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Sunday, May 17, 2020 | History

2 edition of Magnetic studies of lunar samples found in the catalog.

Magnetic studies of lunar samples

David W. Strangway

Magnetic studies of lunar samples

final report to National Aeronautics and Space Administration.

by David W. Strangway

  • 378 Want to read
  • 37 Currently reading

Published by Massachusetts Institute of Technology, Dept. of Geology and Geophysics in Cambridge, Mass .
Written in English

    Subjects:
  • Moon -- Magnetic properties

  • Edition Notes

    ContributionsMassachusetts Institute of Technology, United States. National Aeronautics and Space Administration
    The Physical Object
    Pagination1 v. (various pagings) illus. ;
    ID Numbers
    Open LibraryOL20740937M

    Studies of lunar samples indicate that the oldest rocks on the lunar surface are gabbroic anorthosites and anorthosites of the lunar highlands, which are remnants of a widespread crust formed about Ga (Taylor, ; Taylor & McLennan, ). This primitive crust appears to have formed in response to catastrophic heating that led to.   A new analysis of lunar rocks returned from the Apollo 11 mission suggest the moon did once possess an ancient magnetic field that was much stronger than scientists previously thought.

    a The A/D resolution of the lidar receiver was 14 bits (40 m per bit), whereas all of the cameras had a resolution of 8 bits. b The laser used for the lidar was an Nd-YAG that produced a pulse of radiation with a duration of. Credit: Benjamin Weiss and created by Hernan Canellas. Unlike the Earth, the moon does not currently have a magnetosphere—the planet’s magnetism that makes compasses work, and helps shield our upper atmosphere from solar wind. The moon’s weak magnetism recorded at the Apollo 15 landing site is thought to be contamination from fields emanating from the Earth, the sun, and the galaxy as a.

    Consequently the initial investigation of Apollo 11 rocks was directed towards the use of rock magnetic studies as an adjunct to petrological examination. One of the most notable findings of the Apollo programme was the demonstration of the existence of a natural remanent magnetization (NRM) in Apollo 11 lavas and breccias. The discovery of lunar magnetic fields of crustal origin was a major scientific surprise of the Apollo program. Solving the enigma of lunar remanent crustal magnetization will provide fundamental insights into the thermal history of the lunar core/dynamo, mantle, and crust, and into the processes by which crustal magnetization is acquired on airless bodies - for instance, large basin-forming.


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Magnetic studies of lunar samples by David W. Strangway Download PDF EPUB FB2

Magnetic Studies of LunarSamples Abstract. The retnanent magnetismn of a lunar type C breccia samnple includes a large viscous component with a time constant of several hours, and a high coercivity remanence, possibly acquired by impact processes on the lunar surface.

to AE ago the strength of the surface lunar magnetic field was about Oe, while there is evidence from younger rocks that a field of about one quarter of this value was present at a later time ( AE).

One of the objectives of magnetic studies on lunar samples is the determination of the intensity of the ancient lunar field present. The Lunar Sample Laboratory Facility (LSLF) is a repository and laboratory facility at NASA's Lyndon B. Johnson Space Center in Houston, Texas, opened in to house geologic samples returned from the Moon by the Apollo program missions to the lunar surface between and The facility preserves most of the kilograms ( lb) of lunar material returned over the course of Apollo Address: Lyndon B.

Johnson Space Center. Proton magnetic resonance searches at 60 megahertz of these samples have not revealed any signals ascribable to water or any other types of hydrogen in concentrations greater than percent by weight contained in narrow lines (5 oersteds wide or less) and percent by weight in wide lines (as wide as oersteds).

A breccia sample () from the moon was found to have a strong and fairly stable remanent magnetization. If this sample was not magnetized by local fields in the spacecraft or in the lunar receiving laboratory, it must have been magnetized on the moon.

This could have happened in a variety of ways, such as cooling through the Curie temperature, by comitinuous thermal cycling, or by impact Cited by: Lunar research was one of the hallmarks of the Lunar and Planetary Laboratory in its first decade (the s) as the United States prepared for the Apollo missions and LPL led the way in mapping possible landing sites.

