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  • Solar Physics  (3)
  • Geophysics  (1)
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  • 1
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    Pseudobreakups During January 10, 1997 (1998)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: The January 10, 1997 interplanetary pressure pulse (observed at 0053 UT at Wind) caused a dayside aurora, as seen in Polar Ultraviolet Imager (UVI) data, that propagates tailward and to lower L.
    Keywords: Solar Physics
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    NASA TECHNICAL REPORTS
  • 2
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    The global heliosphere: A parametric study (1995)
    In:  Other Sources
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    Publication Date: 2019-07-17
    Description: As the Pioneer 10 and 11 and Voyager 1 and 2 spacecraft continue their penetration into the outer heliosphere, more attention has been focused on the nature of the solar wind interaction with the Very Local Interstellar Medium (VLISM). Since the initial pioneering concepts of Davis in 1955 and Parker in the early 1960's both in situ and remote measurements have led to various constraints that do not fit well into a coherent picture. To provide a context for these various observable constraints, we have adapted an explicitly time-dependent, explicitly three-dimensional magnetohydrodynamic (MHD) code to simulate the dependence of the heliospheric configuration and interaction with the VLISM on the properties of the external medium. The code also allows us to study temporal variations brought about by both short- and long-term changes in the solar wind and/or VLISM properties. We will discuss some of the initial results from this new effort and implications for the distances inferred to the termination shock and heliopause boundary. In particular, we will consider the effect of the Very Local Interstellar Magnetic Field (VLIMF) on the configuration and compare it with inferences from observations of outer heliosphere cosmic rays and the Very Low Frequency (VLF) outer heliospheric radio emissions.
    Keywords: Solar Physics
    Type: ; 53
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    NASA TECHNICAL REPORTS
  • 3
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    The Distance to the Heliospheric VLF Emission Region (1995)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: Two major episodes of heliospheric VLF emissions near 3 kHz have been observed by the Voyager spacecraft in 1983-1984 and 1992-1993. This higher-frequency component is apparently triggered by solar wind transients with sufficiently large spatial extents and energies to continue to propagate as shocks in the heliosheath. Entrainment of previously unshocked material and changed flow conditions in the heliosheath both tend to slow the shock propagation. The shock evolution is not self-similar. Rather, it is intermediate to two blast-wave similarity solutions in the moving solar wind frame. In one solution the shock moves as time to the 2/3 power and in the other as time to the 4/5 power. Using these models, the shock/Forbush decrease observed at Voyager 2 in September, 1991 and the turn-on of the 1992 emission is consistent with an emission region distance of approx. 130 AU (assuming no additional slowing of the shock in the heliosheath). If the termination shock was at approx. 70 AU when the transient shock collided with it, the true distance to the source region was probably closer to approx. 115 AU.
    Keywords: Solar Physics
    Type: NASA-CR-204910 , NAS 1.26:204910 , Advances in Space Research (ISSN 0273-1177); 16; 9; 303-306
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  • 4
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    Energization of Ions in near-Earth current sheet disruptions (1995)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: In this study we examine observations made by AMPTE/CCE of energetic ion bursts during seven substorm periods when the satellite was located near the neutral sheet, and CCE observed the disruption cross-tail current in situ. We compare ion observations to analytic calculations of particle acceleration. We find that the acceleration region size, which we assume to be essentially the current disruption region, to be on the order of 1 R(sub E). Events exhibiting weak acceleration had either relatively small acceleration regions (apparently associated with pseudobreakup activity on the ground) or relatively small changes in the local magnetic field (suggesting that the magnitude of the local current disruption region was limited). These results add additional support for the view that the particle bursts observed during turbulent current sheet disruptions are due to inductive acceleration of ions.
    Keywords: Geophysics
    Type: NASA/CR-95-207163 , NAS 1.26:207163 , Paper-94GL03384 , Geophysical Research Letters (ISSN 0094-8534); 22; 5; 627-630
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