Light scattering by spheroidal particles
treated with the separation of variables method

Program hom_c (version 4.3q2a)

• Directory content:
  
  • readme (2.6 K) --- a readme file nearly equivalent to this page
    
  • homn.dat (0.7 K) --- input data file
    
  • h4_3q2a.for (143.4 K) --- Fortran code
    
  • h-test.dat (5.8 K) --- test output file
    
  • hom-test.res (7.2 K) --- test output file
    
  
  
• Parameters:
  

  nterms:	number of terms in Eqs. for efficiency factors
  nalphas:	number of angles for incident radiation.

  (values of the parameters can be changed in the beginning of the file h4_3q2a.for)
  
  Values of other parameters are specified in the input file homn.dat. A discription of the parameters is given at the very beginning of the code's text.
  
  
• Restrictions:
  

  c2 = ri*(2*pi/wvl)*(d/2)	<= 135 (?) for prolate spheroids
  	<= 100 (?) for oblate spheroids

  (d - the focus distance of a spheroid)
  
  nterms =~ 1.2 * cdabs(c2) + 8 ( + ~30 if ksi0 > 2).
  
  nalphas <= 91
  
  
• Recommended values:
  

  refractive index:	k <= 1/2*n (?)
  eps:	1e-15 for prolate spheroids
  	1e-15 for oblate spheroids
  eps1:	1e-3 ÷ 1e-6

  
  
• Publications:
  
  • Voshchinnikov N.V., Farafonov V.G.
    Optical properties of spheroidal particles,
    Astrophys. Space Sci. 1993. V. 204. P. 19-86.
    
  • Voshchinnikov N.V.
    Electromagnetic scattering by homogeneous and coated spheroids:
    calculations using the separation of variables method,
    J. Quant. Spectrosc. Radiat. Transfer 1996. V. 55. P. 627-636.
    
  • Farafonov V.G., Voshchinnikov N.V., Somsikov V.V.
    Light scattering by a core-mantle spheroidal particle,
    Applied Optics 1996. V. 35. P. 5412-5426.
    
  
  
• Questions, more information, new versions:
        Dr. Nikolai Voshchinnikov
        Astronomical Institute
        St. Petersburg University
        St. Petersburg-Peterhof
        198904 Russia
        e-mail: nvv@aispbu.spb.su