• Vinod Krishan

      Articles written in Journal of Astrophysics and Astronomy

    • Optical interferometric observations of a transient event of 1986 March 13 in the coma of Comet Halley

      C. Debi Prasad T. Chandrasekhar J. N. Desai N. M. Ashok Vinod Krishan

      More Details Abstract Fulltext PDF

      During the recent apparition of Comet Halley in 1985-86 a transient ionic event in the form of a blob of H2 O+ emission was recorded in thecoma at ∼ 0h UT on 1986 March 13. Observations were carried out using a special IHW filter for H2 O+ emission at 7000 å/175 å, a 35 cm telescope, a Fabry-Perot interferometer and an image intensifier camera from Gurushikhar, Mt Abu. (24‡39’N,72‡ 47’E). A Fabry-Perot inter-ferogram in Ha taken a few minutes later at the same location reveals strong hydrogen emission (Hα) associated with the blob. The velocity field in the blob is structured with relative velocities upto ∼ 35km s−1. The event is interpreted as arising due to the sector boundary crossing of the interplanetary magnetic field by the comet

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