Dust Measurements in the Coma of Comet 81P/Wild 2 by the Dust Flux Monitor Instrument-Reference-Cited by-同舟云学术

Dust Measurements in the Coma of Comet 81P/Wild 2 by the Dust Flux Monitor Instrument

Published:2004-06-18 Issue:5678 Volume:304 Page:1776-1780
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Tuzzolino Anthony J.¹²³⁴⁵,Economou Thanasis E.¹²³⁴⁵,Clark Ben C.¹²³⁴⁵,Tsou Peter¹²³⁴⁵,Brownlee Donald E.¹²³⁴⁵,Green Simon F.¹²³⁴⁵,McDonnell J. A. M.¹²³⁴⁵,McBride Neil¹²³⁴⁵,Colwell Melusine T. S. H.¹²³⁴⁵

Affiliation:

1. Laboratory for Astrophysics and Space Research, Enrico Fermi Institute, University of Chicago, 933 East 56th Street, Chicago, IL 60637, USA.

2. Lockheed Martin Astronautics, Post Office Box 179, MS-B0560, Denver, CO 80201, USA.

3. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109–8099, USA.

4. Astronomy and Astrophysics Department, University of Washington, Seattle, WA 98195, USA.

5. Planetary and Space Sciences Research Institute, Open University, Walton Hall, Milton Keynes MK7 6AA, UK.

Abstract

We present measurements of the dust particle flux and mass distribution from the Stardust Dust Flux Monitor Instrument (DFMI) throughout the flyby of comet 81P/Wild 2. In the particle mass regime from 10 –14 to 10 –7 kilograms, the spacecraft encountered regions of intense swarms of particles, together with bursts of activity corresponding to clouds of particles only a few hundred meters across. This fine-scale structure can be explained by particle fragmentation. We estimate that 2800 ± 500 particles of diameter 15 micrometers or larger impacted the aerogel collectors, the largest being ∼6 × 10 –7 kilograms, which dominates the total collected mass.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference25 articles.

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2. In each test of the onset of noisy operation the power consumption increased drastically and the spacecraft flight software generated multiple error event reports (EVRs). A software patch was implemented to turn the DFMI off if it went into a noisy state. The noise started in all counters at the same time and in the most sensitive case (m1 counter) it saturated the counter in a few seconds. Nothing similar was observed during the Wild 2 encounter: We have not seen any noise no EVRs were generated and the instrument was not turned off by the software patch. In addition the calibration performed immediately after the encounter showed nominal expected performance and the instrument was turned off before it went noisy some 2000 s after it was turned on.

3. More information is available at http://stardust.jpl.nasa.gov/news/news94.html.

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