Welcome to the Harris Geospatial product documentation center. Here you will find reference guides, help documents, and product libraries.


Harris Geospatial / Docs Center / Libraries / Beaumont / BLACKBODY

BLACKBODY

BLACKBODY

Purpose


  This function calculates the Planck function I_nu or
  I_lambda.
    I_nu = 2h nu^3 c^-2 ( exp(h nu / kT) -1)^-1
    I_lambda = 2h c^2 lambda^-5 (exp ( hc / lambda kt) -1)^-1

Category


  Astrophysics

Calling Sequence


  result = BLACKBODY(temp, x, [/freq, /wave, /cgs, /mks])
 

Inputs


  temp: The temperature, in K. Scalar or vector. If it is a scalar,
        the same temperature is assumed for each value of x.
    x: By default, the wagelength in mks units. If /cgs is set, then
    this number is in cgs units. If /freq is set, this number is the
    frequency.

Keyword Parameters


  wave: Set to receive the input as a wavelength, and output I_lambda
  freq: Set to receive the input as a frequency, and output I_nu
        (default)
  cgs: Set to receive the input and return the output in cgs units
  mks: Set to receive the input and return the output in mks units
        (default)

Outputs


  I_nu or, if /wave is set, I_lambda

Modification History


  May 2009: Written by Chris Beaumont



© 2017 Exelis Visual Information Solutions, Inc. |  Legal
My Account    |    Buy    |    Contact Us