Comet Halley | Published:

Dust counter and mass analyser (DUCMA) measurements of comet Halley's coma from Vega spacecraft

Nature volume 321, pages 278280 (15 May 1986) | Download Citation



The Vega encounters with comet Halley allowed the first direct measurements of the spatial and temporal distributions of the masses and fluxes of dust particles originating from the comet nucleus. These data are fundamental for establishing the physical processes of dust emission from the nucleus, their propagation to form a coma, and the behaviour of dust jets. The measurements reported here were made with instruments employing a new principle of dust detection1,2, which have a high time-resolution (4µs) over a large range of dust fluxes and masses. The dust coma, whether quiescent (as seen by Vega 2) or containing a major jet structure (as seen by Vega 1), displays large, short-term variations throughout, which are at times quasi-periodic. The integral mass spectra increase in intensity to the lowest masses measured (contrary to some theoretical models), and the flux levels lie approximately in the ranges estimated previously from ground-based observations6. The coma is highly dynamical on all spatial and temporal scales, suggesting a complex structure of localized regions of dust emission from the nucleus.

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  1. Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA

    • J. A. Simpson
    • , A. J. Tuzzolino
    • , M. A. Perkins
    • , D. Rabinowitz
    •  & G. A. Lentz
  2. Space Research Institute, Profsoyuznaya 84/32, 117810 Moscow GSP-7, USSR

    • R. Z. Sagdeev
    • , L. V. Ksanfomality
    • , V. V. Afonin
    • , J. Kosorokov
    •  & E. Petrova
  3. Central Research Institute for Physics, PO Box 49, H-1525 Budapest 114, Hungary

    • J. Erö
    •  & L. Szabó
  4. Max-Planck-Institut für Aeronomie, D-3411 Katlenburg-Lindau, FRG

    • E. Keppler
    •  & G. Umlauft


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