A SIMPLE APPROXIMATION TO EXTINCTION EFFICIENCY VALID OVER ALL SIZE PARAMETERS

Authors
  1. Evans, B.T.N.
  2. Fournier, G.R.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
A semi-empirical approximation to the extinction efficiency, based on a modification to the anomalous diffraction formula, is given and compared to the exact Mie computation. This approximation has been verified for complex refractive indices m = n - ik, where 1.01 less than or equal to n less than or equal to 2.00 and 0 less than or equal to k less than or equal to 10. The approximation is uniformly valid over all size parameters and has the correct Rayleigh and large particle asymptotic behaviour. The accuracy of this formula is discussed as well as its computational advantages. The formula is also applied to some of the LOWTRAN aerosol models.
Report Number
DREV-4578/90 —
Date of publication
15 Jan 1990
Number of Pages
21
DSTKIM No
90-01049
CANDIS No
63321
Format(s):
Hardcopy;Originator's fiche received by DSIS

Permanent link

Document 1 of 1

Date modified: