Observations of longperiod mass velocity oscillations in the sun's chromosphere

Details Observations of longperiod mass velocity oscillations in the sun's chromosphere Observations of longperiod mass velocity oscillations in the sun's chromosphere

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..109..399b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 109, no. 2, 1987, p. 399-402.

Physics

7

Chromosphere, Solar Oscillations, Stellar Mass, Stellar Spectrophotometry, Velocity Distribution, H Beta Line, Line Of Sight, Solar Prominences

Scientific paper

Observations of line-of-sight velocity oscillations in the solar atmosphere obtained at the Sayan Observatory, USSR, with an automated horizontal solar telescope using the differential method of Kobanov (1983) are presented. The mass velocity oscillations for the chromosphere were recorded in the H-beta line, and for the underlying layers of the atmosphere the 4554 A line of Ba II and the 4875 A of Ni I were used. The velocity data are examined using the correlation periodogram analysis method of Kopecky and Kuklin (1971). It is observed that: (1) there are long-period oscillations (40-80 min) in the H-beta line; (2) there are no long-period oscillations in the 4554 A line of Ba II and the 4875 A line of Ni I; and (3) there are short-period oscillations in all three lines. The data reveal that the long-period oscillations, which increase in amplitude with distance from the center to the solar limb, may be caused by horizontal oscillations.

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