Abstract
Accurate flux densities of 25 pulsars at 310, 416, and 750 MHz have been measured for 43 consecutive days with the NRAO 91 m telescope. Pulsars covering a wide range of dispersion measures (DM) were chosen to distinguish intrinsic luminosity variations from diffractive and refractive interstellar scintillations (RISS). The pulsars PSR 1818 - 04, 1933 + 16, and 211 + 46 have such high DMs and/or low space velocities that their predicted RISS time scales at low frequencies are much greater than 43 days. These pulsars were observed to have quite constant flux densities, implying that their luminosities must be intrinsically stable on time scales from several minutes to several weeks. Since the DM is primarily a property of the interstellar medium along the line of sight to a pulsar, rather than of the pulsar itself or its environment, it is concluded that most pulsars have intrinsically stable luminosities. 30 refs.
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