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

Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/3720

Title:	Optical interferometric observations of a transient event of 1986 March 13 in the coma of Comet Halley
Authors:	Prasad, D. C Chandrasekhar, T Desai, J. N Ashok, N. M Krishan, V
Keywords:	Cometary atmospheres Fabry-perot interferometers Halley's comet Visible spectrum Emission spectra H alpha line Interplanetary magnetic fields Solar wind Spectrum analysis Water
Issue Date:	Mar-1989
Publisher:	Indian Academy of Sciences
Citation:	Journal of Astrophysics and Astronomy, Vol. 10, No. 1, pp. 1 - 20
Abstract:	During the recent apparition of Comet Halley in 1985-86, a transient ionic event in the form of a blob of H2O(+) emission was recorded in the coma at about 0 h UT on March 13, 1986. Observations were carried out using a special filter for H2O(+) emission at 7000 A/175 A, a 35-cm telescope, a Fabry-Perot interferometer, and an image intensifier camera from Gurushikhar, Mt. Abu. A Fabry-Perot interferogram in H-alpha taken a few minutes later at the same location, reveals strong hydrogen emission (H-alpha) associated with the blob. The velocity field in the blob is structured with relative velocities up to about 35 km/sec. The event is interpreted as arising due to the sector boundary crossing of the interplanetary magnetic field by the comet.
URI:	http://hdl.handle.net/2248/3720
ISSN:	0250-6335
Appears in Collections:	IIAP Publications

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