The past decade transformed our observational understanding of energetic particle
processes in near‐Earth space. An unprecedented suite of observational systems was in …

Planned active space experiments and ideas for future active space experiments are
reviewed. Three active experiments being readied are DSX (Demonstration and Space …

Energetic electrons can be trapped in Earth's magnetic field, forming the radiation belts (also
known as the Van Allen Belts). These electrons, which can originate from the solar wind or a …

Based on discussions held at a workshop in Bra-Pollenzo, Italy, this paper elaborates upon
19 outstanding questions of plasma physics in the Earth's magnetosphere. The questions …

An active map** mission is described that unambiguously connects measurements in the
Earth's magnetosphere to visible aurora in the atmosphere. The core of the mission is an …

Renewed interest in active experiments with relativistic particle beams in space has led to
the development of solid-state radio-frequency (RF) linear accelerators (linac) that can …

Insufficiently accurate magnetic-field-line map** between the aurora and the equatorial
magnetosphere prevents us from determining the cause of many types of aurora. An …

Electron beam structures generated in the Earth′ s near-space play very important roles in
influencing the space radiation environment. The dynamics of the electron beams travelling …

Nonlinear plasma solitons have been recently proposed as a possible, indirect way to detect
dangerous small orbital debris in low Earth orbit. A kinetic simulation study of the interaction …

Hollow cathode plasma contactors have an extensive history as spacecraft neutralizers, but
questions remain on whether the technology can neutralize significant positive charging in …