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.

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Presentation transcript:

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 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.

Observations 100m RT in Effelsberg during 2-12th Sept 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

PSR (1.41GHz) Example of dynamic spectra in the strong scintillation regime

PSR (1.4GHz; 7 Sept.) Example of dynamic spectra in the weak(?) scin.regime

PSR (1.4GHz) Scin. data; ACF time function; CCF frequency function; power spectrum; structure function

PSR (1.4GHz) 03 Sept. - strong scint; 10 Sept. - lensing effect

PSR (1.4GHz) Scint. data; ACF time function; CCF frequency function; power spectrum structure function

PSR (4.85GHz) Dynamic spectra in the weak scin. regime

PSR (4.85GHz) Dynamic spectra in the strong(?) scin.regime

PSR Scint. data; ACF time function CCF frequency function Power spectrum Structure function

Number of pulsars

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