Oscillations in a rapidly developing sunspot according to measurements of H and K CA II lines

Details Oscillations in a rapidly developing sunspot according to measurements of H and K CA II lines Oscillations in a rapidly developing sunspot according to measurements of H and K CA II lines

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989kfnt....5...69t&link_type=abstract

Kinematika i Fizika Nebesnykh Tel (ISSN 0233-7665), vol. 5, July-Aug. 1989, p. 69-75. In Russian.

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1

H Lines, K Lines, Solar Oscillations, Sunspots, Calcium, Chromosphere, Power Spectra, Solar Spectra, Umbras

Scientific paper

Velocity and intensity oscillations in the umbra of a sunpot (leader of group 1982 observed on May 28, 1982) were measured in the chromospheric H and K II lines. Power spectra calculated for nine locations along the umbra show the predominance of 5-min oscillations in one part of the umbra and the presence of oscillations with periods of about 3 min and 80 sec in another part. The observed phenomenon appears to be an intermediate process between umbral flashes and chromospheric velocity oscillations.

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