Umbral oscillations and penumbral waves in H alpha

Details Umbral oscillations and penumbral waves in H alpha Umbral oscillations and penumbral waves in H alpha

Mar 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...41...81m&link_type=abstract

Solar Physics, vol. 41, Mar. 1975, p. 81-88.

Physics

16

H Alpha Line, Penumbras, Sunspots, Umbras, Wave Propagation, Filtergrams, Oscillations, Solar Atmosphere, Solar Magnetic Field, Solar Spectra, Spectroheliographs, Velocity Distribution

Scientific paper

Examples are presented of umbral oscillations observed on Big Bear H-alpha filtergram movies, and the relation between umbral oscillations and running penumbral waves occurring in the same sunspot is investigated. Umbral oscillations near the center of the umbra are probably physically independent of the penumbral waves because the period of these umbral oscillations (150 sec) is shorter than the penumbral wave period (270 sec), but not a harmonic. Dark puffs emerge from the edge of the umbra and move outward across the penumbra, and have the same period as the running penumbral waves. These dark puffs are interpreted to be the extension of chromospheric umbral oscillations at the edge of the umbra. It is suggested that the dark puffs and the running penumbral waves have a common source: photospheric oscillations just inside the umbra.

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