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Astron. Astrophys. 364, 799-815 (2000)

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2. Scattering strengths

The magnetic field measurements carried out during the subsystem analysis of the GOLF instrument described by Gabriel et al. (1995) yielded both the magnetic field values and detailed profiles of the scattered light intensity as a function of wavelength. We describe in this section how the scattering profiles interact with the line profiles and provide a formalism for describing the combined output from the three scattering components.

Utilization of the full set of photomultipliers in place during the subsystem tests permited the determination of the scattering profile [FORMULA] in each of the Na D components. Of greatest importance to the deduction of the influence of the line profiles on the GOLF signal is the balance between the three scattering components. We define this balance by


where A is a normalization factor chosen so that [FORMULA], and [FORMULA] and [FORMULA] are chosen to isolate as well as possible the separate scattering components. For D1 using the red wing laser scans [FORMULA]nm and [FORMULA]nm while for D2 using blue wing data [FORMULA]nm, [FORMULA]nm and [FORMULA]nm. The dependence of [FORMULA] on cell gas temperature [FORMULA] is given in Table 2. These temperatures have been determined by comparison to the model calculations by Boumier et al. (1994). The platinum probe temperatures [FORMULA] are also given in Table 2. The temperatures used in evaluating the observed signal are based on [FORMULA].


Table 2. Scattering strengths

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© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001