Height dependence of the amplitudes of solar oscillations viewed with a potassium resonance scattering spectrometer |
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| Authors: | Christopher J Underhill Clive C Speake |
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| Institution: | (1) School of Physics and Space Research, University of Birmingham, B15 2TT Edgbaston, Birmingham, U.K. |
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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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