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Diffraction scintillation at 1.4 and 4.85GHz

Diffraction scintillation at 1.4 and 4.85GHz. V.M.Malofeev, O.I.Malov, S.A.Tyul’bashev PRAO, Russia W.Sieber Hochschule Nederrhein, Germany A.Jessner, R.Wielebinski MPIfR, Germany. Introduction.

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Diffraction scintillation at 1.4 and 4.85GHz

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  1. Diffraction scintillation at 1.4 and 4.85GHz V.M.Malofeev, O.I.Malov, S.A.Tyul’bashev PRAO, Russia W.Sieber Hochschule Nederrhein, Germany A.Jessner, R.Wielebinski MPIfR, Germany

  2. Introduction • Most important characteristic of the turbulent interstellar medium is the three-dimensional spatial spectrum of the electron density fluctuations: a Gaussian or power law. • The aim of our project was to obtain the form of turbulence spectrum for different regions of the sky and for pulsars which are at different distances.

  3. Observations • 100m RT in Effelsberg during 2-12th Sept. 2003 • 15 pulsars at 1.4GHz and 6 at 4.85GHz • Criteria: strong objects with good SNR, pulsars should clearly show scintillation • to obtain dynamic spectra the total receiver bandwidht must be much broader then the decorrelation bandwidth of pulsars • 1.4GHz: 30chan x 1.33MHz= 40MHz • 4.85GHz: 8chan x 60MHz=480MHz • two polarization; flux measurements every 30sec; duration of observations 1-10hours

  4. PSR 0329+54 (1.41GHz) • Example of dynamic spectra in the strong scintillation regime

  5. PSR 1929+10 (1.4GHz; 7 Sept.) • Example of dynamic spectra in the weak(?) scin.regime

  6. PSR 1929+10 (1.4GHz) • Scin. data; • ACF time function; • CCF frequency function; • power spectrum; • structure function

  7. PSR 2020+28 (1.4GHz) • 03 Sept. - strong scint; 10 Sept. - lensing effect

  8. PSR 2020+28 (1.4GHz) • Scint. data; • ACF time function; • CCF frequency function; • power spectrum • structure function

  9. PSR 1642-03 (4.85GHz) • Dynamic spectra in the weak scin. regime

  10. PSR 0355+54 (4.85GHz) • Dynamic spectra in the strong(?) scin.regime

  11. PSR 0355+54 • Scint. data; • ACF time function • CCF frequency function • Power spectrum • Structure function

  12. Number of pulsars

  13. Conclusion • We have obtained scintillation data for 11 PSR at 1.4GHz and 5 PSR at 4.85GHz: the decorrelation time and bandwidth, power low index for spectra and structure function • Possible lensing effect (focal spot effect) have been detected for a few pulsars near the critical frequency

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