Height dependence of the amplitudes of solar oscillations viewed with a potassium resonance scattering spectrometer
✍ Scribed by Christopher J. Underhill; Clive C. Speake
- Publisher
- Springer
- Year
- 1996
- Tongue
- English
- Weight
- 463 KB
- Volume
- 163
- Category
- Article
- ISSN
- 0038-0938
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✦ Synopsis
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 he 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.