Tracking dispersion measure variations of timing array pulsars with the GMRT

Ujjwal Kumar, Yashwant Gupta, Willem Van Straten, Stefan Osłowski, Jayanta Roy, N. D R Bhat, Matthew Bailes, Michael J. Keith

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


    We present the results from nearly three years of monitoring of the variations in dispersion measure (DM) along the line-of-sight to 11 millisecond pulsars using the Giant Metrewave Radio Telescope (GMRT). These results demonstrate accuracies of single epoch DM estimates of the order of 5 × 10-4 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 of DM variations due to the solar wind and solar corona and compare with the existing models. © 2013 International Astronomical Union.
    Original languageEnglish
    Title of host publicationProceedings of the International Astronomical Union|Proc. Int. Astron. Union
    Number of pages2
    Publication statusPublished - Aug 2012

    Publication series

    NameIAU Symposium


    • (stars:) pulsars: general
    • ISM: general
    • Sun: corona


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