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  • ASTROPHYSICS  (6)
  • 1975-1979  (6)
  • 1
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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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    NASA TECHNICAL REPORTS
  • 2
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    Interplanetary discontinuities - Temporal variations and the radial gradient from 1 to 8.5 AU (1979)
    In:  Other Sources
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    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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    NASA TECHNICAL REPORTS
  • 3
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    The radial dependences of the interplanetary magnetic field between 1 and 5 AU Pioneer 10 (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Pioneer 10 vector helium magnetometer data acquired in 1972-1973 during Bartels solar rotations 1896-1918 are used to investigate the radial dependences of the distant interplanetary magnetic field (IMF) between 1 and 5 AU. Least-square fits were determined for the radial dependences of the averages of the magnitudes of IMF components and total field and plane projections, and radial fits were prepared for the standard deviations of these variables over the solar rotation, one day, and three-hour intervals. The variation of the weighted averages of the radial component of the field with respect to the heliocentric distance, the variation of the tangential component of the field, and the characteristics of a subset corresponding to a relatively low average solar wind velocity are reported.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research; 83; Sept. 1
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  • 4
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    Observations of interaction regions and corotating shocks between one and five AU - Pioneers 10 and 11 (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Interaction regions between adjacent solar-wind streams have been identified between 1 and 5 AU by Pioneer 10 and 11 magnetic-field and plasma measurements. Beyond 1 AU, a relatively large fraction of the interaction regions have been found to be accompanied by either forward shocks, reverse shocks, or shock pairs. The observations are consistent with previous theoretical proposals that the interaction between adjacent streams leads to the development of corotating interplanetary shocks.
    Keywords: ASTROPHYSICS
    Type: Geophysical Research Letters; 3; Mar. 197
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  • 5
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    Interplanetary magnetic fields (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The paper reviews the following studies on interplanetary magnetic fields: (1) the relation of the interplanetary field to the sun and to solar-wind streams; (2) radial gradients in the solar wind and interplanetary field; (3) shocks, hydromagnetic waves and discontinuities; (4) variations of interplanetary field parameters over the solar cycle; (5) the relation between the interplanetary field and the terrestrial magnetosphere; (6) the internal dynamics of the magnetic field and solar wind plasma; and (7) the transport, acceleration, and modulation of energetic particles, including cosmic rays. It is noted that further studies will relate to the complex relations between the interplanetary field and solar structure.
    Keywords: ASTROPHYSICS
    Type: Reviews of Geophysics and Space Physics; 17; June 197
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  • 6
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    Observations of the interplanetary sector structure up to heliographic latitudes of 16 deg - Pioneer 11 (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: In the past, observations of the sector structure of the interplanetary magnetic field have been limited to a heliographic latitude of +/- 7.25 deg because spacecraft trajectories have consistently been in or near the ecliptic. The postencounter trajectory of Pioneer 11, which is now en route from Jupiter to Saturn, takes this spacecraft to much higher latitudes than have been previously explored. A study of the sector structure has in this connection been conducted during the ascent of Pioneer 11 to a maximum heliographic latitude of 16 deg. The Pioneer 11 observations demonstrate the presence in interplanetary space of an equatorial current sheet tilted at an angle of about 15 deg to the solar equatorial plane. Thus there is actually only one sector boundary in interplanetary space, not several, as would have been the case if the orientation had been meridional.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research; 83; Feb. 1
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