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  • ASTROPHYSICS  (6)
  • 1
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    Magnetic fields on the sun and the north-south component of transient variations of the interplanetary magnetic field at 1 AU (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In order to study the relationship between solar magnetic fields and the transient variations of the north-south component B(Z) of the interplanetary magnetic field (IMF) at 1 AU, flares from unusual north-south oriented active regions, large IMF B(Z) events, and large flares with comprehensive flare index higher than 12 were collected. The associated IMF B(Z) changes or the magnetic field of the initiating flares are investigated. For those cases where an association between a transient B(Z) variation and an initiating flare is plausible, it is found that, for a given flare field, the orientation of the corresponding transient variation of B(Z) may be in agreement with the flare field, opposite to it, or more often, fluctuating in both magnitude and direction. Conversely, an IMF B(Z) event may originate in a flare field in the same magnetic orientation, opposite to it, or in the east-west orientation.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 2703-271
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The interaction between a magnetized plasma flow and a magnetized celestial body - A review of magnetospheric studies (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Previous studies of solar-system magnetospheres are reviewed. Attention is given to the internal structure of the magnetospheres of earth and Mercury, the open structure of the terrestrial magnetosphere, aurorae, functions of the terrestrial magnetosphere, the disklike outer structure of Jupiter's magnetosphere, and the plasma processes involved in the development of a magnetospheric potential drop and electric field. The interaction between a turbulent magnetized plasma flow and a magnetosphere is discussed on the basis of studies of the solar-wind interaction with the terrestrial magnetosphere. A 'gathered' or folded magnetic equatorial plane is suggested for the sun, coronal holes are identified as the source region for fast solar-wind streams, and magnetic energy conversion processes of relevance to earth and the sun are considered. Two models of a magnetospheric substorm are examined, and difficulties encountered in understanding substorm processes are summarized.
    Keywords: ASTROPHYSICS
    Type: Space Science Reviews; 21; Mar. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Relationship between the growth of the ring current and the interplanetary quantity (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Akasofu (1979) has reported that the interplanetary parameter epsilon correlates reasonably well with the magnetospheric substorm index AE; in the first approximation, epsilon represents the solar wind coupled to the magnetosphere. The correlation between the interplanetary parameter, the auroral electrojet index and the ring current index is examined for three magnetic storms. It is shown that when the interplanetary parameter exceeds the amount that can be dissipated by the ionosphere in terms of the Joule heat production, the excess energy is absorbed by the ring current belt, producing an abnormal growth of the ring current index.
    Keywords: ASTROPHYSICS
    Type: Planetary and Space Science; 27; July 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Interaction between a magnetized plasma flow and a strongly magnetized celestial body with an ionized atmosphere - Energetics of the magnetosphere (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Findings on the interaction between a magnetized plasma flow and a strongly magnetized celestial body are described, emphasizing the energetics of the magnetosphere and some astrophysical implications. It is shown that the interaction between the solar wind and the magnetosphere constitutes a dynamo whose power is modulated by the magnetized plasma flow. The varying with time of the flow speed, the magnetic field magnitude, and the latter's orientation are studied along with the reasons for the variation. The mode of dissipation of the generated power in the magnetosphere is investigated. As a preliminary, the basic solar wind conditions in the heliosphere are analyzed. It is shown how a flare-generated disturbance propagates in the heliosphere and how the dynamo power is modulated as the solar wind disturbance collides with the magnetosphere. The origin of geomagnetic storms and auroral phenomena in the dissipation of power in the magnetosphere is detailed.
    Keywords: ASTROPHYSICS
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    NASA TECHNICAL REPORTS
  • 5
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    Modeling of a series of interplanetary disturbance events in September 1978 (1990)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: A series of three interplanetary disturbance events in September 1978 are modeled. Flares responsible for the three shock waves are tentatively identified. It is shown that the computed interplanetary scintillation (IPS) sky maps for flares on September 21 and 23 clearly show that the September 21 flare was responsible for the IPS event and the geomagnetic storms which were observed on September 24-25, although it has been generally believed that a flare on September 23 was their origin. Thus, this is a good example to show the usefulness of IPS observations to identify the responsible solar event and predict the arrival of the shock wave. It is also shown that the IPS event was not caused by a high speed stream from a coronal hole.
    Keywords: ASTROPHYSICS
    Type: Planetary and Space Science (ISSN 0032-0633); 38; 575-586
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    NASA TECHNICAL REPORTS
  • 6
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    Evolution of magnetic flux ropes associated with flux transfer events and interplanetary magnetic clouds (1991)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Spacecraft observations suggest that flux transfer events and interplanetary magnetic clouds may be associated with magnetic flux ropes which are magnetic flux tubes containing helical magnetic field lines. In the magnetic flux ropes, the azimuthal magnetic field is superposed on the axial field. The time evolution of a localized magnetic flux rope is studied. A two-dimensional compressible MHD simulation code with a cylindrical symmetry is developed to study the wave modes associated with the evolution of flux ropes. It is found that in the initial phase both the fast magnetosonic wave and the Alfven wave are developed in the flux rope. After this initial phase, the Alfven wave becomes the dominant wave mode for the evolution of the magnetic flux rope and the radial expansion velocity of the flux rope is found to be negligible. Numerical results further show that even for a large initial azimuthal component of the magnetic field, the propagation velocity along the axial direction of the flux rope remains the Alfven velocity. It is also found that the localized magnetic flux rope tends to evolve into two separate magnetic ropes propagating in opposite directions. The simulation results are used to study the evolution of magnetic flux ropes associated with flux transfer events observed at the earth's dayside magnetopause and magnetic clouds in the interplanetary space.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 96; 1619-163
    Format: text
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    NASA TECHNICAL REPORTS
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