title: Correlation of subpulse structure in a sequence of pulses from pulsar PSR 1919+21.
abstract: The fluctuation power spectrum of a sequence of momentary pulse energies formed using an integration gate narrower than the pulse width displays features not visible with a wider gate. The analysis indicates that the class two period is a function of phase within the pulse profile. The statistical constitution of the mean pulse is discussed.
authors.affiliation: Cornell-Sydney University, Astronomy Center, Arecibo Observatory, Puerto Rico.
authors.forename: D C
authors.initials: DC
authors.lastname: Backer