Structures and Dynamics of the Dayside Magnetospheric Boundary observed 
by Hawkeye and IMAGE

Shing F. Fung
NASA GSFC, Greenbelt, MD

The high-altitude cusp and dayside magnetopause boundary layer are the
major regions where solar wind-magnetosphere coupling processes occur. The
occurrence and efficiency of the coupling processes may in fact depend on
the structures and dynamics (or conditions) of the outer magnetospheric
boundary. For example, observations by the Hawkeye spacecraft (1974-1978)
have shown that variable solar wind and interplanetary magnetic field can
affect the global-scale structure of the outer magnetospheric boundary.
The overall configuration of these regions may in turn determine how well
the coupling processes, such as the transfer of mass, momentum and energy,
might be mediated. Recent in situ and remote-sensing observations by the
Radio Plasma Imager (RPI) on IMAGE (launched March 25, 2000) have yielded
new information on the dayside magnetospheric boundary structure and
dynamics. This paper will review pertinent results from Hawkeye and
IMAGE/RPI observations of the structure and dynamics of the outer
magnetospheric boundary layer.
  
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To be presented at the 2002 Spring A.G.U. Meeting, 
Washington, D.C., U.S.A., 28-31 May 2002