Gaseous jets in Comet P/Halley

The authors describe additional properties of the jets previously reported to exist in images taken in the light of CN. The jets also exist in the light of other radicals, specifically C₂. The jets do not exist in the continuum images although it appears that one of the jets seen may come from the same area on the nucleus that produces much of the dust. The jets are seen to persist, although with varying geometry, for two months or more, from the time of the spacecraft encounters in March to the beginning of May. The strength of the jets is well correlated with fluctuations in the overall production rate of radicals by the comet.