We suggest that the observed propagating oscillations are due to magnetoacoustic waves, which can be important for the heating of the solar atmosphere.
Keywords
Chromosphere, quiet Transition region Oscillations MHD wavesNotes
Acknowledgements
We thank the referee for their careful reading and valuable suggestions which has enabled us to improve the manuscript substantially. Research at Armagh Observatory is grant-aided by the N. Ireland Dept. of Culture, Arts and Leisure. We thank STFC for support via ST/J001082/1. The Transition Region and Coronal Explorer (TRACE) is a mission of the Stanford–Lockheed Institute for Space Research, and part of the NASA Small Explorer program. Hinode is a Japanese mission developed and launched by ISAS/JAXA, with NAOJ as domestic partner and NASA and STFC (UK) as international partners. It is operated by these agencies in co-operation with ESA and NSC (Norway).
Supplementary material
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