TY - JOUR T1 - Photospheric high-frequency acoustic power excess in sunspot umbra: signature of magneto-acoustic modes UR - http://eprints.whiterose.ac.uk/99764/ PY - 2009/09/29 AU - Zharkov S AU - Shelyag S AU - Fedun V AU - Erdélyi R AU - Thompson MJ ED - Y2 - 2024/12/25 ER -