TY - JOUR

T1 - Simulating the Reiner Gamma Swirl

T2 - The Long-Term Effect of Solar Wind Standoff

AU - Deca, Jan

AU - Hemingway, D. J.

AU - Divin, A.

AU - Lue, C.

AU - Poppe, A. R.

AU - Garrick-Bethell, I.

AU - Lembège, B.

AU - Horányi, Mihály

N1 - Funding Information: J.?D. and M.?H. gratefully acknowledge support from NASA's Lunar Data Analysis Program, Grant 80NSSC17K0420. A.?D. was supported by RFBR Grant 19-02-00993. This work was supported in part by NASA's Solar System Exploration Research Virtual Institute (SSERVI): Institute for Modeling Plasmas, Atmosphere, and Cosmic Dust (IMPACT), Grant NNA14AB06A. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center and by TGCC and CINES under the DARI Project A0050400295. I. G.-B. acknowledges support from the BK21 plus program of the National Research Foundation (NRF) funded by the Ministry of Education of the Republic of Korea.Part of this work was inspired by discussions within International Team 437: ?Negative Ions in the Solar System? at the International Space Science Institute, Bern, Switzerland. J. D. thanks H. J. Lim for her suggestions, which helped improving the manuscript.?All data necessary to validate the findings presented in this manuscript can be found at https://doi.org/10.5281/zenodo.3631616 in accordance with the FAIR data project. Publisher Copyright: ©2020. American Geophysical Union. All Rights Reserved. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/5/1

Y1 - 2020/5/1

N2 - The Reiner Gamma swirl is a prime location to investigate the lunar albedo patterns and their colocation with magnetic anomalies. The precise relationship between impinging plasma and the swirl, and, in particular, how these interactions vary over the course of a lunar day, remains an open issue. Here we use a fully kinetic particle-in-cell code, coupled with a magnetic field model based on orbital-altitude observations, and simulate the interaction with the Reiner Gamma anomaly for all plasma regimes the region is exposed to along a typical orbit, including different solar wind incidence angles and the Moon's crossing through the terrestrial magnetosphere. Consistent with the hypothesis that swirls form as a result of plasma interactions with near-surface magnetic fields, we show that the energy flux profile produces a pattern similar to Reiner Gamma's alternating bright and darkly colored bands, but only when integrating over the full lunar orbit. We additionally show that including He (Formula presented.) as a self-consistent plasma species improves the match.

AB - The Reiner Gamma swirl is a prime location to investigate the lunar albedo patterns and their colocation with magnetic anomalies. The precise relationship between impinging plasma and the swirl, and, in particular, how these interactions vary over the course of a lunar day, remains an open issue. Here we use a fully kinetic particle-in-cell code, coupled with a magnetic field model based on orbital-altitude observations, and simulate the interaction with the Reiner Gamma anomaly for all plasma regimes the region is exposed to along a typical orbit, including different solar wind incidence angles and the Moon's crossing through the terrestrial magnetosphere. Consistent with the hypothesis that swirls form as a result of plasma interactions with near-surface magnetic fields, we show that the energy flux profile produces a pattern similar to Reiner Gamma's alternating bright and darkly colored bands, but only when integrating over the full lunar orbit. We additionally show that including He (Formula presented.) as a self-consistent plasma species improves the match.

KW - fully kinetic modeling

KW - LRO/LP/Kaguya

KW - lunar magnetic anomalies

KW - lunar swirls

KW - Reiner Gamma

KW - solar wind interaction

UR - http://www.scopus.com/inward/record.url?scp=85085480150&partnerID=8YFLogxK

U2 - 10.1029/2019JE006219

DO - 10.1029/2019JE006219

M3 - Article

AN - SCOPUS:85085480150

VL - 125

JO - Journal of Geophysical Research: Biogeosciences

JF - Journal of Geophysical Research: Biogeosciences

SN - 0148-0227

IS - 5

M1 - e2019JE006219

ER -