Observations of the limb effect in potassium ?7699

Lopresto, James C.; Kraus, Pauline M.; Pierce, A. Keith

doi:10.1007/bf00690612

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“…The limb shift effect of this solar line, and the GRS itself, have also been measured by LoPresto, Kraus & Pierce (1994) at the Mac Math-Pierce solar telescope also using a small aperture on a large solar image. They also measured 99 ± 7 % of the full predicted GRS value and a small linear limb shift.…”

Section: Discussion Of the Resultsmentioning

confidence: 73%

“…Therefore, if the line is not symmetric the mea- surement can be either blue-or redshifted with respect to the minimum. Measurements of the asymmetry of the KI7699Å line made by LoPresto, Kraus & Pierce (1994) and Bonet et al (1988) show that, at between 30 and 60% of the residual intensity, it is blueshifted at the centre of the Sun, while close to the limb it is centred or even redshifted with respect to the minimum. Using integral sunlight, Roca Cortés, Vázquez & Wöhl (1983) find that the wings are blueshifted by ≈ 50 ± 30 m s −1 with respect to the minimum.…”

Section: Discussion Of the Resultsmentioning

confidence: 98%

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The Mark-I helioseismic experiment – I. Measurements of the solar gravitational redshift (1976–2013)

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Pallé

2014

Monthly Notices of the Royal Astronomical Society

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The resonant scattering solar spectrophotometer 'Mark-I', designed and build at the University of Birmingham (UK) and located at the Observatorio del Teide (Spain), has been continuously in operation for the past 38 years. During this period of time, it has provided high precision measurements of the radial velocity of the Sun as a star, which has enabled the study of the small velocity fluctuations produced by the solar oscillations and the characterization of their spectrum. So far, it has been one of the pioneer experiments in the field of helioseismology and contributed to the development of that area. Moreover, because of its high sensitivity and long term instrumental stability, it also provides an accurate determination (to within a few parts in 103 ) of the absolute daily velocity offset, which contains the so-called 'solar gravitational red-shift'. In the present paper, results of the analysis of the measurements of this parameter over the whole period 1976-2013 are presented. The result of this series of measurements is 600.4 ± 0.8 m s −1 with an amplitude variation of ±5 m s −1 , which is in anticorrelation with the phase of the solar activity cycle. The 5% difference found respect to the value predicted by the equivalence principle is probably due to the asymmetry of the solar spectral line used.

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Section: Discussion Of the Resultsmentioning

confidence: 73%

Section: Discussion Of the Resultsmentioning

confidence: 98%