Abstract
In a recent paper (Neckel and Labs, 1987a) a strong claim is made for detection of surprisingly large variations in photospheric limb darkening over time-scales of minutes to hours. Some of this evidence relies on re-interpretation of our measurements carried out at Kitt Peak between 1980–1982 (Petro et al., 1984). The purpose of this Comment is to draw attention to information we have published which suggests that the variations noted by Neckel and Labs are more likely to be of instrumental than solar origin.
Similar content being viewed by others
References
Elste, G.: 1988, in P. Foukal (ed.), Solar Radiative Output Variation, available from CRI, Inc., Cambridge, U.S.A., p. 204.
Kuhn, J.: 1988, in P. Foukal (ed.), Solar Radiative Output Variation, available from CRI, Inc., Cambridge, U.S.A., p. 217.
Neckel, H. and Labs, D.: 1987a, Solar Phys. 110, 139.
Neckel, H. and Labs, D.: 1987b, Solar Phys. 110, 201.
Petro, L., Foukal, P., and Kurucz, R.: 1985, Solar Phys. 98, 23.
Petro, L., Foukal, P., Rosen, W., Kurucz, R., and Pierce, K.: 1984, Astrophys. J. 283, 426.
Rosen, W. and Chromey, F.: 1985, Astron. J. 90, 139.
Rosen, W., Foukal, P., Kurucz, R., and Pierce, A.: 1982, Astrophys. J. 253, L89.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Foukal, P. Comment on ‘asymmetry and variations of solar limb darkening along the diameter defined by diurnal motion in April 1981’ by Neckel and Labs (1987). Sol Phys 120, 249–251 (1989). https://doi.org/10.1007/BF00159878
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00159878