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  • 1
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    Magnetic holes in the solar wind (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: An analysis of high-resolution magnetic field measurements from the Goddard Space Flight Center magnetometer on Explorer 43 showed that low magnetic field intensities (less than 1 gamma) in the solar wind at 1 AU occur as distinct depressions, or 'holes', in otherwise nearly average conditions. These magnetic holes are new kinetic scale phenomena, having a characteristic dimension of the order of 20,000 km. They occurred at a rate of 1.5/d in the 18-day interval (March 18 to April 6, 1971) that was considered. Most magnetic holes are characterized by both a depression in /B/ and a change in the magnetic field direction, and some of these are possibly the result of magnetic merging. However, in other cases the direction, does not change; such holes are not due to merging but might be a diamagnetic effect due to localized plasma inhomogeneities.
    Keywords: SOLAR PHYSICS
    Type: Journal of Geophysical Research; 82; May 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Microscale 'Alfven waves' in the solar wind at 1 AU (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Data obtained by IMP 1 about interplanetary plasma and magnetic-field fluctuations on a scale of one hour are analyzed. It is found that linearly and circularly polarized Alfven waves were rarely present. Fluctuations having most of the characteristics of large-amplitude 'Alfven waves' and which were observed to be moving away from the sun nearly along the magnetic-field direction are shown not to have been pure transverse Alfven waves since they were accompanied by nonzero fluctuations in the magnetic-field intensity. It is suggested that the fluctuations may have been nonlinear elliptically polarized Alfven waves coupled to the fast mode and moving through a magnetic field that is nonuniform on a scale not exceeding about 0.01 AU.
    Keywords: SOLAR PHYSICS
    Type: Journal of Geophysical Research; 81; Jan. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Magnetic holes in the solar wind (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An analysis is presented of high resolution interplanetary magnetic field measurements from the magnetometer on Explorer 43 which showed that low magnetic field intensities in the solar wind at 1 AU occur as distinct depressions or 'holes'. These magnetic holes are new kinetic-scale phenomena, having a characteristic dimension on the order of 20,000 km. They occurred at a rate of 1.5/day in the 18-day time span (March 18 to April 6, 1971) that was analyzed. Most of the magnetic holes are characterized by both a depression in the absolute value of the magnetic field, and a change in the magnetic field direction; some of these are possibly the result of magnetic merging. However, in other cases the magnetic field direction does not change; such holes are not due to magnetic merging, but might be a diamagnetic effect due to localized plasma inhomogeneities.
    Keywords: SOLAR PHYSICS
    Type: NASA-TM-X-71109 , X-692-76-90
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Directional discontinuities from Mariner 5 and solar wind structure (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Directional discontinuities from Mariner 5 are studied. A substantial majority of the events have properties which are consistent with their being identified as tangential discontinuties. The results presented here agree in several respects with those of Burlaga from Pioneer 6. In addition, new results are presented. Previous Mariner 5 work on this subject is summarized with an explanation of apparent inconsistencies.
    Keywords: SOLAR PHYSICS
    Type: NASA-TM-X-70733 , X-693-74-234
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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