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  • Other Sources  (36)
  • 1975-1979  (36)
  • 1
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    The ISEE-C plasma wave investigation (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The ISEE-C plasma wave investigation is designed to provide comprehensive information on interplanetary wave-particle interactions. Three spectrum analyzers with a total of 19 bandpass channels cover the frequency range 0.3 Hz to 100 kHz. The main analyzer, which uses 16 continuously active amplifiers, gives two complete spectral scans per second in each of 16 filter channels. The instrument sensors include a high-sensitivity magnetic search coil, and electric antennas with effective lengths of 0.6 and 45 m.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: IEEE Transactions on Geoscience Electronics; GE-16; July 197
    Format: text
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  • 2
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    The ISEE-1 and ISEE-2 plasma wave investigation (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The ISEE-1 and ISEE-2 plasma wave experiments are designed to provide basic information on wave-particle interactions in the earth's magnetosphere and in the solar wind. The ISEE-1 plasma wave instrument uses three electric dipole antennas with lengths of 215, 73.5 and 0.61 m for electric field measurements, and a triaxial search coil antenna for magnetic field measurements. The ISEE-2 instrument uses two electric dipole antennas with lengths of 30 and 0.61 m for electric field measurements and a single-axis search coil antenna for magnetic field measurements. The primary scientific objectives of the experiments are described, including the resolution of space-time relationships of plasma wave phenomena and VLBI studies. The instrumentation is described, with emphasis on the antennas and the electronics.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: IEEE Transactions on Geoscience Electronics; GE-16; July 197
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  • 3
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    Mars in the solar wind (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Recent spacecraft observations and model calculations of the solar wind interaction (SWI) at Mars have shown that the particle pressure is not large enough to stand off the solar wind unless the electron temperature is 4 times the ion temperature in the ionosphere, but the additional pressure is presumably magnetic, provided by a planetary magnetic field. In addition, a planetary field corresponding to a surface field of about 20 gammas, and a dipole moment of about 8 x 10 to the 21st gauss per cu cm are implied. Calculations indicate that 60-70% of the pressure is supplied by the magnetic field, and 30-40% by the ionosphere. Thus, the SWI at Mars is unique, being an interaction both with the atmosphere and with the planetary magnetic field.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 84; Dec. 30
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  • 4
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    Acceleration of energetic protons by interplanetary shocks (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The University of Iowa instrument aboard Pioneer 11 detected 69 energetic proton events (EPE) (in the 0.6-3.4 MeV energy range) during 1973-1974 in the heliocentric radial range 1-5 AU. Sixty percent of the EPE peak within plus or minus 5 hours of a corotating interaction region (CIR) boundary, while 19% peak inside and 21% peak outside the interaction regions. Of the CIR boundaries at which an EPE peaks with plus or minus 5 hours, 80% have associated shocks. The observed intensities and pitch angle distributions of protons near shock fronts are consistent with a theoretical simulation of the acceleration of protons by a drift in the electric field at the shock front.
    Keywords: SPACE RADIATION
    Type: Journal of Geophysical Research; 84; Dec. 1
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  • 5
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    Plasma wave turbulence at the magnetopause - Observations from ISEE 1 and 2 (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: An investigation of plasma wave electric and magnetic fields in the vicinity of the magnetopause using measurements from the ISEE 1 and 2 spacecraft is presented. Strong electric and magnetic field turbulence is often observed at the magnetopause; the electric field spectrum of this turbulence extends from less than a few hertz to over 100 kHz, and the magnetic field from a few hertz to about 1 kHz. Similar turbulence spectra are observed in association with flux transfer events and possible 'inclusions' of boundary layer plasma in the magnetosphere. Two possible plasma instabilities, the electrostatic ion-cyclotron and the lower-hybrid-drift instability, should explain the broad-band electric field turbulence; the narrow-band electrostatic emissions near the local electron plasma frequency are believed to be plasma oscillations or electrostatic waves near the upper-hybrid-resonance frequency.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 84; Dec. 1
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  • 6
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    Jupiter's magnetopause (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Some of the major conclusions regarding the magnetopause of Jupiter, based on Pioneer and Voyager observations, are discussed. Topics include the overall shape of the magnetosphere, the variability in the location of the magnetopause with changes in the solar wind, intrinsic magnetospheric motions, the character of the field and plasma just inside the magnetopause and evidence of magnetic merging.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: ESA Magnetospheric Boundary Layers; p 221-224
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  • 7
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    Fields and plasmas in the outer solar system (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The most significant data on fields and plasmas in the outer solar system, based on observations by Pioneer 10 and 11, are reviewed. Attention is given to (1) corotating shocks and the evolution of high speed solar wind streams, (2) the effect of the changing structure of the interplanetary medium on energetic particles, (3) the propagation of flare-generated shocks through the outer solar system, (4) radial gradients in the solar wind and interplanetary field, and (5) the dependence of the interplanetary sector structure on heliographic latitude.
    Keywords: ASTROPHYSICS
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  • 8
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    Initial results from the ISEE-1 and -2 plasma wave investigation (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A survey of initial results from the plasma-wave investigation on the ISEE 1 and 2 spacecraft is presented. The plasma-wave instruments employed are designed to provide measurements of the electric and magnetic fields of plasma waves over the frequency range from about 5 Hz to 300 kHz. Several representative satellite passes are analyzed in detail and discussed. The results considered are shown to demonstrate the very high-quality data being obtained with the instruments and to illustrate the wide range of magnetospheric plasma-physics problems that can be treated with the ISEE spacecraft. Comparisons of plasma-wave spectra between the two spacecraft are performed which indicate the great advantages of using two spacecraft in similar orbits to unravel the complex spatial and temporal variations that occur in the magnetosphere.
    Keywords: GEOPHYSICS
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  • 9
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    The magnetic field of Jupiter - A comparison of radio astronomy and spacecraft observations (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The inner magnetic field of Jupiter is characterized on the basis of Pioneer 10 and 11 measurements and earth-based decimetric radio observations. The dipole parameters derived from the two data sets are in good agreement. Problems in reconciling asymmetries observed in the earth-based data and the spacecraft data are discussed. Models of synchrotron emission from arbitrary magnetic field configurations and high-resolution maps of the Jovian radiation belts in all polarizations are needed to further understanding of Jupiter's magnetic field
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 10
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    Interplanetary discontinuities - Temporal variations and the radial gradient from 1 to 8.5 AU (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A dependence of the rate of occurrence and properties of interplanetary discontinuities on radial distance were investigated using Pioneer 10 and 11 vector helium magnetometer observations. Spatial and temporal variations were separated and discontinuities identified, noting that their rate of occurrence undergoes large variations well outside the deviations expected from statistical fluctuations. Temporal changes in the occurrence rate averaged over Bartels solar rotations were well correlated at Pioneer 10 and 11, separated by a distance of 2 AU, and time variations consisted of slow modulation of the occurrence rate due to changing solar conditions. The correlation over widely separated distances is interpreted by a model in which the discontinuities originate inside 1 AU and are convected outward by the solar wind. Evidence of spatial dependence was provided by a decrease in the rates of occurrence at both spacecraft with increasing radial distance, and it was shown that the Pioneer 11 rate, nearer the sun, exceeded the Pioneer 10 rate at greater distances.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research; 84; June 1
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