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Mercury's complex exosphere: Results from MESSENGER's third flyby

Science, ISSN: 0036-8075, Vol: 329, Issue: 5992, Page: 672-675
2010
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Article Description

During MESSENGER's third flyby of Mercury, the Mercury Atmospheric and Surface Composition Spectrometer detected emission from ionized calcium concentrated 1 to 2 Mercury radii tailward of the planet. This measurement provides evidence for tailward magnetospheric convection of photoions produced inside the magnetosphere. Observations of neutral sodium, calcium, and magnesium above the planet's north and south poles reveal altitude distributions that are distinct for each species. A two-component sodium distribution and markedly different magnesium distributions above the two poles are direct indications that multiple processes control the distribution of even single species in Mercury's exosphere.

Bibliographic Details

Ronald J. Vervack Jr.; William E. McClintock; Rosemary M. Killen; Ann L. Sprague; Brian J. Anderson; Matthew H. Burger; E. Todd Bradley; Nelly Mouawad; Sean C. Solomon; Noam R. Izenberg

American Association for the Advancement of Science (AAAS)

Multidisciplinary

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