  Diffractive and refractive magnetospheric scintillations may allow a direct
testing of the plasma inside the light cylinder. Unusual electrodynamics of the
strongly magnetized electron-positron plasma allow separation of the
magnetospheric and interstellar scattering.
  The most distinctive feature of the magnetospheric scintillations is their
independence on frequency. Diffractive scattering due to small scale
inhomogeneities produce a scattering angle that may be as large as 0.1 radians,
and a typical decorrelation time of $10^{-8}$ seconds.
  Refractive scattering due to large scale inhomogeneities is also possible,
with a typical angle of $10^{-3}$ radians and a correlation time of the order
of $10^{-4}$ seconds. Some of the magnetospheric propagation effects may have
already been observed.
