A possible disconnection event in the inner coma of comet Bradfield 1979X

Details A possible disconnection event in the inner coma of comet Bradfield 1979X A possible disconnection event in the inner coma of comet Bradfield 1979X

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994p%26ss...42..635s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 42, no. 8, p. 635-642

Mathematics

Logic

Comets, Interplanetary Magnetic Fields, Magnetic Properties, Phase Shift, Solar Wind, Stellar Rotation, Digital Techniques, Emission Spectra, High Resolution, Image Processing

Scientific paper

High-resolution photographs of the long-period comet Bradfield 1979X taken in blue as well as in red light were digitized and morphologically analyzed. The photographs were taken with the European Southern Observatory (ESO) 3.6-m Telescope at La Silla, Chile, on 23 and 24 January 1980, when the comet had a geocentric distance of delta = 0.2 AU. They are therefore among the most highly resolved observations ever obtained of a cometary coma. A change in the appearance of the plasma tail near the nucleus between 23 and 24 January 1980 can clearly be observed. We interpret this distortion as the result of a possible disconnection event (DE). The starting time of the DE has been determined to 23 January 1980, between 4:00 UT and 5:00 UT. The solar wind and interplanetary magnetic field properties for January 1980 were investigated to search for a possible association of the DE to variations in the solar wind velocity and in the interplanetary magnetic field (IMF). In addition to the DE, the structural enhanced images show indications for an enhanced abundance of gas and dust particles in sunward direction, which could be the result of an asymmetric outgassing from the nucleus.

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