Abstract
A description is given of a device which automatically sweeps the meridian once each five minutes and records the intensity of the auroral green line (5577 A) in each 10° step. It is almost completely insensitive to white light, but produces a warning signal if the white light becomes very bright. The response is roughly logarithmic over a range of 10 000 to 1 in intensity. The intensities are recorded directly and also in digital form. For the latter, five steps of intensity are distinguished and punched in paper tape; each step corresponds to a factor of 10 and the scale agrees fairly closely with the accepted International Brightness Coefficients.
© 1956 Optical Society of America
Full Article | PDF ArticleMore Like This
R. B. Dunn and E. R. Manring
J. Opt. Soc. Am. 46(8) 572-577 (1956)
George Barnes
J. Opt. Soc. Am. 43(12) 1176-1180 (1953)
H. Richard Blackwell, Benjamin S. Pritchard, and James G. Ohmart
J. Opt. Soc. Am. 44(4) 322-326 (1954)