A possible explanation for the inconsistency between the Giotto grain mass distribution and ground-based observations

Details A possible explanation for the inconsistency between the Giotto grain mass distribution and ground-based observations A possible explanation for the inconsistency between the Giotto grain mass distribution and ground-based observations

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ioch.rept..178p&link_type=abstract

In NASA, Washington, Infrared Observations of Comets Halley and Wilson and Properties of the Grains p 178-180 (SEE N89-13330 04-

Physics

1

Cosmic Dust, Grain Size, Halley'S Comet, Mass Distribution, Comet Nuclei, Giotto Mission, Momentum Transfer, Particle Size Distribution

Scientific paper

Giotto measured the in situ Halley dust grain mass distribution with 2 instruments, Particle Impact Analyzer and Dust Impact Detection System (DIDSY), as well as the total intercepted mass from the deceleration of the spacecraft (Giotto Radio-Science Experiment, GRE). Ground based observations made shortly before encounter have fluxes much higher than would be predicted from Giotto data. It is concluded that Giotto DIDSY and GRE data represent observations of dust originating from a narrow track along the nucleus. They are consistent with ground based data, if assumptions are made about the level of activity along this track. The actual size distribution that should be used for modeling of the whole coma should not include the large mass excess actually observed by Giotto. Extrapolation of the small grain data should be used, since for these grains the velocity dispersion is low and temporal changes at the nucleus would not affect the shape of the mass distribution.

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