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  • 1
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    Patterns of magnetic field merging sites on the magnetopause (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Models of the magnetospheric and magnetosheath magnetic fields are used to determine the relative orientations of the two near the dayside magnetopause for the purpose of locating potential merging sites. Areas of the magnetopause with various degrees of antiparallelness for different Interplanetary fields as contour diagrams are studied. For southward and GSE-Y interplanetary field, the patterns obtained are consistent with those envisioned by Crooker in an earlier analysis which used simplified representations for the magnetic field geometry. Here the application of realistic models shows the locations of areas where any antiparallel component occurs. Merging sites for radial interplanetary fields are also illustrated. The results suggest that the geometrical configuration of the fields is suitable for merging over a large fraction of the magnetopause for interplanetary fields that are either primarily southward, GSE-Y, or radial (GSE-X) in direction.
    Keywords: GEOPHYSICS
    Type: Neilsen Eng. and Res., Inc. Appl. of a Global Solar Wind/Planetary Obstacle Interaction Computational Model 10p (SEE N84-26509 16-88)
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  • 2
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    Bursty bulk flows in the inner central plasma sheet: An effective means of earthward transport in the magnetotail (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: High speed flows in the Earth's Inner Central Plasma Sheet (ICPS) occur during enhanced flow intervals that have been termed Bursty Bulk Flow (BBF) events. The importance of different flow magnitude samples for Earthward transport in the ICPS are statistically evaluated and several representative BBF's and their relevance to Earthward transport are discussed. The selection of BBF's is automated in a database and they are shown to be responsible for most of the Earthward transport that occurs within the ICPS. The BBF related transport is compared to the transport measured within the entire plasma sheet during the 1985 AMPTE/IRM crossings of the magnetotail. The results show that BBF's last only a small fraction of the time in the plasma sheet but can account for several tens of percent of the Earthward particle and energy transfer and possibly all of the Earthward magnetic flux transfer in the plasma sheet.
    Keywords: GEOPHYSICS
    Type: ESA, Substorms 1; p 303-308
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  • 3
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    A magnetohydrodynamic simulation of reconnection in the magnetotail during intervals with southward interplanetary magnetic field (1987)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Results are reported from a simulation of the interaction between the solar wind and the earth magnetosphere, using a time-dependent three-dimensional MHD model. The calculation was performed for several orientations of the IMF between dawnward pointing and southward. When the IMF has a dawnward component, the plasma sheet rotates northward on the dawnside of the tail and toward the south on the duskside. As the southward component becomes larger, the plasma sheet becomes thinner and develops a wavy cross section because of patchy or localized tail reconnection. The field-aligned currents (FACs) associated with this localized reconnection have a filamentary layered structure. When projected onto the polar cap the filamentary FACs are located in the same region as the tail region 1 currents. At lower latitudes strong region 2 sense currents that originate in the plasma sheet are found. FACs are found on field lines that map to the polar cap even for southward IMF. These currents have many of the properties of the observed polar-cusp currents. The polar-cusp FACs evolve from the polar-cap NB(z) FACs as the IMF is rotated from northward to southward.
    Keywords: GEOPHYSICS
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  • 4
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    Auroral zone field-aligned currents observed in the magnetotail and at intermediate altitudes - An ISEE perspective (1987)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The relationship between low-altitude auroral-zone field-aligned currents and the geomagnetic tail is investigated on the basis of a statistical analysis of ISEE and DE observations. The data are compiled in diagrams and graphs and characterized in detail. It is shown that the large-scale current systems of low-altitude regions 1 and 2 are only reduplicated in 27 percent of the observations at 2-7 earth radii (those associated with the onset of a substorm expansion), while the flow at the plasma-sheet boundary opposes the region 1 polarity (the highest-latitude near-midnight currents being directed earthward).
