We have used the 40 cm coronagraph with an inverse occulting disk to observe the limb darkening free of instrumental stray light. Our results agree remarkably well with those of Petro et al. (1984, Astrophys. J.283, 426) who used the McMath – Pierce tower telescope but employed a different correction procedure for instrumental stray light than Neckel and Labs (1994, Solar Phys.153, 91), whose results for λ=445.1 nm deviate systematically, apparently overcorrecting for stray light. Future continuation of such highly reproducible measurements offers an interesting independent diagnostic of possible slow trends in effective temperature (Teff) and in total solar irradiance.
Solar Phys Disk Center Total Solar Irradiance Stray Light Zenith Distance
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