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  • LUNAR AND PLANETARY EXPLORATION  (7)
  • Lunar and Planetary Science and Exploration  (5)
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  • 1
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    Ferromagnetic phase-mass equivalence and lunar sample magnetic remanence (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Man-made alloy spheres simulating the compositions of particles found in the lunar soil and weighting approximately 10 mg are shown to be equivalent, insofar as remanence intensity and demagnetization stability are concerned, to more than about 10 billion submicrometer spherical iron particles. The large particles not only contain large stable magnetic remanence, but when the polished surfaces of these particles are etched and carefully studied, they provide useful petrogenetic information, imply the mechanism of magnetization, the time-temperature history, and outline the format for possible paleointensity analysis. The intensity and stability of the remanence in these large spheres is related to the microstructure developed during rapid cooling.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters; 2; Mar. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Magnetochemistry of the Apollo landing sites (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A coherent magnetochemical picture of lunar samples is presented which was determined from a synthesis of available magnetic-property data and corresponding chemical and petrographic data for soils and rock samples collected at the Apollo landing sites. The magnetic properties of the samples are correlated with Al/Si ratio as well as with telescope spectral reflectivity curves, and magnetochemical diagrams based on composition-sensitive magnetic parameters describing the Fe metal and Fe(2+) contents are used to classify the samples. It is shown that the relative metal-fraction size distribution and magnetic stability for different rock types and soils of varying Al/Si values are reflected in a plot of the ratio of saturation isothermal remanence to saturation magnetization vs the ratio of remanent coercive force to coercive force. It is concluded that all the Apollo landing sites have distinct telescope curves correlated with petrology, chemistry, Al/Si values, and magnetic properties. The established correlations suggest the possibility of estimating the magnetic properties of the regolith from remote-sensing observations.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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    NASA TECHNICAL REPORTS
  • 3
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    The magnetic characteristics of returned lunar samples and their implications for regolith processes (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 4
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    Magnetism of Carbonados (2000)
    In:  Other Sources
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    Publication Date: 2017-10-02
    Description: Origin of Carbonado is not clear. Magnetism of Carbonado comes from the surface, indicating contemporary formation of both the surface and magnetic carriers. The interior of carbonado is relatively free of magnetic phases.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXI; LPI-Contrib-1000
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  • 5
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    Origin of Magnetic Linear Pattern on Mars (2000)
    In:  Other Sources
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    Publication Date: 2017-10-02
    Description: The magnetic anomaly maxima and minima form a planet wide signature. Large impact basins modify this pattern. We analyze magnetic carriers and their concentrations in a 30 km thick crust. A model of Martian history explains the magnetic patterns.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXI; LPI-Contrib-1000
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  • 6
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    Determination of Meteorite Porosity Using Liquid Nitrogen (2005)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: We introduce a new harmless method for porosity measurement suitable for meteorite samples. The method is a modification of the traditional Archimedean method based on immersion of the samples in a liquid medium like water or organic liquids. In our case we used liquid nitrogen for its chemically inert characteristics.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXVI, Part 11; LPI-Contrib-1234-Pt-11
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  • 7
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    Antipodal Magnetic Anomalies on the Moon, Contributions from Impact Induced Currents Due to Positive Holes and Flexoelectric Phenomina and Dynamo (2005)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Large impacts on the Moon generate large pressure pulses that penetrate the whole body. Several of these large impacts may have generated antipodal structure with anomalous magnetic intensity.These regions can be more than a thousand km across, with fields of the order of tens to hundreds of nT. This is the case of Orientale, Imbrium, Serenitatis, Crisium, and Nectaris impact basins. The production of large-scale magnetic fields and associated crustal magnetization due to lunar basin-forming impacts was hypothesized to have an origin in fields external to the impact plasma cloud that are produced by the magnetohydrodynamic interaction of the cloud with ambient magnetic fields and plasmas. During the period of compressed antipodal field amplification, seismic compressional waves from the impact converge at the antipode resulting in transient shock pressures that reach 2 GPa (20 kbar). This can produce conditions for shock magnetic acquisition of the crust antipodal to impact basins.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXVI, Part 11; LPI-Contrib-1234-Pt-11
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  • 8
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    Magnetic Effects on Bjurbole (L4) Chondrules Moving from Space to Terrestrial Environments (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Meteorites contain magnetic material capable of acquiring a wide range of magnetic remanence records by warming from space temperature and magnetic conditions to 300 K inside the terrestrial environment. Additional information is contained in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXII; LPI-Contrib-1080
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  • 9
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    Impact processes and lunar magnetism (1974)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Progress reports are presented of work related to the magnetic characterization of lunar samples, taking into account total iron ratios, questions of hysteresis classification, aspects of normalized remanence to remanent coercivity plots, and a comparison of NRM of lunar samples with hysteresis characterization. Shock experiments on lunar soil are also considered, giving attention to the effect of shock on the magnetic characteristics of lunar soil and the acquisition of remanence during shock. Preliminary measurements of individual soil particles and of samples from the Lunar Crater are discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 18, 1974 - Mar 22, 1974; Houston, TX
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  • 10
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    Magnetic effects of shock and their implications for magnetism of lunar samples (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The principal problem in lunar magnetism is to account for the surprisingly large magnitude of the remanent magnetism of lunar surface material. Experiments conducted in this connection have shown that shock is an important mechanism of both magnetization and demagnetization. A description is presented of new experimental results in the low-shock range. An attempt is made to assess the effect of shock upon estimates of the ancient lunar field intensity. The results are used as a basis for a reconsideration of the present lunar field models in the light of intensity estimates and other new results. It is found that the central questions in lunar magnetism have not yet been answered to everyone's satisfaction.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
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