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A computation of Zeeman polarization of solar spectra from lambda 3700 A to 8800 A
51 plates, each of 10 bands covering 10 A |
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| or GIF plates below (2280 x 3324 pixels) |
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We used the solar atlas of Delbouille et al (1973), from lambda 3000 A to lambda 10000 A (step 2 mA)
at disk centre (mu = 1.0), taken at the Jungfraujoch station (Switzerland, a very high and dry site).
We restricted the wavelength range to lambda 3700 - 8800 A for which we have the line identification
provided by the Moore table (Moore et al, 1966) and the equivalent Lande factors g*.
We quantified the sensitivity to the Zeeman effect using the weak field theory (Landi, 1992, Stenflo, 1994).
In that case, the Zeeman splitting
must be small in comparison to the Doppler width of the considered line.
The circular polarization rate is V/I ; it is maximum (in absolute value) at the inflexion points of the line profiles. The linear polarization rate is SQRT(Q**2+U**2)/I ; it is maximum in the line centre. The spectra are displayed by pages of 100 A, each displaying bands of 10 A. Delbouille’s spectrum is shown in black. Intensities are normalized to the adjacent continuum Ic. The blue numbers are equivalent Lande factors g*. The line identification follows the convention of the Moore et al (1966) table (slash for main contributors in case of a blend, dash for blends, parenthesis for masked lines, p for predicted line, see page XVIII of their book for details). The circular polarization spectrum V/I is drawn in red; it was calculated for B = 1000 G and for g*=1.0; the red vertical bars provide the minima and the maxima of V/I (located at line inflexion points) for B = 1000 G and take into account the equivalent Lande factor g* of each line (V/I is proportional to the product g*B). The linear polarization spectrum SQRT(Q**2+U**2)/I is drawn in green; it was computed for B = 1000 G and for g*=1.0; the green vertical bars provide the maxima of SQRT(Q**2+U**2)/I (located at line centre) and use the equivalent Lande factor g* of each line; the polarization rate is proportional to the product (g*B)**2 and is, in general, much smaller than V/I. For a given magnetic field B, the maximum polarization rates of V/I and SQRT(Q**2+U**2)/I can be easily deduced from the plots: just multiply by the factors (B/1000) or (B/1000)², respectively. 4000-4100 4100-4200 4200-4300 4300-4400 4400-4500 4500-4600 4600-4700 4700-4800 4800-4900 4900-5000 5000-5100 5100-5200 5200-5300 5300-5400 5400-5500 5500-5600 5600-5700 5700-5800 5800-5900 5900-6000 6000-6100 6100-6200 6200-6300 6300-6400 6400-6500 6500-6600 6600-6700 6700-6800 6800-6900 6900-7000 7000-7100 7100-7200 7200-7300 7300-7400 7400-7500 7500-7600 7600-7700 7700-7800 7800-7900 7900-8000 8000-8100 8100-8200 8200-8300 8300-8400 8400-8500 8500-8600 8600-8700 8700-8800 |