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  • 1
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    A study of the Rima Sirsalis lunar magnetic anomaly (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The source of the lunar magnetic anomaly associated with the Rima Sirsalis linear rille has been modelled using the vector field intensities due to arbitrary uniform magnetization in a rectangular prism. It is shown that in order to match the Apollo 16 subsatellite data, the lunar surface near the rille must have a vertical magnetization of 6,000-9,000 G if the anomaly is due to flux leakage from a gap in the crust with the dimensions of the rille. An alternative explanation is that Rima Sirsalis and its surroundings are the site of a vertical magnetization contrast of 100,000-10,000 G which is at least as wide as the rille and extends to a depth of tens of kilometers in the crust. A wider magnetic source reduces the required magnetization (or depth) proportionately, since to first order the field at high altitude is proportional to the magnetic dipole moment per unit length.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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    NASA TECHNICAL REPORTS
  • 2
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    Lunar remnant magnetic field mapping from orbital observations of mirrored electrons (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A technique is described for mapping areas of lunar surface magnetism by observing ambient low-energy electrons from lunar orbit with a detector that is sectored to distinguish directions of arrival with respect to the ambient magnetic field and the lunar surface. It is noted that the ambient electrons provide a probe along the ambient magnetic-field lines down to the lunar surface for remote sensing of the presence of surface fields. Unlike direct magnetometer measurements, this probe does not require low altitude or a very stable ambient field in order to map the occurrence regions of such fields. Preliminary maps generated for the surface magnetic areas underlying the orbit of the Particles and Fields Satellite deployed from Apollo 16 are presented to demonstrate the feasibility of this technique.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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    NASA TECHNICAL REPORTS
  • 3
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    Evidence for a high altitude distribution of lunar dust (1974)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The crew of Apollo 17 saw streamers accompanying spacecraft sunrise. The time variations of the brightness of these streamers indicate that they were produced by light scattering in the lunar vicinity rather than brightness variations of material streamers emanating from the sun. The angular extent of the streamers indicate that the light scattering particulates extended from the lunar surface to above the orbital altitude of the spacecraft. Although observed as typical sunrise phenomena by Apollos 10 and 17, and possibly by 8 and 15 as well, streamers were not observed during the flight of Apollo 16. The scattering particles seem to be present sporadically, most likely lunar dust of tenth micron scale, and not a result of spacecraft contamination.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 18, 1974 - Mar 22, 1974; Houston, TX
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    NASA TECHNICAL REPORTS
  • 4
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    Lunar surface remanent magnetic fields detected by the electron reflection method (1976)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: We present maps of the lunar surface remanent magnetic fields detected by the electron reflection method. These maps provide substantial coverage of the latitude band from 30 N southward to 30 S with a resolution of about 40 km and a sensitivity of about 0.2 gamma at the lunar surface. Regions of remanent magnetization are observed ranging in size from the resolution limit of 1.25 deg to above approximately 60 deg. The largest contiguous region fills the Big Backside Basin where it is intersected by the spacecraft orbital tracks. Preliminary analyses of the maps show that the source regions of lunar limb compressions correspond to regions of strong surface magnetism, and that there does not appear to be sharply discontinuous magnetization at the edges of maria. We also analyze the electron reflection observations to obtain information on the direction and distribution of magnetization in the Van de Graaff anomaly region.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 15, 1976 - Mar 19, 1976; Houston, TX
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  • 5
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    Photometric studies of light scattering above the lunar terminator from Apollo solar corona photography (1976)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Excess brightness is found in 70-mm photographs of the solar corona above the lunar terminator during Apollo 15 and 17. Maximum brightness of this scattered light is determined from calibration of image density. The observed excess brightness displays circular symmetry above the lunar-horizon subsolar point, characteristic of forward diffraction scattering from micron or submicron size (solid) grains, and decays rapidly in intensity with altitude and distance from the lunar terminator. The observed brightness cannot be accounted for by a co-orbiting cloud of spacecraft contaminants, but requires a variable lunar dust 'atmosphere' over the terminator regions extending to altitudes in excess of 100 km. To maintain such large masses of lunar fines above the terminator requires either local mass-churning rates in excess of 2 by 10 to the -11th power g/sq cm sec or the assumption of some degree of high-altitude electrostatic suspension to increase the dwell time of individual grains at the altitudes observed. Such a model would reduce mass-churning rates while causing selective erosion/deposition and potential for escape of significant mass from the moon
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 15, 1976 - Mar 19, 1976; Houston, TX
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  • 6
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    Mapping of lunar surface remanent magnetic fields by electron scattering (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Calif. Univ. Res. in the Space Sci., Vol. 2, No. 1; 5 p
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  • 7
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    Linear magnetization feature associated with Rima Sirsalis (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Measurements of the magnetic fields by the electron reflection method in the neighborhood of the long structural rille Rima Sirsalis show that a magnetic field with a strength of at least 100 nT (100 gammas) is present over a region of the order of 10 km in width and at least 300 km long. The center of the magnetized region closely parallels and is centered on the rille. The linear magnetization feature extends at least to latitude 8 deg S, 60 km beyond the place where the rille disappears at the edge of Oceanus Procellarum. This extension is coincident with the extrapolation of the rille based on photographs. However, the magnetization is much weaker or entirely absent at 5 deg S and has vanished at 0 deg latitude. These results suggest that the rille is indeed a structural feature and has associated with it magnetization, either in the form of intrusive magnetized rock or of a gap in an otherwise more or less uniformly magnetized layer of rock of large extent in two dimensions. Furthermore, the rille structure evidently is present for some distance beneath the lava flows of the Oceanus Procellarum basin.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters; 34; 1, Fe; Feb. 197
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  • 8
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    Mapping of lunar surface remanent magnetic fields by electron scattering (1975)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The electron scattering technique for measurement of lunar surface remanent magnetic fields is described and a map of the remanent field regions derived from the 14-keV electron measurements of the particle experiment aboard the Apollo 16 Subsatellite is presented. The mapping achieves a spatial resolution of about 40 km and a sensitivity of about 0.1 gamma at the lunar surface.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
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