Plasma sheet formation during long period of northward IMF

We have studied the entry paths of solar wind plasma into the magnetosphere during an extended period of northward IMF using an OpenGGCM MHD simulation of the cold dense plasma sheet (CDPS) event observed on October 23, 2003 by the Cluster spacecraft. We find that high‐latitude reconnection occurs tailward of both cusps between the IMF and geomagnetic field. The newly created closed magnetic flux tubes capture magnetosheath plasma, and subsequently sink and shrink into the magnetosphere, while convecting tailward. The plasma that enters near the reconnection site is driven sunward and toward the low latitude region initially; it then drifts to the flanks. The captured plasma is characterized by small flow velocity, and it is moderately heated in the reconnection region. In the present case study we find the cold plasma enters the plasma sheet in the near Earth tail where it is observed by Cluster.

[1]  M. Fujimoto,et al.  Spatial and Temporal Variations of the Cold Dense Plasma Sheet: Evidence for a Low‐Latitude Boundary Layer Source? , 2013 .

[2]  S. Wing,et al.  Global cooling and densification of the plasma sheet during an extended period of purely northward IMF on October 22–24, 2003 , 2005 .

[3]  I. Papamastorakis,et al.  First multispacecraft ion measurements in and near the Earth's magnetosphere with the identical Cluster ion spectrometry (CIS) experiment , 2001 .

[4]  J. Steinberg,et al.  Geotail observations of the Kelvin‐Helmholtz instability at the equatorial magnetotail boundary for parallel northward fields , 2000 .

[5]  Clinton P. T. Groth,et al.  A numerical study of solar wind—magnetosphere interaction for northward interplanetary magnetic field , 1999 .

[6]  M. Yamauchi,et al.  Energetic ion outflow from the dayside ionosphere: Categorization, classification, and statistical study , 1999 .

[7]  R. Elphic,et al.  Composition measurements in the dusk flank magnetosphere , 1999 .

[8]  R. Elphic,et al.  The driving of the plasma sheet by the solar wind , 1998 .

[9]  S. Wing,et al.  Central plasma sheet ion properties as inferred from ionospheric observations , 1998 .

[10]  M. Fujimoto,et al.  Plasma entry from the flanks of the near‐Earth magnetotail: Geotail observations , 1998 .

[11]  James A. Slavin,et al.  Boundary layer formation in the magnetotail: Geotail observations and comparisons with a global MHD simulation , 1997 .

[12]  M. Fujimoto,et al.  Solar wind control of density and temperature in the near‐Earth plasma sheet: WIND/GEOTAIL collaboration , 1997 .

[13]  M. Fujimoto,et al.  Plasma Entry from the Flanks of the Near-Earth Magnetotail : GEOTAIL Observations in the Dawnside LLBL and the Plasma Sheet , 1996 .

[14]  Joachim Raeder,et al.  The structure of the distant geomagnetic tail during long periods of northward IMF , 1995 .

[15]  W. Lennartsson.  A scenario for solar wind penetration of earth's magnetic tail based on ion composition data from the ISEE 1 spacecraft , 1992 .

[16]  C. Russell,et al.  Model of the formation of the low-latitude boundary layer for strongly northward interplanetary magnetic field , 1992 .

[17]  G. Paschmann,et al.  Average plasma properties in the central plasma sheet , 1989 .

[18]  E. G. Shelley,et al.  Energetic Auroral and Polar Ion Outflow at DE 1 Altitudes' Magnitude, Composition, Magnetic Activity Dependence, and Long-Term Variations , 1985 .

[19]  E. W. Hones,et al.  Structure of the low‐latitude boundary layer , 1980 .

[20]  E. W. Hones,et al.  Simultaneous measurements of magnetotail dynamics by IMP spacecraft , 1980 .

[21]  S. Cowley.  Plasma populations in a simple open model magnetosphere , 1980 .

[22]  H. Rosenbauer,et al.  Heos 2 plasma observations in the distant polar magnetosphere: The plasma mantle , 1975 .

[23]  J. Dungey.  Interplanetary Magnetic Field and the Auroral Zones , 1961 .

[24]  P. Newell,et al.  Earth's low-latitude boundary layer , 2003 .

[25]  Johan C. Raeder,et al.  Global geospace modeling: Tutorial and review , 2001 .

[26]  V. Angelopoulos,et al.  Wind Observations of the Halo/Cold Plasma Sheet , 1998 .