Observers: Till Credner, K. Jockers
Location: Pik Terskol, Kaukasus, Russia
Date: March 15, 1997 02:20 UT
5 minute exposure, field of view: 7'x7', 512^2 CCD, filter: IF 360. Instrument: D=2m,f=5.6m. This is Comet Hale-Bopp observed with a narrow-band interference filter at 360nm. In this range are several line emissions of OH+ ions. But the scattered continuum radiation of the large dust particles is not subtracted. From pure continuum observations we know that the inner part of this image is dominated by the already known dust shells, but the outer regions show strong plasma activity. It is interesting to see, that the plasma seems to interact with these dust shells. This comet gives us for the first time the opportunity, to study the OH+ plasma, its motion and creation, close to the nucleus and in front of it.
MPAE (Max-Planck-Institut for Aeronomy, Germany)
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