Extraterrestrial solar flux measurement limitations due to a beer’s law assumption and uncertainty in local time

L. W. Thomason, B. M. Herman, R. M. Schotland, J. A. Reagan

Research output: Contribution to journalArticle

19 Scopus citations


The dependence on bandwidth of the error in estimating both optical depth and extraterrestrial solar flux due to an assumption of Beer’s law applicability across finite bandwidths is determined by a numerical integration of Beer’s law across the bandwidth. It was found that for 0.1% accuracy, 100-Å bandwidths suffice for central wavelengths of 0.45 Atm or greater; the maximum width yielding 0.1% accuracy decreases rapidly for shorter wavelengths. The accuracy to which solar elevation angle must be known to yield 0.1% accuracy is also examined and found to be a noteworthy though noncritical effect.

Original languageEnglish (US)
Pages (from-to)1191-1195
Number of pages5
JournalApplied optics
Issue number7
StatePublished - Apr 1 1982


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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