    Keywords: GEOPHYSICS
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  • 5
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    A magnetohydrodynamic simulation of the bifurcation of tail lobes during intervals with a northward interplanetary magnetic field (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The interaction of the solar wind with the earth's magnetosphere during a northward interplanetary magnetic field was studied by using a three-dimensional magneto-hydrodynamic model. For a northward interplanetary magnetic field on 5 nT, the plasma sheet thickens near the noon-midnight meridian plane. When projected onto the polar cap this appears as a narrow channel extending from midnight towards noon. This plasma pattern is associated with three pairs of convection cells. The high latitude sunward convection and northern B(z) Birkeland current are caused by magnetic merging in the polar region.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 1018-102
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  • 6
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    Modeling planetary magnetospheres (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Recent advances in the development of models of the macroscopic properties of the terrestrial and planetary magnetospheres are reviewed. Particular attention is given to work on semiempirical models of magnetic and electric fields in the earth's magnetosphere, the modeling of magnetospheric storms and substorms in the inner magnetosphere, and the self-consistent modeling of processes in the magnetotail, including reconnection. Magnetohydrodynamic models of the dayside magnetosphere and the magnetotail which are based on calculations of the interaction of the solar wind with the magnetosphere are also considered. Finally, work on the modeling of the magnetospheres of Mercury, Venus, Jupiter, Saturn and Uranus is presented.
    Keywords: GEOPHYSICS
    Type: AD-A137218 , AFGL-TR-84-0020 , (ISSN 0034-6853)
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  • 7
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    Neutral sheet current interruption and field-aligned current generation by three-dimensional driven reconnection (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Externally-driven reconnection is simulated by solving the magnetohydrodynamic equations in a three-dimensional, tail-like geometry. As reconnection proceeds, the tail current is interrupted locally and field-aligned currents are generated. The field-aligned current flows towards the ionosphere on the morning side and away from the ionosphere in the evening. The field-aligned currents flow in a narrow band at the outer edge of the plasma sheet. Thus, the simulation demonstrates that the nightside substorm current system is a natural consequence of the driven reconnection model.
    Keywords: GEOPHYSICS
    Type: AD-A137238 , AFGL-TR-84-0019 , Geophysical Research Letters; 10; Mar. 198
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  • 8
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    A note on the location of the stagnation point in the magnetosheath flow (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: While observational and theoretical investigations have clearly indicated that the shape of the magnetosphere is very nearly symmetric about the plane determined by the aberrated solar wind flow direction and the earth's magnetic dipole, many processes such as magnetic pulsations and geomagnetic activity which should be shape dependent do not exhibit symmetry about this plane. The present paper proposes a solution to this apparent paradox in terms of the shifting of the stagnation point in the magnetosheath flow. It is shown that the interplanetary magnetic field can act to shift the stagnation point on the order of 15 deg from the nose towards dawn during periods of low Alfven Mach number without an appreciable aberration of the magnetopause, accounting for the observations of pulsation demarcation and magnetic reconnection.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 8; Sept
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  • 9
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    The influence of the interplanetary magnetic field and thermal pressure on the position and shape of the magnetopause (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: An ellipsoidal model, in which the size of an ellipsoid of revolution with a constant eccentricity is inversely proportional to the sixth root of the stream pressure of the solar wind, is used to represent the location of the dayside magnetopause and to study the influences of the interplanetary magnetic field and thermal pressure on its location. The effects of the IMF and thermal pressure on the location of the magnetopause are calculated analytically by using the Chapman-Ferraro theory. The changes in magnetopause size, shape and orientation caused by including the thermal pressure are inversely proportional to the square of the sonic Mach number of the solar wind and are sufficient to explain the observed slight departure of the magnetotail from the expected aberration due to the earth's orbital motion. The results suggest that little angular momentum is being carried away from the sun by the solar wind.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; Nov. 1
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  • 10
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    ISEE 1 and 2 observations of an oscillating outward moving current sheet near midnight (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The ISEE 1 and 2 magnetometers are used to examine a current sheet which is moving outward with a velocity of about 17 km/sec, and whose current is flowing into the ionosphere. A wave is traveling along the current sheet, from midnight toward the east, at 400 km/sec. The plasma oscillations normal to the current sheet associated with this wave are sufficient for explaining the amplitude of the electric field oscillations in the plane of the current sheet observed by the University of California's electric field detector. The present oscillating current sheet model explains both magnetic and electric field observations.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 2745-275
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