Cometary impact effects at the Moon: Implications for lunar swirl formation

Syal, Megan Bruck; Schultz, P. H.

doi:10.1016/j.icarus.2015.05.005

Cited by 36 publications

(15 citation statements)

References 106 publications

(175 reference statements)

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“…regolith (Pieters et al, 2009; Figure 1). Similar features in the infrared spectra were found in the 192 data from Cassini VIMS (Clark, 2009) and HRI-IR spectrometer on Deep Impact (Sunshine et al, 193 2009 Syal et al, 2015). New evidence from LADEE is consistent with meteoritic delivery of water to 207 the Moon (Benna et al, 2015).…”

Section: Selma: How Do Airless Bodies Interact With Space Environment?mentioning

confidence: 57%

SELMA mission: How do airless bodies interact with space environment? The Moon as an accessible laboratory

Futaana¹,

Barabash²,

Wieser³

et al. 2018

Planetary and Space Science

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Section: Selma: How Do Airless Bodies Interact With Space Environment?mentioning

confidence: 57%

SELMA mission: How do airless bodies interact with space environment? The Moon as an accessible laboratory

Futaana¹,

Barabash²,

Wieser³

et al. 2018

Planetary and Space Science

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“…The strongest anomalies are~10-20 nT at 30-km altitude and may be on the order of 1,000 nT at the surface (Blewett et al, 2018). Several hypotheses exist for the formation of lunar magnetic anomalies, including basin ejecta magnetized in the impact process (Hood et al, 2001); surface magnetization imprinted by comet-impact plasma interactions (Bruck Syal & Schultz, 2015;Schultz & Srnka, 1980); igneous intrusion (Purucker et al, 2012;Srnka et al, 1979); or metallic iron impactor remnants (Oliveira et al, 2017;Wieczorek et al, 2012) magnetized in an ancient global field. Several magnetic anomalies are colocated with enigmatic reflectance features called swirls (Blewett et al, 2011;Denevi et al, 2016;El-Baz, 1972;Hood et al, 1979aHood et al, , 1979bHood & Williams, 1989).…”

Section: Relevance To Exploration Themesmentioning

confidence: 99%

Lunar Science for Landed Missions Workshop Findings Report

Jawin

Valencia

Clegg-Watkins

et al. 2019

Earth and Space Science

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The Lunar Science for Landed Missions workshop was convened at the National Aeronautics and Space Administration Ames Research Center on 10–12 January, 2018. Interest in the workshop was broad, with 110 people participating in person and 70 people joining online. In addition, the workshop website (https://lunar-landing.arc.nasa.gov) includes video recordings of many of the presentations. This workshop defined a set of targets that near‐term landed missions could visit for scientific exploration. The scope of such missions was aimed primarily, but not exclusively, at commercial exploration companies with interests in pursuing ventures on the surface of the Moon. Contributed and invited talks were presented that detailed many high priority landing site options across the surface of the Moon that would meet scientific goals in a wide variety of areas, including impact cratering processes and dating, volatiles, volcanism, magnetism, geophysics, and astrophysics. Representatives from the Japan Aerospace Exploration Agency and the European Space Agency also presented about international plans for lunar exploration and science. This report summarizes the set of landing sites and/or investigations that were presented at the workshop that would address high priority science and exploration questions. In addition to landing site discussions, technology developments were also specified that were considered as enhancing to the types of investigations presented. It is evident that the Moon is rich in scientific exploration targets that will inform us on the origin and evolution of the Earth‐Moon system and the history of the inner Solar System, and also has enormous potential for enabling human exploration and for the development of a vibrant lunar commercial sector.

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“…However, an impediment in using magnetic anomalies to study the ancient lunar field is that their geologic formation mechanism is not known. Hypotheses for their formation include intrusive volcanism 7 , crater melt sheets 8 , ejecta deposits 1 , 9 – 11 , and cometary interactions with the surface 12 .The antipodes of the Imbrium, Serenitatis, Orientale, and Crisium basins all exhibit large provinces of crustal magnetism 5 , 13 , 14 and in some cases modified terrain 5 , 15 , 16 . A hypothesis for the formation of these provinces is that basin ejecta may have accumulated at the basin antipode, which then became magnetized by cooling in an ambient field.…”

Section: Introductionmentioning

confidence: 99%

Impactor material records the ancient lunar magnetic field in antipodal anomalies

et al. 2021

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The Moon presently has no dynamo, but magnetic fields have been detected over numerous portions of its crust. Most of these regions are located antipodal to large basins, leading to the hypothesis that lunar rock ejected during basin-forming impacts accumulated at the basin antipode and recorded the ambient magnetic field. However, a major problem with this hypothesis is that lunar materials have low iron content and cannot become strongly magnetized. Here we simulate oblique impacts of 100-km-diameter impactors at high resolution and show that an ~700 m thick deposit of potentially iron-rich impactor material accumulates at the basin antipode. The material is shock-heated above the Curie temperature and therefore may efficiently record the ambient magnetic field after deposition. These results explain a substantial fraction of the Moon’s crustal magnetism, and are consistent with a dynamo field strength of at least several tens of microtesla during the basin-forming epoch.

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Cometary impact effects at the Moon: Implications for lunar swirl formation

Cited by 36 publications

References 106 publications

SELMA mission: How do airless bodies interact with space environment? The Moon as an accessible laboratory

SELMA mission: How do airless bodies interact with space environment? The Moon as an accessible laboratory

Lunar Science for Landed Missions Workshop Findings Report

Impactor material records the ancient lunar magnetic field in antipodal anomalies

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