Photospheric high-frequency acoustic power excess in sunspot umbra: signature of magneto-acoustic modes
We present observational evidence for the presence of MHD (magnetohydrodynamic) waves in the solar photosphere deduced from SOHO/MDI (Solar and Heliospheric Observatory/Michelson Doppler Imager) Dopplergram velocity observations. The magneto-acoustic perturbations are observed as acoustic power e...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2013-08-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/31/1357/2013/angeo-31-1357-2013.pdf |