On the influence of the magnetization of a model solar wind on a laboratory magnetosphere

The interaction of a magnetized plasma beam with a stationary dipole field, analogous to the interaction of the solar wind with the Earth's magnetosphere, is explored in a laboratory experiment. Experimental parameters are chosen to scale qualitatively similar to the parameters in the Earth's magnetosphere. We find that the magnetization of the laboratory “solar wind,” generated by injecting a plasma across a preexisting magnetic field, requires a certain minimum magnetic field strength. Differences between the resulting magnetospheres for northward and southward “solar wind” or “interplanetary” magnetic fields (IMF) are demonstrated by global pictures and by magnetic field measurements above the north polar region. These measurements show patterns of the variation of the transverse field component which are similar to those found by satellite measurements above the Earth. This indicates the presence of similar field-aligned current systems. We demonstrate particularly the presence (for northward IMF) and absence (for southward IMF) of the pattern attributed to the “NBZ” (northward Bz) current system.

[1]  F. Wessel,et al.  Fast magnetization of a high‐to‐low‐beta plasma beam , 1990 .

[2]  H. Rahman,et al.  Laboratory simulation of the large-scale Birkeland current system in the polar region with northward interplanetary magnetic field , 1989 .

[3]  S. Akasofu,et al.  Laboratory simulation of the interplanetary magnetic field effects on the magnetosphere , 1986 .

[4]  L. Zanetti,et al.  The Relationship of Birkeland and Ionospheric Current Systems to the Interplanetary Magnetic Field , 1986 .

[5]  S. Minami,et al.  Flow of artificial plasma in a simulated magnetosphere: Evidence of direct interplanetary magnetic field control of the magnetosphere , 1985 .

[6]  W. J. Burke,et al.  Ionospheric evidence for irregular reconnection and turbulent plasma flows in the magnetotail during periods of northward interplanetary magnetic field , 1985 .

[7]  Wolfgang Baumjohann,et al.  Ionospheric and Birkeland current distributions for northward interplanetary magnetic field: Inferred polar convection , 1984 .

[8]  L. Zanetti,et al.  Large-scale Birkeland currents in the dayside polar region during strongly northward IMF: A new Birkeland current system , 1984 .

[9]  P. Baum,et al.  The laboratory magnetosphere , 1982 .

[10]  J. Burrows,et al.  Comparison of magnetic field perturbations and solar electron profiles in the polar cap , 1980 .

[11]  W. J. Burke,et al.  Polar cap electric field structures with a northward interplanetary magnetic field , 1979 .

[12]  E. Dubinin,et al.  The magnetic field on the magnetospheric boundary from laboratory simulation data , 1978 .

[13]  T. Potemra,et al.  Field‐aligned currents in the dayside cusp observed by Triad , 1976 .

[14]  T. Potemra,et al.  The amplitude distribution of field-aligned currents at northern high latitudes observed by TRIAD. Interim report , 1975 .

[15]  L. Danielsson,et al.  EXPERIMENTAL STUDY OF THE FLOW OF A MAGNETIZED PLASMA THROUGH A MAGNETIC DIPOLE FIELD , 1965 .

[16]  N. Fukushima,et al.  Model experiment for the interaction of solar plasma stream and geomagnetic field , 1964 .

[17]  M. Bachynski,et al.  Laboratory studies of the variation of the magnetosphere with solar wind properties , 1964 .

[18]  J. Cladis,et al.  Interaction of a supersonic plasma stream with a dipole magnetic field , 1964 .

[19]  W. H. Bostick,et al.  Plasma flow around a three-dimensional dipole , 1963 .