Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..256j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 256-260.
Astronomy and Astrophysics
Astrophysics
12
Astronomical Spectroscopy, Focusing, Halley'S Comet, Molecular Ions, Carbon Dioxide, Comet Nuclei, Plasma Dynamics, Radio Telescopes, Solar Wind
Scientific paper
Comet Halley was observed with the ESO 1 m telescope and a dedicated focal reducer instrumentation. Narrow-band images of the comet in the light of the CO2+ ion at 367.4 nm were obtained for the first time. On these images, the cometary plasma can be observed as close as 104km to the nucleus. No plasma envelopes are visible. Multislit spectra show emissions of OH+, CO2+, CO+, N2+ and CH+. They indicate the presence of CO+ ions in a large halo around the comet, not only in the tail streamers.
Geyer Edward H.
Haenel A.
Jockers Klaus
Rosenbauer Helmut
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