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  • ASTROPHYSICS  (3)
  • 1975-1979  (3)
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  • 1
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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
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Can X-ray bursts be caused by substorms at a neutron star (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A model for X-ray bursts from accreting neutron stars is developed by analogy with geomagnetic substorms. The essential steps in the substorm process are the nearly steady merging or reconnection of the magnetic field in the magnetosphere with the field in the stellar wind, the transport of some of the merged plasma into a magnetically controlled tail, and the explosive release of plasma from the tail into the magnetosphere. The strength of the magnetic field in the stellar wind required to drive a substorm is approximately 0.1 gauss. If the stellar wind is organized into large-scale magnetic sectors, as is the solar wind, topological dissipation will not occur, and the large-scale field will be available for merging at the magnetopause. Once the material is in the tail, the time scales for the Kruskal-Schwarzschild instability and the unidentified instability which drives terrestrial substorms may be comparable. Alternating periods of burst activity and quiescence could be caused by passage from one sector to another with opposite polarity, or be seasonal variations.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 226
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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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
    Format: text
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    NASA TECHNICAL REPORTS
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