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    • Keywords


      Comet Halley; Hα Fabry; Perot interferometry; imaging; transient event

    • Abstract


      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

    • Author Affiliations


      C. Debi Prasad1 T. Chandrasekhar1 J. N. Desai1 N. M. Ashok1 Vinod Krishan2

      1. Physical Research Laboratory, Navrangpura, Ahmedabad - 380009
      2. Indian Institute of Astrophysics, Bangalore - 560034
    • Dates

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