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The single-pulse characteristics of the millisecond pulsar PSR B1937)21 are studied using the recently installed Caltech baseband recorder at the Arecibo Radio Observatory in Puerto Rico. This is the —rst such analysis of this object that includes both average intensity pulses as well as ìì giant pulses.ˇˇ Pulse ensemble-averaging techniques are developed in order to study the characteristics of PSR B1937)21ˇs single pulses since the high time resolution signal-to-noise ratio is less than unity. This analysis reveals that the nongiant pulse radio emission is extremely stable. All observed —uctuations are consistent with diÜractive interstellar scattering. Such intrinsic stability has yet to be observed in other radio pulsars. Subject headings: pulsars: generalpulsars: individual (B1937)21, B0823)26) ¨ radio continuum: starsstars: neutron

Single‐Pulse Characteristics of the Millisecond Radio Pulsar PSR B1937+21 at 430 MHz