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  • 1
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    The shape and location of the sector boundary surface in the inner solar system (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Simultaneous observations by Helios 1 and Helios 2 over four solar rotations, between January 20 and May 23, 1976, were used to determine the latitudinal dependence of the polarity of the interplanetary magnetic field within plus or minus 7.23 deg of the solar equator and within 1 AU. The longitudinal and latitudinal positions of the sector boundary crossing are consistent with a warped sector boundary which extended from the sun to 1 AU and was inclined approximately 10 deg with respect to the heliographic equator. This is consistent with simultaneous Pioneer 11 observations, which showed unipolar fields at approximately 16 deg latitude at heliocentric distances greater than 3.5 AU. Two sectors were observed at southern latitudes; however, four sectors were observed at northern latitudes on two rotations, indicating a distortion from planarity of the sector boundary surface.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research; 84; Nov. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    An extended investigation of Helios 1 and 2 observations - The interplanetary magnetic field between 0.3 and 1 AU (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Helios 1 and 2 spacecraft allowed a detailed investigation of the radial dependence of the interplanetary magnetic field components between 0.3 and 1 AU. The behavior of the radial component is in a very good agreement with Parker's model (approximately equal to the inverse square of the heliocentric distance) and the azimuthal component also shows a radial dependence which is close to theoretical predictions (approximately equal to the inverse of the heliocentric distance). Experimental results for the normal component and for the field magnitude are consistent with those from previous investigations. The relative amplitude of the directional fluctuations with periods less than 12 hr is essentially independent of heliocentric distance, while their power decreases approximately as the inverse cube of the heliocentric distance without any appreciable difference between higher and lower velocity regimes.
    Keywords: ASTROPHYSICS
    Type: Solar Physics; 63; Sept
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    NASA TECHNICAL REPORTS
  • 3
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    Structure of current sheets in the sector boundaries - Helios 2 observations during early 1976 (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The orientation and structure of 14 current sheets are examined. Most of the observed sheets can be interpreted as tangential discontinuities that are, on the average, inclined at large angles with respect to the ecliptic plane, and have a typical thickness ranging from 1000 to 6000 km. Results do not show any evidence for a variation of the physical characteristics of the boundaries with time or heliocentric distances. The implications of a comparison between present results and the global configuration of the sector boundary surface are discussed, and it is concluded that the multiplicity of events within individual transition regions may suggest fluctuations of the sector boundary surface on the fine scale.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research; 87; Feb. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The shape and location of the sector boundary surface in the inner solar system (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Simultaneous observations by Helios-1 and Helios-2 over four solar rotations were used to determine the latitudinal dependence of the polarity of the interplanetary magnetic field within plus or minus 7.23 deg of the solar equator and within 1 AU. The longitudinal and latitudinal positions of the sector boundary crossing are consistent with a warped sector boundary which extended from the sun to 1 AU and was inclined approximately 10 deg with respect to the heliographic equator. This is consistent with simultaneous Pioneer 11 observations, which showed unipolar fields at latitude approximately 16 deg at heliocentric distances greater than 3.5 AU. Two sectors were observed at southern latitudes; however, four sectors were observed at northern latitudes on two rotations, indicating a distortion from planarity of the sectory boundary surface.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-80326
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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