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  • Other Sources  (7)
  • GEOPHYSICS  (7)
  • 1985-1989  (7)
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  • Other Sources  (7)
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  • 1
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    The coalescence of magnetic flux ropes and reconnection in the magnetotail (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 94; 2471-248
    Format: text
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  • 2
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    A magnetohydrodynamic simulation of the formation of magnetic flux tubes at the earth's dayside magnetopause (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Dayside magnetic reconnection was studied by using a three-dimensional global magnetohydrodynamic simulation of the interaction between the solar wind and the magnetosphere. Two different mechanisms were found for the formation of magnetic flux tubes at the dayside magnetopause, which depend on the orientation of the interplanetary magnetic field (IMF). The dayside magnetic flux tubes occur only when the IMF has a southward component. A strongly twisted and localized magnetic flux tube similar to magnetic flux ropes appears at the subsolar magnetopause when the IMF has a large B(y) component. When the B(y) component is small, twin flux tubes appear at the dayside magnetopause. Both types of magnetic flux tube are consistent with several observational features of flux transfer events and are generated by antiparallel magnetic reconnection.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 16; 155-158
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  • 3
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    Global magnetohydrodynamic simulations of the magnetosphere (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The use of a global MHD simulation to study the magnetospheric configuration is demonstrated by reviewing some of the results obtained with the model of Ogino (1986). The steady-state configuration of the magnetosphere in the absence of an IMF is considered, and it is demonstrated that this configuration is changed when a northward or southward IMF is introduced. It is noted that the magnetosphere is very dynamic, and that, since global MHD simulations are intrinsically time-dependent, they offer the possibility of modeling the time sequence of events in the magnetosphere. Results are presented from a calculation in which a magnetospheric substrom is modeled.
    Keywords: GEOPHYSICS
    Type: IEEE Transactions on Plasma Science (ISSN 0093-3813); 17; 135-149
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  • 4
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    Magnetospheric plasma pressures in the midnight meridian - Observations from 2.5 to 35 R(E) (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Plasma pressure data from the ISEE 2 fast plasma experiment (FPE) are statistically analyzed to determine the plasma sheet pressure versus distance in the midnight local time sector of the near-earth (12-35 earth radii) magnetotail plasma sheet. In regions where the bulk of the plasma pressure is contributed by particles in the energy range of the FPE (70 eV to 40 keV for ions), the statistically determined peak plasma pressures vary with distance similarly to previously determined lobe magnetic pressures. Estimates of plasma pressures in the 'transition' region (7-12 earth radii), where the magnetic field topology changes rapidly from a dipolar to a taillike configuration, are compared with the observed pressure profiles. Quiet time observations and estimates are combined to provide profiles of the equatorial plasma pressure along the midnight meridian between 2.5 and 35 earth radii.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 94; 5264-527
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  • 5
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    Field-aligned currents and magnetospheric convection - A comparison between MHD simulations and observations (1988)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A time-dependent three-dimensional MHD model was used to investigate the magnetospheric configuration as a function of the interplanetary magnetic field direction when it was in the y-z plane in geocentric solar magnetospheric coordinates. The model results show large global convection cells, tail lobe cells, high-latitude polarcap cells, and low latitude cells. The field-aligned currents generated in the model magnetosphere and the model convection system are compared with observations from low-altitude polar orbiting satellites.
    Keywords: GEOPHYSICS
    Type: Huntsville Workshop on Magnetosphere/Ionosphere Plasma Models; Oct 14, 1987 - Oct 16, 1987; Guntersville, AL; United States
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  • 6
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    The effects of dipole tilt on magnetotail structure and dynamics (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: A three-dimensional time-dependent global magnetohydrodynamic (MHD) model of the interaction between the solar wind and the earth's magnetosphere has been used to study the effects of dipole tilt on the structure and dynamics of the magnetotail. The location of the tail neutral sheet shifts in the north-south direction following changes in the dipole tilt. When the northern edge of the geomagnetic dipole is tilted toward the sun (positive tilt), it is above the geocentric solar magnetosphere (GSM) equator, while for negative tilt, it is below. The neutral sheet forms an arc across the tail in the y-z plane for nonzero tilt. For positive tilt, the neutral sheet rises above the GSM equatorial plane near the noon-midnight meridian and returns to the equator near the magnetopause. The position and shape of the neutral sheet result from the requirement that the earthward magnetic flux equals the tailward flux and can be well explained by a simple analytical model.
    Keywords: GEOPHYSICS
    Type: Nagoya University, Research Institute of Atmospherics, Proceedings (ISSN 0077-264X); 36; 29-52
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  • 7
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    A computer model of the earth's magnetosphere (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The interaction of the solar wind with the earth magnetosphere is investigated theoretically by means of three-dimensional MHD simulations, with a focus on the effects of changes in the Bz component of the IMF. A high-resolution (0.5 earth radii) version of the model of Ogino et al. (1986) is employed, and the results are presented in a series of computer-generated maps and diagrams and characterized in detail. Bz of -5 nT is found to be associated with dipolar magnetic-field lines near the earth and very concave lines in the magnetotail, while Bz of +5 nT produces a narrow finger of closed field lines extending into the polar cap. Both IMF orientations have sunward convection near the noon-midnight meridian and region-1-type field-aligned currents on both sides of the plasma-sheet extension.
    Keywords: GEOPHYSICS
    Type: Nagoya University, Research Institute of Atmospherics, Proceedings (ISSN 0077-264X); 35; 1-23
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