RECOVERY OF SPECTRAL OPTICAL DEPTH AND ZERO-AIRMASS SOLAR SPECTRAL IRRADIANCE UNDER CONDITIONS OF TEMPORALLY VARYING OPTICAL DEPTH.

J. A. Reagan, I. C. Scott-Fleming, B. M. Herman, R. M. Schotland

Research output: Contribution to journalConference article

2 Scopus citations

Abstract

The effect of temporal variations in atmospheric optical depth on the determination of the zero-airmass voltage via Langley plot fitting of solar radiometer data is analyzed. It is shown that short-term variations in optical depth can be detected fairly accurately with only an approximate estimate of the zero-airmass voltage. Simulations are presented to assess the effect of specific time variations in optical depth on zero-airmass voltage determinations. It is shown that the fractional error in the zero-airmass voltage determination varies in an approximately one to one relation to the absolute change in optical depth. It is also shown that the error in the zero-airmass voltage determination can be much greater than the standard deviation of this voltage obtained form the least-squares straight-line fit of the Langley plot data.

Original languageEnglish (US)
Pages (from-to)455-459
Number of pages5
JournalEuropean Space Agency, (Special Publication) ESA SP
Volume1
StatePublished - Dec 1 1984

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science

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