Abstract

The extinction produced by wind-blown Saharan dust particles in the atmosphere above the Canary Islands has been modelled by means of Mie theory calculations, on the basis of available evidence relating to its composition and size distribution. Results indicate that the extinction is neutral to an accuracy of better than 5% in the optical region of the spectrum from 0.32 to 1.0 microns. The presence of dust is thus expected to influence only the absolute calibration of photometry in this wavelength range: it should have negligible effect on photometric colours and relative spectrophotometry. In the infrared, however, our model predicts a significant decline in extinction with increasing wavelength beyond 1.5 microns, an affect which could compromise attempts to carry out photometry in the K, L and M photometric passbands during dusty periods.

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