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Thin screen scintillation model

 

  Inhomogeneities of refractive index in a thin screen, mid way between source and observer
  Essentially a Young's double slit experiment, but with multiple slits
  An interference pattern forms
  Earth and pulsar motion cause different parts of the interference pattern to be sampled
  Results in random flux variations
  Interference pattern is frequency dependent

  
Figure 11: The thin screen model. From Lyne & Graham-Smith 1990 [23]

  Wavelength scale of amplitude variations is

  In practice the screen has thickness D and the frequency bandwidth of amplitude variations is

  
Figure 12: Amplitude variations of PSR B0329+54 as a function of time as observed using MERLIN