Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250c.277k&link_type=abstract
In ESA, Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 3: Posters p 277-280 (SEE N87-26714
Astronomy and Astrophysics
Astronomy
Astronomical Photography, Comet Tails, Halley'S Comet, Space Observations (From Earth), Interplanetary Magnetic Fields, Radial Velocity, Solar Wind
Scientific paper
Results of photographic observations of comet Halley are presented. The length of the plasma tail increased between 1986 Jan. 5 and 10 from 0.9 to 2.3 deg. Within this time span the radial component of the solar wind velocity, as determined from the aberration angle of the plasma tail, has a minimum value between 160 and 280 km/sec. The minimum value of its tangential component was between 1 and 7 km/sec, or between 4 and 12 km/sec, assuming a radial velocity component of 300 and 400 km/sec, respectively. These values apply to the region of interplanetary space with the ecliptical latitude +7.6 deg at a distance of 0.983 AU from the Sun. Shortly before January 8.7, the comet very probably passed through a magnetic sector boundary of the interplanetary magnetic field.
Kubáček D.
Pittich Eduard M.
Zvolankova Judita
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