MESSENGER Observations of Mercury's Exosphere: Detection of Magnesium and Distribution of Constituents

被引：76

作者：

McClintock, William E. ^{[1
]}

Vervack, Ronald J., Jr. ^{[2
]}

Bradley, E. Todd ^{[3
]}

Killen, Rosemary M. ^{[4
]}

Mouawad, Nelly ^{[4
]}

Sprague, Ann L. ^{[5
]}

Burger, Matthew H. ^{[4
]}

Solomon, Sean C. ^{[6
]}

Izenberg, Noam R. ^{[2
]}

机构：

[1] Univ Colorado, Atmospher & Space Phys Lab, Boulder, CO 80303 USA

[2] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA

[3] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA

[4] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[5] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[6] Carnegie Inst Washington, Dept Terr Magnetism, Washington, DC 20015 USA

来源：

SCIENCE | 2009年 / 324卷 / 5927期

关键词：

SODIUM TAIL; ATMOSPHERE; DISCOVERY; POTASSIUM; EMISSION; MISSION; CALCIUM; FLYBY; RATES; NA;

D O I：

10.1126/science.1172525

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Mercury is surrounded by a tenuous exosphere that is supplied primarily by the planet's surface materials and is known to contain sodium, potassium, and calcium. Observations by the Mercury Atmospheric and Surface Composition Spectrometer during MESSENGER's second Mercury flyby revealed the presence of neutral magnesium in the tail (anti-sunward) region of the exosphere, as well as differing spatial distributions of magnesium, calcium, and sodium atoms in both the tail and the nightside, near-planet exosphere. Analysis of these observations, supplemented by observations during the first Mercury flyby, as well as those by other MESSENGER instruments, suggests that the distinct spatial distributions arise from a combination of differences in source, transfer, and loss processes.

引用

页码：610 / 613

页数：4

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