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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 46, Iss. 8 — Aug. 1, 1956
  • pp: 578–583

Automatic Auroral Recorder

D. M. HUNTEN  »View Author Affiliations


JOSA, Vol. 46, Issue 8, pp. 578-583 (1956)
http://dx.doi.org/10.1364/JOSA.46.000578


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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.

Citation
D. M. HUNTEN, "Automatic Auroral Recorder," J. Opt. Soc. Am. 46, 578-583 (1956)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-46-8-578

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