Optical interferometric observations of a transient event of 1986 March 13 in the coma of Comet Halley |
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Authors: | C Debi Prasad T Chandrasekhar J N Desai N M Ashok Vinod Krishan |
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Institution: | (1) Physical Research Laboratory, 380009 Navrangpura, Ahmedabad;(2) Indian Institute of Astrophysics, 560034 Bangalore |
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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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Keywords: | Comet Halley Hα Fabry Perot interferometry imaging transient event |
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