期刊
SCIENCE
卷 333, 期 6051, 页码 1862-1865出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1211302
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资金
- NASA [NAS5-97271, NASW-00002]
Global measurements by MESSENGER of the fluxes of heavy ions at Mercury, particularly sodium (Na(+)) and oxygen (O(+)), exhibit distinct maxima in the northern magnetic-cusp region, indicating that polar regions are important sources of Mercury's ionized exosphere, presumably through solar-wind sputtering near the poles. The observed fluxes of helium (He(+)) are more evenly distributed, indicating a more uniform source such as that expected from evaporation from a helium-saturated surface. In some regions near Mercury, especially the nightside equatorial region, the Na(+) pressure can be a substantial fraction of the proton pressure.
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