ARTEMIS observations of lunar pick-up ions in the terrestrial magnetotail lobes

被引：41

作者：

Poppe, A. R. ^{[1
,2
]}

Samad, R. ^{[1
]}

Halekas, J. S. ^{[1
,2
]}

Sarantos, M. ^{[2
,3
,4
]}

Delory, G. T. ^{[1
,2
]}

Farrell, W. M. ^{[2
,4
]}

Angelopoulos, V. ^{[5
,6
]}

McFadden, J. P. ^{[1
]}

机构：

[1] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[2] NASA, Lunar Sci Inst, Ames Res Ctr, Mountain View, CA USA

[3] Univ Maryland Baltimore Cty, Goddard Planetary Heliophys Inst, Baltimore, MD 21228 USA

[4] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[5] Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90024 USA

[6] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2012年 / 39卷

关键词：

LEONID METEOR-SHOWER; SODIUM;

D O I：

10.1029/2012GL052909

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We report observations by the twin-probe mission ARTEMIS of pick-up ions of lunar origin obtained during times when the Moon was within the terrestrial magnetotail lobes. These ions were detected as two separate focused beams above the dayside lunar surface. Analysis of these beams has shown that they possess both field-aligned and field-perpendicular velocities, implying the presence of electric fields both parallel and perpendicular to the magnetotail lobe magnetic field. We suggest that the sources of these two electric fields are (a) the near-surface electric field due to the lunar photoelectron sheath and (b) the electric field generated by the magnetotail lobe convection velocity. We use the energy and pitch angle spectra to constrain the source locations and compositions of these ions, and conclude that exospheric ionization of the neutral exosphere is the dominant lunar pick-up ion production mechanism in the tail lobes. Citation: Poppe, A. R., R. Samad, J. S. Halekas, M. Sarantos, G. T. Delory, W. M. Farrell, V. Angelopoulos, and J. P. McFadden (2012), ARTEMIS observations of lunar pick-up ions in the terrestrial magnetotail lobes, Geophys. Res. Lett., 39, L17104, doi:10.1029/2012GL052909.

引用

页数：6

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