  We report the results of simultaneous observations of the Vela pulsar in
X-rays and radio from the RXTE satellite and the Mount Pleasant Radio
Observatory in Tasmania. We sought correlations between the Vela's X-ray and
radio flux densities and radio arrival times on a pulse by pulse basis. We
found significantly higher flux density in Vela's main X-ray peak during radio
pulses that arrived early. This excess flux shifts to the 'trough' following
the 2nd X-ray peak during radio pulses that arrive later. We suggest that the
mechanism producing the radio pulses is intimately connected to the mechanism
producing X-rays. Current models using resonant absorption in the outer
magnetosphere as a cause of the radio emission, and less directly of the X-ray
emission, are explored as a possible explanation for the correlation.
