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  • 1995-1999  (6)
  • 1
    Online Resource
    Online Resource
    Intermittent short-duration magnetic field anomalies in the Io torus: Evidence for plasma interchange?
    American Geophysical Union (AGU) ; 1997
    In:  Geophysical Research Letters Vol. 24, No. 17 ( 1997-09-01), p. 2127-2130
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 24, No. 17 ( 1997-09-01), p. 2127-2130
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/97GL02202
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1997
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    detail.hit.zdb_id: 7403-2
    SSG: 16,13
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Magnetospheric convection in the presence of interplanetary magnetic field B y : A conceptual model and simulations
    American Geophysical Union (AGU) ; 1996
    In:  Journal of Geophysical Research: Space Physics Vol. 101, No. A3 ( 1996-03), p. 4907-4916
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 101, No. A3 ( 1996-03), p. 4907-4916
    Abstract: Existing observations from ISEE 3 and new observations from Galileo show that when the interplanetary magnetic field (IMF) has a B y component, a B y component also develops in the Earth's magnetotail, but only in those quadrants in which the addition of the newly opened magnetic flux tubes occurs. The presence of B y on the closed field lines (which is in the same direction as the IMF B y ) is also seen. We suggest that for a positive IMF B y , the magnetopause is open only in the north dawn and south dusk quadrants of the magnetotail. The continuity of magnetic field across the open boundary then requires that a B y component be present in the magnetosphere in these quadrants but not in the other two quadrants. We present a model of the magnetospheric convection that postulates cross‐tail flows in the mantle/lobe system and the plasma sheet. We suggest that shear flows between the northern and the southern halves of the plasma sheet generate a B component on the closed magnetic field lines. The model is consistent with the two‐cell ionospheric convection models constructed from electric field observations by Heppner and Maynard [1987]. Results from global MHD simulations confirm the main features of the proposed model.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/95JA03673
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1996
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    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Euler potential models of Jupiter's magnetospheric field
    American Geophysical Union (AGU) ; 1997
    In:  Journal of Geophysical Research: Space Physics Vol. 102, No. A6 ( 1997-06), p. 11295-11306
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 102, No. A6 ( 1997-06), p. 11295-11306
    Abstract: We present a new model of the Jovian magnetospheric field which couples the internal field spherical harmonic coefficients from the Goddard Space Flight Center O 6 model with an Euler potential formulation of the external field. The effects of the hinging and the delay of the Jovian current sheet and the sweep‐back of the field lines resulting from the subcorotation of plasma in the magnetosphere are incorporated self‐consistently into the Euler potential equations. Because Jovian magnetosphere undergoes substantial temporal changes in its configuration, it was found necessary to obtain different fit parameters for each of the outbound passes of Pioneer 10, Voyager 1, and Voyager 2. A detailed comparison of the model with the observations obtained in the nightside Jovian magnetosphere reveals that the Euler potential approach can be used successfully to represent the field of external origin in the Jovian magnetosphere. The proposed models are applicable to the inner magnetosphere at all local times and to the middle and the outer magnetosphere on the nightside. The models should provide reliable magnetic field predicts along the trajectory of Galileo in all 11 of the initially planned orbits. We also discuss further extensions of the model which would extend their applicability to all local times and radial distances.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/97JA00563
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1997
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    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
    Location Call Number Limitation Availability
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Models of flux ropes embedded in a harris neutral sheet: Force‐free solutions in low and high beta plasmas
    American Geophysical Union (AGU) ; 1995
    In:  Journal of Geophysical Research: Space Physics Vol. 100, No. A12 ( 1995-12), p. 23637-23645
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 100, No. A12 ( 1995-12), p. 23637-23645
    Abstract: We present two models of an array of flux ropes embedded in a Harris neutral sheet. The first solution satisfies the two‐dimensional Vlasov‐Maxwell equilibrium and is electromagnetically force free. Such a solution is pertinent to a plasma in which β, the ratio of the thermal pressure to the magnetic pressure, is small. Several features of the model are in excellent agreement with observations of flux ropes in the magnetotail of the Earth. The maximum magnitude of the core field can be larger than the magnitude of the lobe field, B L ; the scale length of the individual flux ropes equals the scale length of the current reversal region in the Harris neutral sheet; and the maximum value of the north‐south component is less than B L . Magnetotail flux ropes are thought to be isolated structures. Our solution, although periodic in the down‐tail direction, is interesting as it provides a consistent description not only of the flux ropes but also of the fields in which they are embedded, a feature that is lacking in other models. We use data from the December 1990 Galileo flyby of Earth and find that the unit cells of the periodic solution are unsatisfactory for the β≈1 conditions of the tail plasma sheet. We then develop a closely related solution valid in the high β regime that incorporates particle pressure self‐consistently and find that the unit cells of this solution provide an excellent fit to the Galileo flux rope observations.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/95JA01548
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1995
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    detail.hit.zdb_id: 3094104-0
    detail.hit.zdb_id: 2130824-X
    detail.hit.zdb_id: 2016813-5
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    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
    Location Call Number Limitation Availability
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    Online Resource
  • 5
    Online Resource
    Online Resource
    MHD simulations of Io's interaction with the plasma torus
    American Geophysical Union (AGU) ; 1998
    In:  Journal of Geophysical Research: Planets Vol. 103, No. E9 ( 1998-08-30), p. 19867-19877
    Details
    In: Journal of Geophysical Research: Planets, American Geophysical Union (AGU), Vol. 103, No. E9 ( 1998-08-30), p. 19867-19877
    Abstract: We compare results from magnetohydrodynamic computations of Io's interaction with the plasma torus with observations from the Galileo flyby. Both conducting and intrinsically magnetized models of Io are considered. Both models can reproduce many observed features of the interaction, including a high plasma density, a low plasma temperature, and a significant depression in magnetic field magnitude in Io's wake. The high plasma density in the wake is produced by ion pickup and concomitant slowing of the flow and is not of ionospheric origin. The models also show important quantitative differences with the data. In particular, neither model reproduces large‐scale structure on the flanks of the geometric wake. Neither model can be ruled out at the present time, but intrinsically magnetized models most easily match the magnitude of the maximum observed magnetic field depression in the wake. Comparison of results with future Galileo flybys past Io (planned for 1999) may help to clarify whether Io is magnetized.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/98JE00632
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1998
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    detail.hit.zdb_id: 3094104-0
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    detail.hit.zdb_id: 2016813-5
    detail.hit.zdb_id: 2016810-X
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    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    Interaction of Io with its torus: Does Io have an internal magnetic field?
    American Geophysical Union (AGU) ; 1997
    In:  Geophysical Research Letters Vol. 24, No. 19 ( 1997-10-01), p. 2391-2394
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 24, No. 19 ( 1997-10-01), p. 2391-2394
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/97GL02507
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1997
    detail.hit.zdb_id: 2021599-X
    detail.hit.zdb_id: 7403-2
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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