Diapositive 1

1
Classification of SuperDARN radar Doppler
spectra Application to the determination of
scintillation regions.
C. Hanuise and T. Dudok de Wit, LPCE/CNRS,
Orléans, France

• What is the relation between SuperDARN data and
  scintillations ?
• SuperDARN observations are based on the
  detection of 10m-wavelength irregularities, i.e.
  much smaller than those responsible for the
  scintillations
• They are nevertheless due to similar mechanisms
  and might be related trough cascading from larger
  to smaller wavelengths
• The Doppler spectral width is related to the
  level of ionospheric turbulence, as is the level
  of scintillations. Are regions of high spectral
  width collocated with regions of scintillations
  (e.g.cusp) ?
• Determination of scintillations from radar data
• Radar data might be helpful for determining
• the location of irregularities (subject to
  limitations of HF propagation)
• the intensity trough the relation between the
  scintillation index and the spectral width of
  Doppler spectra.
• For example, are regions of high-spectral width
  related to regions of high scintillation index ?
• Radar data can be classified according to the
  values of some spectral parameters.
• Is there some relation between the radar
  backscatter classes and scintillation regions ?
• Aim of project
• The radar classification allows to determine the
  ionospheric footprints of magnetospheric regions,
• on a statistical basis. It is in the process of
  being extended to individual cases and to
  real-time determination.