The geospace environment has been viewed as a mixing bowl for plasmas of both solar and
terrestrial origin. Our perspective on the nature of the supply mechanisms has undergone a …

Unlike most cosmic plasma structures, planetary magnetospheres can be extensively
studied in situ. In particular, studies of the Earth's magnetosphere over the past few decades …

A series of recent measurements of the outflow of ionization from the ionosphere have
further heightened our awareness of the strength of the ionospheric source of …

Particles of roughly magnetosheath energies precipitate at low altitudes throughout the
dayside, in a band referred to as the cusp or cleft. Recently it has been suggested that the …

Although it has become well established that the low‐altitude polar cusp moves
equatorward during intervals of southward interplanetary magnetic field (IMF Bz< 0), many …

The plasma sheet boundary layer is a temporally variable transition region located between
the magnetotail lobes and the central plasma sheet. We have made a survey of these …

Standard models of the Earth's outer magnetospheric waveguide assume that a perfectly
reflecting magnetopause can trap energy inside the waveguide. In contrast, we show that …

The dayside zone of soft precipitation can be divided into four distinct types of plasma
regimes, each corresponding to the respective magnetospheric source region: the cusp, the …

The first three magnetospheric plasma analyzer (MPA) instruments have been returning
data from geosynchronous orbit nearly continuously since late 1989, 1990, and 1991. These …

An on‐line data base consisting of the auroral oval boundaries, structure, and particle fluxes
from the DMSP F7 and F9 satellites from December 1983 through the present (with about an …