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  • 1
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    A search for auroral type motions in solar flares (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Because of analogies between auroras and solar flares, and because of well-established motion along auroras (the so-called westward travelling surge), one might expect systematic motion of brightness to occur along flare ribbons. The Sacramento Peak Observatory flare records of 37 double-ribbon solar flares observed from 1968 to 1972 were examined for evidence of such systematic motion, but results of the investigation were negative.
    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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    Solar Terrestrial programs: A five year plan (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Major projects to be initiated in the 1980-1985 period, designed to study the Sun, the heliosphere, Earth's magnetosphere, and the upper atmosphere involve the use of spacelab as well as free flying spacecraft. Current and recent investigations in these areas are reviewed and the guiding principles followed in planning future missions are examined. The implementation strategy, the planning process, and supporting research and technology are discussed.
    Keywords: SOLAR PHYSICS
    Type: NASA-TM-82351
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The role of O-type neutral lines in magnetic merging during substorms and solar flares (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An analytical model of O-type configurations was derived, for visualizing the geometry and for numerical treatment of plasma flows. It was found that at a certain distance from the neutral line the mean particle motion became decoupled from that of magnetic field lines (which obey the MHD condition). The decoupling distance depended on initial conditions in momentum space, suggesting that the MHD approximation which averages out such conditions may not suffice for describing plasma dynamics near the neutral line. It was also found that after inflowing particles are decoupled from the field line motion, they go over to a mode of runaway acceleration along the neutral line. It is concluded that if merging occurs at an X-O pair, two particle populations may be expected - low energy particles accelerated adiabatically by earthward convection past the X-type line and high-energy particles convected towards the O-type line. The second acceleration process depends critically on the rapidity of merging and is therefore expected to vary considerably from event to event.
    Keywords: SOLAR PHYSICS
    Type: NASA-TM-78093
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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