Journal
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume 364, Issue 1839, Pages 313-331Publisher
ROYAL SOC
DOI: 10.1098/rsta.2005.1701
Keywords
Sun; magnetic fields-sunspots-Sun; helioseismology
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Oscillatory phenomena observed in sunspot umbrae and penumbrae are reviewed and critically discussed. A natural interplay between the thermal atmospheric stratification and the ordered collimation imposed by the intense magnetic field leads naturally to the characteristic properties of the umbral chromospheric and photospheric oscillations and their interpretation as low-beta (beta=8-pi p/B-2) slow magneto-acoustic-gravity waves guided along the ambient magnetic field.
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