The inhomogeneous response across the solar disc of unresolved Doppler velocity observations

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Unresolved Doppler velocity measurements are not homogenous across the solar disc (Brookes et al. 1978). We consider one cause of the inhomogeneity that originates from the BiSON instrumentation itself: the intensity of light observed from a region on the solar disc is dependent on the distance between that region on the image of the solar disc formed in the instrument and the detector. The non-uniform weighting affects the realization of the solar noise and the amplitudes of the solar oscillations observed by a detector. An 'offset velocity', which varies with time, is observed in BiSON data and has consequences for the long-term stability of observations. We have attempted to model, in terms of the inhomogeneous weighting, the average observed offset velocity.
4 pages, 4 figures, proceedings of GONG 2008/SOHO XXI meeting

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Astrophysics

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http://salesiana.dossiersoluciones.com/handle/123456789/172094

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0810.3856
 http://arxiv.org/abs/0810.3856

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arXiv