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We present the results from nearly three years of monitoring of thevariations in dispersion measure (DM) along the line-of-sight to 11 millisecondpulsars using the Giant Metrewave Radio Telescope (GMRT). These resultsdemonstrate accuracies of single epoch DM estimates of the order of 5x10^(-4)cm^(-3) pc. A preliminary comparison with the Parkes Pulsar Timing Array (PPTA)data shows that the measured DM fluctuations are comparable. We show effects ofDM variations due to the solar wind and solar corona and compare with theexisting models.

Tracking dispersion measure variations of timing array pulsars with the GMRT