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We report on 10 years of monitoring of the 8.7-s Anomalous X-ray Pulsar 4U0142+61 using the Rossi X-Ray Timing Explorer (RXTE). This pulsar exhibitedstable rotation from 2000 March until 2006 February: the RMS phase residual fora spin-down model which includes nu, nudot, and nuddot is 2.3%. We report apossible phase-coherent timing solution valid over a 10-yr span extending backto March 1996. A glitch may have occured between 1998 and 2000, but is notrequired by the existing timing data. The pulse profile has been evolving since2000. In particular, the dip of emission between its two peaks got shallowerbetween 2002 and 2006, as if the profile were evolving back to its pre-2000morphology, following an earlier event, which possibly also included the glitchsuggested by the timing data. These profile variations are seen in the 2-4 keVband but not in 6-8 keV. We also detect a slow increase in the pulsed fluxbetween 2002 May and 2004 December, such that it has risen by 36+/-3% over 2.6years in the 2-10 keV band. The pulsed flux variability and the narrow-bandpulse profile changes present interesting challenges to aspects of the magnetarmodel.

Years of RXTE Monitoring of Anomalous X-ray Pulsar 4U 0142+61: Long-Term Variability