INTERSTELLAR SCINTILLATION OF PULSARS AT 102.7 MHZ

Measurements of the frequency correlation radius of diffractive scinti llations for nine strong pulsars were conducted at a frequency of 102. 7 MHz on the BSA antenna of the Lebedev Institute of Physics of the Ru ssian Academy of Sciences, using a narrow band 128-channel spectrum an alyzer with channel bandwidth 1.25 kHz. Changes in these radii over a time interval of 1.5 months were revealed for two pulsars. Drift behav ior in frequency structure was observed in the dynamic spectra of PSR 0834+06 and PSR 1919+21. For several sources, the existence of a very narrow band structure, as well as the rare appearance of a wider band structure, are indicated. Possible origins for this frequency structur e are discussed.