A spectrophotometer for the study of long period solar photospheric oscillations

Details A spectrophotometer for the study of long period solar photospheric oscillations A spectrophotometer for the study of long period solar photospheric oscillations

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....50..221g&link_type=abstract

Astronomy and Astrophysics, vol. 50, no. 2, July 1976, p. 221-225.

Astronomy and Astrophysics

Astrophysics

19

Photosphere, Solar Spectra, Spectroheliographs, Spectrophotometers, Doppler Effect, Electrophotometers, Optical Resonance, Stellar Spectrophotometry

Scientific paper

The paper describes a sodium optical resonance photoelectric spectrophotometer for measuring the Doppler shifts of the Na D1 line in the solar photosphere. The photometer operates on the basis of absorption of the spectral windows corresponding to the sigma Zeeman components. Problems of sensitivity (photon noise, guiding, residual modulation due to clouds) are considered, and the optimization of the spectrophotometer for the study of long period photospheric oscillations is discussed. A sensitivity of 1 m/s is expected for a velocity field integrated over the spectral range 0-1 MHz.

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