Lunar dust lofting due to surface electric field and charging within Micro-cavities between dust grains above the terminator region

Örger, Necmi Cihan; Alarcon, Jose Rodrigo Cordova; Toyoda, Kazuhiro; Cho, Mengu

doi:10.1016/j.asr.2018.05.027

Cited by 28 publications

(6 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(i) a dusty surface is not flat plane but consisting of microscopic irregular structures formed by the shape of each grains, and therefore, a space like a cave, so-called microcavity, frequently appears beneath a dust grain (Figure D1), (ii) when UV or plasma irradiates the dusty surface, it hardly hits micro-cavities but photoelectrons or secondary electrons emitted by it easily hits micro-cavities, (iii) these micro-cavities tend to be charged up negatively, and (iv) then, the Coulomb repulsion within the cavity lifts a dust grain in the top. The CPM has been further advanced by Schwan et al (2017) and Orger et al (2018) theoretically and Orger et al (2021 experimentally. Also, they conclude that dust grains are levitated by UV or plasma irradiation alone.…”

Section: Appendix D the Charge Patch Model And Effect Of Cohesionmentioning

confidence: 99%

Dust release from cold ring particles as a mechanism of spoke formation in Saturn's rings

Hirata¹,

Kimura²,

Ohtsuki³

2022

Icarus

View full text Add to dashboard Cite

Section: Appendix D the Charge Patch Model And Effect Of Cohesionmentioning

confidence: 99%

Dust release from cold ring particles as a mechanism of spoke formation in Saturn's rings

Hirata¹,

Kimura²,

Ohtsuki³

2022

Icarus

View full text Add to dashboard Cite

“…The particles have mass densities of ρ m = 3000 kg m −3 following previous works on dust ejection or electrostatic dust lofting simulations (e.g., Jewitt et al 2013;Senshu et al 2015;Hui & Li 2017;Orger et al 2018). The assumed mass density ρ m is close to the (25143) Itokawa sample (3400 kg m −3 Tsuchiyama et al 2011).…”

Section: Selection Of Particle Parametersmentioning

confidence: 94%

Thermal radiation pressure as a possible mechanism for losing small particles on asteroids

Bach

Ishiguro

2021

A&A

View full text Add to dashboard Cite

Context. Recent observations of dust ejections from active asteroids, including (3200) Phaethon, have drawn considerable interest from planetary astronomers studying the generation and removal of small dust particles on asteroids. Aims. In this work, we aim to investigate the importance of thermal radiation pressure from asteroid regolith (AR) acting on small dust particles over the surface of the AR. In particular, we aim to understand the role of thermal radiation in the near-Sun environment. Methods. We describe the acceleration of particles over the AR within the radiation fields (direct solar, reflected (scattered) solar, and thermal radiation) in addition to the asteroid’s rotation and gravitational field. Mie theory is used because the particles of interest have sizes comparable to thermal wavelengths (~1–100 μm), and thus the geometric approximation is not applicable. A new set of formalisms is developed for the purpose. Results. We find that the acceleration of particles with spherical radius ≲1 μm to ~10 μm is dominated by the thermal radiation from the AR when the asteroid is in the near-Sun environment (heliocentric distance rh ≲ 0.8 au). Under thermal radiation dominance, the net acceleration is towards space, that is, outwards from the AR. This outward acceleration is the strongest for particles of ~1 μm in radius, regardless of other parameters. A preliminary trajectory integration using the Phaethon-like model shows that such particles escape from the gravitational field within about 10 min. Our results are consistent with the previous observational studies on Phaethon in that the ejected dust particles have a spherical radius of ~1 μm.

show abstract

“…Recently, the recognition of the roles micro-cavities play in surface charging led to a better understanding of particle liftoff from surfaces due to plasma effects, the so-called patched charge model [59]. The model, verified by a series of experiments (figure 4) [60][61][62][63][64][65][66], is based on the emission and re-absorption of secondary electrons, generated by impacting energetic ( 1 eV) electrons, ions or UV photons. As opposed to the case of a flat surface, secondary electrons can remain trapped in cavities that form between dust particles, generating a potential difference of the order of 2-3 V, due to the typical energy of secondary electrons.…”

Section: Near-surface Dust Mobilizationmentioning

confidence: 99%

The lunar dust environment: concerns for Moon-based astronomy

Horányi,

Szalay,

Wang

2024

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

The Moon has no atmosphere, hence, it offers a unique opportunity to place telescopes on its surface for astronomical observations. It is phase-locked with Earth, and its far side remains free from ground-based interference, enabling the optimal use of radio telescopes. However, the surface of the Moon, as any other airless planetary object in the solar system, is continually bombarded by interplanetary dust particles that cause impact damage and generate secondary ejecta particles that continually overturn the top layer of the lunar regolith. In addition, there is evidence, that small particles comprising the lunar regolith can be electrically charged, mobilized and transported, also representing a hazard for covering sensitive surfaces and interfering with exposed mechanical structures. In addition to the naturally occurring dust transport, rocket firings during landings and take-offs, pedestrian and motorized vehicle traffic will also liberate copious amounts of dust, representing a potential hazard for the safe and optimal use of optical platforms. This article is part of a discussion meeting issue ‘Astronomy from the Moon: the next decades (part 2)’.

show abstract

Lunar dust lofting due to surface electric field and charging within Micro-cavities between dust grains above the terminator region

Cited by 28 publications

References 43 publications

Dust release from cold ring particles as a mechanism of spoke formation in Saturn's rings

Dust release from cold ring particles as a mechanism of spoke formation in Saturn's rings

Thermal radiation pressure as a possible mechanism for losing small particles on asteroids

The lunar dust environment: concerns for Moon-based astronomy

Contact Info

Product

Resources

About