Statistical characterization of the foremoon particle and wave morphology: ARTEMIS observations

Y Harada; J. S Halekas; A. R Poppe; Y Tsugawa; S Kurita; J. P McFadden

doi:10.1002/2015JA021211

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Statistical characterization of the foremoon particle and wave morphology: ARTEMIS observations

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Statistical characterization of the foremoon particle and wave morphology: ARTEMIS observations

Y Harada, J. S Halekas, A. R Poppe, Y Tsugawa, S Kurita and J. P McFadden

Journal of geophysical research. Space physics, Vol.120(6), pp.4907-4921

06/2015

DOI: 10.1002/2015JA021211

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Abstract

Although the zeroth-order picture of the Moon-solar wind interaction involves no upstream perturbation, the presence of the Moon does affect the upstream plasma in a variety of ways. In this paper, a large volume of data obtained by the dual-probe Acceleration, Reconnection, Turbulence and Electrodynamics of the Moon's Interaction with the Sun (ARTEMIS) mission are used to characterize the large-scale morphology of the "foremoon," which is defined as the region upstream of the Moon and its wake that contains Moon-related particles and waves. Solar wind ions reflected from the unshielded surface and by crustal magnetic fields, together with heavy ions of lunar surface/exospheric origin, are picked up by the solar wind magnetic and electric fields. Partially coinciding with populations of these Moon-related ions, ∼0.01 Hz and ∼1 Hz magnetic field fluctuations are observed. The morphology of the Moon-related ion and wave distributions is well organized by the upstream magnetic field direction. In addition, the low-frequency wave distributions depend on the upstream Alfvén Mach numbers, suggesting that propagation effects also play a role in determining the wave foremoon morphology. Occurrence of modified electron velocity distributions and higher-frequency, electromagnetic, and electrostatic waves is primarily controlled by magnetic connection to the Moon and its wake. These statistical results observationally demonstrate the large-scale properties of the foremoon and upstream-parameter control thereof. Key Points ARTEMIS observes a wide variety of lunar upstream particles and waves Global distributions of lunar upstream phenomena are organized by IMF direction Low-frequency wave distributions are controlled by Mach numbers

Details

Title: Subtitle: Statistical characterization of the foremoon particle and wave morphology: ARTEMIS observations
Creators: Y Harada - University of California, Berkeley
J. S Halekas - University of Iowa
A. R Poppe - University of California, Berkeley
Y Tsugawa - Tohoku University
S Kurita - Nagoya University
J. P McFadden - University of California, Berkeley
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.120(6), pp.4907-4921
DOI: 10.1002/2015JA021211
ISSN: 2169-9380
eISSN: 2169-9402
Grant note: DOI: 10.13039/100000104, name: NASA, award: NAS5-02099; name: Technical University of Braunschweig; name: German Ministry for the Economy and Technology; name: German Center for Aviation and Space, award: 50 OC 0302; name: NASA LASER, award: NNX13AJ97G
Language: English
Date published: 06/2015
Academic Unit: Physics and Astronomy
Record Identifier: 9984199733602771

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