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Height dependence of the amplitudes of solar oscillations viewed with a potassium resonance scattering spectrometer

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Abstract

Over the course of the year, the variation in the solar line-of-sight velocity causes a change in the heights in the photosphere which are analysed by the red and blue passbands of a resonance scattering spectrometer. This in turn would be expected to produce a variation in the ratio of acoustic amplitudes measured in each passband. Using data from the Tenerife spectrometer of the Birmingham Solar Oscillations Network (BiSON), we demonstrate such a seasonal change. We then use the Eddington-Barbier approximation and an atmospheric model to convert the magnitude of this trend in velocity ratio with line-of-sight velocity into an approximate value of 580 km for the velocity-amplitude scale height. However, a simple argument suggests that ‘Doppler imaging’ causes this to be an overestimate of the true value.

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Authors and Affiliations

  1. School of Physics and Space Research, University of Birmingham, B15 2TT, Edgbaston, Birmingham, U.K.

    Christopher J. Underhill & Clive C. Speake

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  1. Christopher J. Underhill
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  2. Clive C. Speake
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Underhill, C.J., Speake, C.C. Height dependence of the amplitudes of solar oscillations viewed with a potassium resonance scattering spectrometer. Sol Phys 163, 231–240 (1996). https://doi.org/10.1007/BF00147997

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  • DOI: https://doi.org/10.1007/BF00147997

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