Journal
ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 58
Volume 58, Issue -, Pages 441-481Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-astro-032320-042940
Keywords
Sun: corona; Sun: oscillations; waves
Categories
Funding
- Science and Technology Facilities Council [ST/T000252/1]
- BK21 PLUS program through the National Research Foundation - Ministry of Education of Korea
- Russian Foundation for Basic Research grant [18-29-21016]
- Basic Research program II.16
- STFC [ST/T000252/1] Funding Source: UKRI
Ask authors/readers for more resources
The corona of the Sun is a unique environment in which magnetohydrodynamic (MHD) waves, one of the fundamental processes of plasma astrophysics, are open to a direct study. There is striking progress in both observational and theoretical research of MHD wave processes in the corona, with the main recent achievements summarized as follows: Both periods and wavelengths of the principalMHD modes of coronal plasma structures, such as kink, slow and sausage modes, are confidently resolved. Scalings of various parameters of detected waves and waveguiding plasma structures allow for the validation of theoretical models. In particular, kink oscillation period scales linearly with the length of the oscillating coronal loop, clearly indicating that they are eigenmodes of the loop. Damping of decaying kink and standing slow oscillations depends on the oscillation amplitudes, demonstrating the importance of nonlinear damping. The dominant excitation mechanism for decaying kink oscillations is associated with magnetized plasma eruptions. Propagating slow waves are caused by the leakage of chromospheric oscillations. Fast wave trains could be formed by waveguide dispersion. The knowledge gained in the study of coronal MHD waves provides ground for seismological probing of coronal plasma parameters, such as the Alfven speed, the magnetic field and its topology, stratification, temperature, fine structuring, polytropic index, and transport coefficients.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available