期刊
GEOPHYSICAL RESEARCH LETTERS
卷 40, 期 17, 页码 4544-4548出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50892
关键词
Moon; reflected protons; Low Frequency Waves; Wake
资金
- NASA [NNX13AJ97G]
- German Ministry for Economy and Technology
- German Center for Aviation and Space [50 OC 1001]
- NASA [471632, NNX13AJ97G] Funding Source: Federal RePORTER
For the unique case of magnetic field parallel to the solar wind flow, a column of reflected protons can accumulate upstream from the Moon. We investigate observations from the ARTEMIS probes for an extended period with this geometry. During this time, P2 observes strong wave turbulence in two frequency bands above and below the ion cyclotron frequency near the Moon, not seen by P1 farther from the Moon. The lower frequency oscillations prove consistent with kinetic magnetosonic waves resonantly generated by reflected protons, and test particle calculations confirm that a significant column of reflected protons lies upstream when the waves occur. The reflected protons perturb a large volume of plasma around the Moon, extending upstream as well as into the wake. The waves observed near the Moon during this time period have many similarities to those found in the terrestrial foreshock and at comets, suggesting the potential for comparative studies.
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