A linkage between polar patches and plasmaspheric drainage plumes

Two distinct features are shown here to follow the same convection pattern: polar ionization patches and plasmaspheric drainage plumes. In this study, the enhanced ionospheric electron concentration, observed from Millstone Hill incoherent scatter radar, is mapped to the equatorial plane. The resulting trajectory there is found to coincide with the location of the draining plasmasphere as observed from a geosynchronous satellite. The result indicates that both the F‐region electron concentration and the plasmaspheric drainage plume follow the newest separatrix (the boundary between open and closed drift trajectories) convecting sunward. Observations have shown that the polar patches are transported over the polar cap into the night side. Hence, we conclude that the draining plasmasphere should follow a similar trajectory transporting plasmaspheric material over the polar cap into the tail plasma sheet.

[1]  J. Borovsky,et al.  Plasmaspheric material on high‐latitude open field lines , 2001 .

[2]  R. Elphic,et al.  Plasmaspheric material at the reconnecting magnetopause , 2000 .

[3]  S. Wing,et al.  Transformation of high-latitude ionospheric F region patches into blobs during the March 21, 1990, storm , 2000 .

[4]  J. Borovsky,et al.  Magnetospheric dynamics and mass flow during the November 1993 storm , 1998 .

[5]  R. Elphic,et al.  The magnetospheric response to the CME passage of January 10–11, 1997, as seen at geosynchronous orbit , 1998 .

[6]  J. Borovsky,et al.  The superdense plasma sheet: Plasmaspheric origin, solar wind origin, or ionospheric origin? , 1997 .

[7]  R. Elphic,et al.  The Magnetospheric Trough , 1997 .

[8]  R. Elphic,et al.  The fate of the outer plasmasphere , 1997 .

[9]  R. Elphic,et al.  Evolution of plasmaspheric ions at geosynchronous orbit during times of high geomagnetic activity , 1996 .

[10]  R. Greenwald,et al.  A new mechanism for polar patch formation , 1994 .

[11]  B. Barraclough,et al.  Magnetospheric plasma analyzer: Initial three‐spacecraft observations from geosynchronous orbit , 1993 .

[12]  M. F. Thomsen,et al.  Magnetospheric plasma analyzer for spacecraft with constrained resources , 1993 .

[13]  J. Foster.  Storm time plasma transport at middle and high latitudes , 1993 .

[14]  N. Tsyganenko.  A magnetospheric magnetic field model with a warped tail current sheet , 1989 .

[15]  J. Foster.  Plasma Transport through the Dayside Cleft: A Source of Ionization Patches in the Polar Cap , 1989 .

[16]  R. Heelis,et al.  Origin of density enhancements in the winter polar cap ionosphere , 1988 .

[17]  J. Foster,et al.  Plasma convection in the vicinity of the dayside cleft , 1984 .

[18]  J. Grebowsky,et al.  Plasma tail interpretations of pronounced detached plasma regions measured by Ogo 5 , 1974 .

[19]  C. Chappell.  Detached plasma regions in the magnetosphere , 1974 .

[20]  R. Wolf,et al.  EFFECTS ON THE PLASMASPHERE OF A TIME-VARYING CONVECTION ELECTRIC FIELD. , 1972 .