The effect of surface topography on the lunar photoelectron sheath and electrostatic dust transport

Poppe, A. R.; Piquette, M.; Likhanskii, Alexandre; Horányi, M.

doi:10.1016/j.icarus.2012.07.018

Cited by 93 publications

(41 citation statements)

References 46 publications

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“…The dust density profile shows depletion close to the sunlit edge, a larger density above the crater center. Our results are consistent with the scenario of [24]: a dust emission from the sunlit edge of the crater with a re-deposition on dust over the whole crater, which in the end leads to dust depletions on the crater borders and a dust concentration in the crater center.…”

Section: Simulation Of a Lander In A Crater Vicinitysupporting

confidence: 90%

New SPIS Capabilities to Simulate Dust Electrostatic Charging, Transport, and Contamination of Lunar Probes

Hess

Sarrailh

Matéo‐Vélez

et al. 2015

IEEE Trans. Plasma Sci.

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Abstract-The Spacecraft Plasma interaction Software (SPIS) has been improved to allow for the simulation of lunar and asteroid dust emission, transport, deposition and interaction with a spacecraft on or close to the lunar surface. The physics of dust charging and of the forces that they are subject to has been carefully implemented in the code. It is both a tool to address the risks faced by lunar probes on the surface, and a tool to study the dust transport physics. We hereby present the details of the physics that has been implemented in the code, as well as the interface improvements that allow for a user friendly insertion of the lunar topology and of the lander in the simulation domain. A realistic case is presented that highlights the capabilities of the code as well as some general results about the interaction between a probe and a dusty environment.

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Section: Simulation Of a Lander In A Crater Vicinitysupporting

confidence: 90%

New SPIS Capabilities to Simulate Dust Electrostatic Charging, Transport, and Contamination of Lunar Probes

Hess

Sarrailh

Matéo‐Vélez

et al. 2015

IEEE Trans. Plasma Sci.

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“…Surface charging at Earth's Moon has been extensively investigated through spacecraft observations [ Halekas et al ., , , , , , ] and through theoretical studies [ Manka , ; Farrell et al ., ; Stubbs et al ., , ; Poppe and Horányi , ; Poppe et al ., ]. These studies have generally found that the dayside lunar surface is charged a few volts positive (~10 V) and that the lunar nightside and terminator regions reach strongly negative potentials (~ −100 to −200 V).…”

Section: Discussionmentioning

confidence: 99%

“…As both the topography and overall shape of Hyperion is highly irregular, it is likely that a significant amount of local shadowing will occur, particularly inside deep craters. Such local shadowing effects have previously been investigated for the Earth's Moon [e.g., Farrell et al ., ; Poppe et al ., ], and it has been suggested that topography (e.g., craters and mountains) may produce locally enhanced electric fields due to shadowing from plasma and solar UV [ Farrell et al ., ]. As such, an estimate of the expected surface charging profile at Hyperion purely as a function of incident plasma flow and solar zenith angles may not be entirely accurate without also taking into account a more detailed shape model of the surface.…”

Section: Discussionmentioning

confidence: 99%

Detection of a strongly negative surface potential at Saturn's moon Hyperion

Nordheim

Jones

Roussos

et al. 2014

Geophysical Research Letters

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On 26 September 2005, Cassini conducted its only close targeted flyby of Saturn's small, irregularly shaped moon Hyperion. Approximately 6 min before the closest approach, the electron spectrometer (ELS), part of the Cassini Plasma Spectrometer (CAPS) detected a field-aligned electron population originating from the direction of the moon's surface. Plasma wave activity detected by the Radio and Plasma Wave instrument suggests electron beam activity. A dropout in energetic electrons was observed by both CAPS-ELS and the Magnetospheric Imaging Instrument Low-Energy Magnetospheric Measurement System, indicating that the moon and the spacecraft were magnetically connected when the field-aligned electron population was observed. We show that this constitutes a remote detection of a strongly negative (∼ −200 V) surface potential on Hyperion, consistent with the predicted surface potential in regions near the solar terminator.

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“…An accurate understanding of the emitted photoelectron spectrum from lunar soil is critical for understanding the charging and transport mechanisms of lunar dust that have been theorized for the Moon and asteroids [ Veverka et al , ; Colwell et al , ; Poppe et al , ]. Recent laboratory and simulation efforts have shown that grain‐scale “supercharging” may be responsible for electrostatic ejection and transport of individual grains [ Wang et al , ; Zimmerman et al , ].…”

Section: Discussionmentioning

confidence: 99%

Photoemission and electrostatic potentials on the dayside lunar surface in the terrestrial magnetotail lobes

Harada

Poppe

Halekas

et al. 2017

Geophysical Research Letters

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Despite the need to accurately predict and assess the lunar electrostatic environment in all ambient conditions that the Moon encounters, photoemission and electrostatic potentials on the dayside lunar surface in the terrestrial magnetotail lobes remain poorly characterized. We study characteristics and variabilities of lunar photoelectron energy spectra by utilizing Acceleration, Reconnection, Turbulence, and Electrodynamics of the Moon's Interaction with the Sun (ARTEMIS) and Apollo measurements in combination with the Flare Irradiance Spectral Model (FISM). We confirm that the photoelectron spectral shapes are consistent between ARTEMIS and Apollo and that the photoelectron flux is linearly correlated with the FISM solar photon flux. We develop an observation‐based model of lunar photoelectron energy distributions, thereby deriving the current balance surface potential. The model predicts that dayside lunar surface potentials in the tail lobes (typically tens of volts) could increase by a factor of 2–3 during strong solar flares.

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The effect of surface topography on the lunar photoelectron sheath and electrostatic dust transport

Cited by 93 publications

References 46 publications

New SPIS Capabilities to Simulate Dust Electrostatic Charging, Transport, and Contamination of Lunar Probes

New SPIS Capabilities to Simulate Dust Electrostatic Charging, Transport, and Contamination of Lunar Probes

Detection of a strongly negative surface potential at Saturn's moon Hyperion

Photoemission and electrostatic potentials on the dayside lunar surface in the terrestrial magnetotail lobes

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