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

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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

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Authors and Affiliations

  1. Physical Research Laboratory, 380009, Navrangpura, Ahmedabad

    C. Debi Prasad, T. Chandrasekhar, J. N. Desai & N. M. Ashok

  2. Indian Institute of Astrophysics, 560034, Bangalore

    Vinod Krishan

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  1. C. Debi Prasad
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  2. T. Chandrasekhar
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  3. J. N. Desai
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  4. N. M. Ashok
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  5. Vinod Krishan
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Prasad, C.D., Chandrasekhar, T., Desai, J.N. et al. Optical interferometric observations of a transient event of 1986 March 13 in the coma of Comet Halley. J. Astrophys. Astr. 10, 1–20 (1989). https://doi.org/10.1007/BF02714975

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  • DOI: https://doi.org/10.1007/BF02714975

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