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

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

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989japa...10....1d&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 10, March 1989, p. 1-20. Research supported by the Department of Sp

Astronomy and Astrophysics

Astronomy

1

Cometary Atmospheres, Fabry-Perot Interferometers, Halley'S Comet, Visible Spectrum, Emission Spectra, H Alpha Line, Interplanetary Magnetic Fields, Solar Wind, Spectrum Analysis, Water, Comets, Comae, Interferometry, Halley, Astronomy, Water, Ions, Velocity, Emissions, Earth-Based Observations, Hydrogen, Magnetic Fields, Equipment, Diagrams, Parameters, Photographs, Structure, Kinematics, Distribution, Brightness, Theoretical Studies

Scientific paper

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.

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