Journal article
Does Magnetic Reconnection Occur in the Near Lunar Surface Environment?
Geophysical research letters, Vol.50(16), e2023GL104733
08/28/2023
DOI: 10.1029/2023GL104733
Appears in UI Libraries Support Open Access
Abstract
The near lunar surface contains small‐scale magnetic field structures that provide a natural test bed for observing plasmas with a non‐zero Hall electric field, as well as potentially facilitating electron‐only reconnection. This study presents observational evidence of magnetized electrons as well as demagnetized ions when THEMIS‐ARTEMIS probe B reached an altitude of ∼15 km above the lunar surface. Additionally, observations suggest the presence of a field line topology change and traversal of a closed magnetic field structure containing solar wind electrons, suggestive of magnetic reconnection having occurred at some point between the solar wind interplanetary magnetic field and a lunar crustal magnetic field. Thus, the observations presented here are consistent with previous studies that predict prominent Hall electric fields near lunar crustal magnetic fields and further suggest that the solar wind interplanetary magnetic field may reconnect with lunar crustal magnetic fields, most likely via electron‐only reconnection.
Plain Language Summary
While interactions between the solar wind and the Earth's magnetosphere have been well studied, there is still much to be learned by studying the interactions between the solar wind and the small‐scale lunar magnetic fields. Due to the small‐scale nature of the lunar magnetic fields, previous studies have suggested that the ions do not respond in the same manner as the electrons. The resulting effects lead to an electric field near regions of lunar magnetic fields. This study presents observational evidence of the aforementioned phenomena. Additionally, the spacecraft observations also suggest that magnetic reconnection, or the breaking of the lunar magnetic field lines and reconnection to the magnetic field in the solar wind, was occurring between the solar wind and the lunar magnetic fields.
Key Points
Observations suggest magnetic reconnection occurs between the solar wind IMF and lunar crustal magnetic fields
Electron pitch angle and velocity distributions suggest the spacecraft traversed a closed magnetic topology containing solar wind electrons
We report in‐situ observations of demagnetized ions and associated Hall electric fields near the lunar surface
Details
- Title: Subtitle
- Does Magnetic Reconnection Occur in the Near Lunar Surface Environment?
- Creators
- Rhyan P Sawyer - University of Iowa, Physics and AstronomyJ. S. Halekas - University of Iowa, Physics and AstronomyJ. W. Bonnell - University of California, BerkeleyL. J. Chen - Goddard Space Flight CenterJ. McFadden - University of California, BerkeleyK. H. Glassmeier - Technische Universität BraunschweigY. Harada - Kyoto UniversityA. Stanier - Los Alamos National Laboratory
- Resource Type
- Journal article
- Publication Details
- Geophysical research letters, Vol.50(16), e2023GL104733
- DOI
- 10.1029/2023GL104733
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- Publisher
- Wiley
- Number of pages
- 7
- Grant note
- German Ministerium für Wirtschaft und Klimaschutz University of Iowa National Aeronautics and Space Administration (NAS5‐02099) Deutsches Zentrum für Luft und Raum‐fahrt (50 OC 1403) Solar System Exploration Research Virtual Institute (80NSSC20M0022)
- Language
- English
- Date published
- 08/28/2023
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984454316202771
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