Evidence for large-scale oscillations of the solar photosphere

Details Evidence for large-scale oscillations of the solar photosphere Evidence for large-scale oscillations of the solar photosphere

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...193l..97f&link_type=abstract

Astrophysical Journal, vol. 193, Oct. 15, 1974, pt. 2, p. L97-L99.

Astronomy and Astrophysics

Astronomy

8

D Lines, Photosphere, Solar Atmosphere, Solar Spectra, Doppler Effect, Oscillations, Power Spectra, Radio Astronomy, Resonance, Sodium

Scientific paper

Doppler shifts of the Na D1 line, averaged over large solar areas up to the whole sun, have been recorded with a sodium resonance device. The power spectra of the observed fluctuations show that (1) the 5-minute oscillation has an horizontal coherence of 35,000 km at the level of the sodium line formation; (2) the corresponding peak at 3.3 mHz is not predominant for scales greater than 5'. New oscillations appear with a 10-minute period.

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