Evidence for two types of sources creating Halley's coma

Details Evidence for two types of sources creating Halley's coma Evidence for two types of sources creating Halley's coma

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992eocm.rept..211r&link_type=abstract

In ESA, Environment Observation and Climate Modelling Through International Space Projects. Space Sciences with Particular Empha

Astronomy and Astrophysics

Astronomy

1

Cosmic Dust, Cosmic Gases, Halley'S Comet, Imaging Spectrometers, Plasma Jets, Spaceborne Astronomy, Comet Heads, Comet Nuclei, Comet Tails, Cometary Atmospheres, Emission Spectra, Image Processing, Molecular Spectra, Spatial Distribution, Vega Project

Scientific paper

Monochromatic composite images of Halley's coma in a 50 deg angular sector of radial extent 40,000 km are constructed in taking advantage of the spatial scanning capability of the Vega 2 three channel spectrometer. These images show the existence of two well contrasted jets which are identified in the solar dust scattered continuum as well as in the molecular emissions. The spatial distribution of dust scattered intensity in the UV at 377 nm and the visible at 482 nm are compared in computing an image of the I377/I482 intensity ratio. The image shows that the ratio is slightly bluer in a region located between 10,000 and 25,000 km which appears as a result of jet spreading. The existence of a region connected with the jets where the color of dust is bluer is interpreted as the result of fragmentation of dust grains transported inside jets from the nucleus to distances of 10,000 to 25,000 km. The fragmentation processes would produce a local source of tiny submicronic particles of radius a less than 0.4 micrometers and would also be followed by a release of gas. The results presented provide a strong argument for the existence of an extended source connected with the jets. It is coherent with the detection of a CO source at 10,000 km by the Giotto NMS spectrometer 5 days later.

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