In the half-century since, the kinds of lunar research performed have changed, but the Moon is still an object of intense scrutiny. Not Available adshelp[at] The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86ACited by: conclude in section six by summarizing the remaining problems in lunar magnetism and provide guidance for future studies.

2 Paleomagnetism Paleomagnetic analyses of lunar samples provide constraints on the past surface magnetic field of the Moon. In this section, we first review the properties of the magnetic carriers in lunar rocks as well as the. The Moon bears substantial natural resources which could be exploited in the future.

Potential lunar resources may encompass processable materials such as volatiles and minerals, along with geologic structures such as lava tubes that together, might enable lunar use of resources on the Moon may provide a means of reducing the cost and risk of lunar exploration and beyond.

Magnetic studies of lunar samples. Doell RR, Grommé CS, Thorpe AN, Senftle FE. The remanent magnetismn of a lunar type C breccia sample includes a large viscous component with a time constant of several hours, and a high coercivity remanence, possibly acquired by impact processes on the lunar by: A lunar surface field comparable in intensity to the earth's magnetic field, existing from to AE, is suggested by paleointensity estimation measurements of more than 50 lunar samples by.

Not Available adshelp[at] The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86AAuthor: D. Strangway. Magnetic Properties of Lunar Dust and Rock Samples Article (PDF Available) in Science () February with 41 Reads How we measure 'reads'.

The rock magnetism and paleomagnetism of the Apollo samples is reviewed and evidence is presented for an era of strong lunar magnetic fields between and By.

The most plausible model for these fields is a short lived lunar dynamo, which may have been driven by compositional convection associated with the freezing of a lunar by:   Sample Requests for Research. NASA provides lunar rock, soil, and regolith-core samples for both destructive and non-destructive analysis in pursuit of new scientific knowledge.

Requests are considered for both basic studies in planetary science and applied studies in lunar materials beneficiation and resource utilization. The lunar sample building at Johnson Space Center is the chief repository for the Apollo samples.

The lunar sample laboratory is where pristine lunar samples are prepared for shipment to scientists and educators. Nearly samples are distributed each year for research and teaching projects.

Astronaut collecting lunar soil sample. Title: Lunar magnetism—a retrospective view of the Apollo sample magnetic studies: Authors: Fuller, M. Publication: Physics and Chemistry of The Earth, vol. 23, issuepp. This lunar dust, like so much else on the Moon, is the product of impacts.

Each cratering event, large or small, breaks up the rock of the lunar surface and scatters the fragments. Ultimately, billions of years of impacts have reduced much of the surface layer to particles about the size of dust or sand.

Such a field could have been of internal origin in the moon, or it could have been a residual effect from the earth's magnetic field at a time when the moon and the earth were much closer together.

Thermomagnetic studies identify the presence of iron with about 1 percent nickel (igneous). iron with abiout 5 to 10 percent nickel (meteoritic Cited by: Lunar Sourcebook is intended for the post-Apollo generation of scientists, engineers, teachers, and students. It has two purposes. It has two purposes.

First, it summarizes what we know about the Moon as a result of U.S. and U.S.S.R. lunar missions and the continuing analysis of. The Contents of This Book Chapter 2: Exploration, Samples, and Recent Concepts of the Moon. Lunar Exploration Lunar Samples New Views of the Moon from Exploration New Concepts of the Moon Following Exploration Chapter 3: The Lunar Environment.

Earth and Moon Compared The Astronaut Experience Terrain Dust Temperatures on the Lunar Surface Lunar. Until recently, the scientists were unable to find lunar samples much younger than billion years old that could accurately record the moon's magnetic fields.

"There are very few lunar rocks.Figure 1: Lunar Orbiter photomozaic of Orientale Basin showing groved ejecta pattern (Hevelius Formation). JPL photo # LOM Disclaimers Introduction to Compendium The purpose of the Lunar Sample Compendium will be to inform scientists, astronauts and the public about the various lunar samples that have been returned from the Size: 1MB.