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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/010/01/0001-0020

    • 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

       
      Published
      March 1989
      Manuscript received
      18 January 1988
      Manuscript revised
      27 July 1988
      Accepted
      25 November 1988

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

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      Posted on July 25, 2019

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