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  • GEOPHYSICS  (3)
  • 1985-1989  (3)
  • 1975-1979
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  • 1
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    Unknown
    A statistical study of plasma sheet dynamics using ISEE 1 and 2 energetic particle flux data (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Plasma sheet dynamics during substorms are studied by analyzing 461 cases of transient dropout events of the 1.5 and 6-keV particle fluxes detected by ISEE 1 and 2 satellites. The instruments for detecting low- and high-energy particles are described. The spatial distribution of flux dropout events, and the events' relationship to magnetospheric activity level are examined. Substorm events without observed flux dropout events are investigated. The data reveal that the flux dropout distribution is isotropic, between 12-23 earth radii, and is present in the entire nightside plasma sheet; and the substorms without flux dropout are more frequent near earth and magnetospheric flanks. It is observed that tailward of 12 earth radii the flux dropout events and substorms without flux dropout are similar. The Chao et al. (1977) MHD rarefaction wave propagation model and the Hones (1973, 1980) near-tail, X-type magnetic neutral line formation model are discussed and compared to the experimental data. It is noted that neither model explains the plasma sheet dynamics observed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; 6861-687
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A numerical study of suprathermal ionospheric ion trajectories in three-dimensional electric and magnetic field models (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A numerical study of the magnetospheric trajectories of ions upflowing from the ionosphere has been performed using three-dimensional magnetic and electric field models. Ion trajectories have been divided into three main types corresponding to (1) gravitational ions trapped between the magnetic and gravitational mirror points and drifting nearly along the local electric equipotential, (2) ions just escaping from the gravitational field and then convected to the magnetopause due to the loss of the main part of their kinetic energy, and (3) trapped and pseudo-trapped ions whose trajectories are mainly determined by the magnetic field topology (beams and conics) because of their large kinetic energy. Particles from conic distributions injected at inadequate local times and/or altitudes to gain enough energy to precipitate reach the dayside magnetopause after several bounce periods.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 5873-588
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Large scale response of the magnetosphere to a southward turning of the interplanetary magnetic field (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A set of coordinated measurements obtained on March 4, 1979 in the solar wind, in the magnetotail, at geostationary orbit, in the auroral ionosphere, and on the ground has been used to conduct a detailed study of the overall magnetospheric response to a southward turning of the IMF. The change of the IMF direction is found to be associated with a delay of less than about 5 min for increasing eastward and westward electrojets, and precedes by about 10 min the beginning of a taillike deformation of the B field geometry at geostationary orbit near midnight. After the IMF reversal and before the main substorm onset, the general motion of the westward electrojet is southward. At 6.6 R(E) in the nightside, the equatorially trapped high-energy particles adiabatically respond to the local change of the B field by moving earthward. Short-lived substorms occur soon after the IMF reversal.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 2365-237
    Format: text
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    NASA TECHNICAL REPORTS
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