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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 303 (1983), S. 50-53 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Two SED source locations have been proposed1 based on the repetition period: the atmosphere at equatorial latitudes where ground-based Doppler measurements6 and Voyager imaging measurements7'8 showed cloud-top wind velocities corresponding to a 10 h 10 min rotation period, and a discrete source in ...
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 322 (1986), S. 42-43 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Voyager 2 radioastronomy data provide only an indirect determination of the rotation period, because we must make the commonly accepted assumption that the periodic nature of the emission is closely related to the intrinsic rotation of the planet. In order to minimize possible measurement bias ...
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 312 (1984), S. 136-138 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The essential features of previous theoretical models of Saturn's ionosphere are summarized below. The major topside ion, H"1", is produced via photoionization of atomic H or photo-dissociative ionization of H2. Both H and H"1" are extremely long-lived above the homopause ( 1,100km altitude; all ...
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  • 4
    Publication Date: 2018-06-11
    Description: The Mars Global Surveyor spacecraft has completed two Mars years in nearly circular polar orbit at a nominal altitude of 400 km. The Mars crust is at least an order of magnitude more intensely magnetized than that of the Earth [1], and intriguing in both its global distribution and geometric properties [2,3]. Measurements of the vector magnetic field have been used to map the magnetic field of crustal origin to high accuracy [4]. We present here a new map of the magnetic field with an order of magnitude increased sensitivity to crustal magnetization. The map is assembled from 〉 2 full years of MGS night-side observations, and uses along-track filtering to greatly reduce noise due to external field variations.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXV: Mars Geophysics; LPI-Contrib-1197
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  • 5
    Publication Date: 2018-06-11
    Description: One of the great surprises of the Mars Global Surveyor (MGS) mission was the discovery of intensely magnetized crust. These magnetic sources are at least ten times stronger than their terrestrial counterparts, probably requiring large volumes of coherently magnetized material, very strong remanence, or both. Perhaps the most intriguing aspect of these fields is their large scale coherence and organization into east-west stripes thousands of kilometers long. The anomalies were almost certainly created by thermoremanent magnetization (TRM) in the presence of a strong Martian dynamo. With few exceptions, the crustal fields are associated with the oldest terrain on Mars. Much of the northern lowlands appears to be non-magnetic, except for the relatively weak north polar anomalies and a few sources adja-cent to the dichotomy boundary, which appear to be associated with strongly magnetized crust south of the boundary. There is clear evidence for impact demagnetization of the Hellas, Argyre, and Isidis basins. Thus, Mars' crustal magnetic fields are among the oldest preserved geologic features on the planet.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXV: Mars Geophysics; LPI-Contrib-1197
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 298 (1982), S. 44-46 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The first in situ observations of the magnetic field of Saturn were obtained by the Pioneer 11 spacecraft in September 1979 2'3. Charged particle and magnetic field data both revealed a near perfect alignment of Saturn's magnetic dipole and rotational axes. Subsequent spherical harmonic analyses of ...
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 292 (1981), S. 721-724 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE close flyby of Saturn at 3.07 Rs (1 Rs = 60,330 km) by Voyager 1 in November 1980 provided a second opportunity to study in situ the intrinsic planetary magnetic field. The first detection of the Saturnian field was accomplished by experiments aboard Pioneer 11 during its close flyby of Saturn ...
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 292 (1981), S. 724-726 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN November 1980, Voyager 1 became the second spacecraft to obtain in situ observations of the magnetosphere of Saturn: little more than a year earlier, the Pioneer 11 spacecraft returned the first evidence of Saturn's magnetosphere. Analyses of the Pioneer 11 magnetic field observations1'2 ...
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 292 (1981), S. 753-755 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SATURN'S magnetic tail was first observed by Voyager 1 as it tranversed the saturnian magnetosphere outbound at 03.40 LT. The observed magnetic field directions clearly indicated the sweeping back of field lines into a tail configuration pointing away from the Sun1 and led us to conclude that ...
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 297 (1982), S. 313-315 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A gradual decrease in the Earth's dipole moment at a rate of -5% per lOOyr has been established from observations of the geomagnetic field over the past 150 yr (ref. 3). Less well established but still generally accepted is the slow westward drift of certain features of the geomagnetic field at a ...
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