Physics
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...58..347g&link_type=abstract
Solar Physics, vol. 58, July 1978, p. 347-361.
Physics
17
H Alpha Line, Light Scattering, Photosphere, Solar Magnetic Field, Sunspots, Acoustic Propagation, H Gamma Line, Magnetic Control, Magnetic Effects, Magnetic Recording, Magnetometers
Scientific paper
The line-center magnetogram technique was used to study velocities at spatial scales of approximately 5 sec in several umbras without interference from light scattered from the surrounding nonmagnetic photosphere. In H-alpha there are umbral intensity variations whose maxima at Delta lambda = plus or minus 0.39 A occur simultaneously with downward velocity maxima measured at the same Delta lambda. For about one-quarter of the observations it is possible to match the H-alpha and 5233-A waveforms: velocities in the latter lead those in H-alpha by 27 sec on the average, also indicating outward wave propagation and, at the velocity of sound, a difference in the mean heights of formation of about 150 km. The estimated outward wave flux for the spatial scales studied is much less than 3 x 10 to the 6th ergs/sq cm/sec at the 5233-A level, much lower than previous estimates and far too low to produce any significant cooling.
Giovanelli R. G.
Harvey Jack W.
Livingston William Charles
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