Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206l.175m&link_type=abstract
Astrophysical Journal, vol. 206, June 15, 1976, pt. 2, p. L175-L178.
Astronomy and Astrophysics
Astrophysics
15
Chromosphere, Penumbras, Photosphere, Solar Atmosphere, Sunspots, H Alpha Line, Phase Velocity, Wave Propagation
Scientific paper
Simultaneous observations have been made of velocities in the chromosphere (in H-alpha) and in the photosphere (in the nonmagnetic Fe I line at 5526-A) of three sunspots. The results reveal waves propagating horizontally outward across the penumbra in the photosphere with about the same period as the running penumbral waves in H-alpha (250-290 s). The photospheric waves are more intermittent and have higher horizontal phase velocity (by a factor of 2 or more) than the chromospheric penumbral waves.
Musman Steven
Nye Alan H.
Thomas Jordan H.
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