Dust observations at orbital altitudes surrounding Mars

L. Andersson, T. D. Weber, D. Malaspina, F. Crary, R. E. Ergun, G. T. Delory, C. M. Fowler, M. W. Morooka, T. McEnulty, A. I. Eriksson, D. J. Andrews, M. Horanyi, A. Collette, Roger Yelle, B. M. Jakosky

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Dust is common close to the martian surface, but no known process can lift appreciable concentrations of particles to altitudes above ~150 kilometers.We present observations of dust at altitudes ranging from 150 to above 1000 kilometers by the Langmuir Probe and Wave instrument on the Mars Atmosphere and Volatile Evolution spacecraft. Based on its distribution, we interpret this dust to be interplanetary in origin. A comparison with laboratory measurements indicates that the dust grain size ranges from 1 to 12 micrometers, assuming a typical grain velocity of ~18 kilometers per second. These direct observations of dust entering the martian atmosphere improve our understanding of the sources, sinks, and transport of interplanetary dust throughout the inner solar system and the associated impacts on Mars's atmosphere.

Original languageEnglish (US)
Article numberA5
JournalScience
Volume350
Issue number6261
DOIs
StatePublished - Nov 6 2015

ASJC Scopus subject areas

  • General

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    Andersson, L., Weber, T. D., Malaspina, D., Crary, F., Ergun, R. E., Delory, G. T., Fowler, C. M., Morooka, M. W., McEnulty, T., Eriksson, A. I., Andrews, D. J., Horanyi, M., Collette, A., Yelle, R., & Jakosky, B. M. (2015). Dust observations at orbital altitudes surrounding Mars. Science, 350(6261), [A5]. https://doi.org/10.1126/science.aad0398