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The past forty years of space research have seen a substantial improvement in our understanding of the Earth’s magnetosphere and its coupling with the solar wind and interplanetary magnetic ?eld (IMF). The magnetospheric str- ture has been mapped and major processes determining this structure have been de?ned. However, the picture obtained is too often static. We know how the magnetosphere forms via the interaction of the solar wind and IMF with the Earth’s magnetic ?eld. We can describe the steady state for various upstream conditions but do not really understand the dynamic processes leading from one state to another. The main dif?culty is that the magnetosphere is a comp- cated system with many time constants ranging from fractions of a second to days and the system rarely attains a steady state. Two decades ago, it became clear that further progress would require multi-point measurements. Since then, two multi-spacecraft missions have been launched — INTERBALL in 1995/96 and CLUSTER II in 2000. The objectives of these missions d- fered but were complementary: While CLUSTER is adapted to meso-scale processes, INTERBALL observed larger spatial and temporal scales. However, the number of papers taking advantage of both missions simul- neously is rather small.

Magnetosphere. --- Magnetosphere --- Magnétosphère --- Congresses. --- Congrès --- EPUB-LIV-FT LIVPHYSI SPRINGER-B

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This collection of papers will address the question "What is the Magnetospheric Cusp?" and what is its role in the coupling of the solar wind to the magnetosphere as well as its role in the processes of particle transport and energization within the magnetosphere. The cusps have traditionally been described as narrow funnel-shaped regions that provide a focus of the Chapman-Ferraro currents that flow on the magnetopause, a boundary between the cavity dominated by the geomagnetic field (i.e., the magnetosphere) and the external region of the interplanetary medium. Measurements from a number of recent satellite programs have shown that the cusp is not confined to a narrow region near local noon but appears to encompass a large portion of the dayside high-latitude magnetosphere and it appears that the cusp is a major source region for the production of energetic charged particles for the magnetosphere. Audience: This book will be of interest to space science research organizations in governments and industries, the community of Space Physics scientists and university departments of physics, astronomy, space physics, and geophysics.

Magnetosphere --- Magnetospheric boundary layer. --- Magnetospheric currents. --- Research. --- Currents, Magnetospheric --- Magnetospheric current systems --- Electric fields --- Boundary layer (Meteorology) --- Atmosphere, Upper --- Upper atmosphere --- Astrophysics. --- Physical geography. --- Classical Electrodynamics. --- Geophysics and Environmental Physics. --- Atomic, Molecular, Optical and Plasma Physics. --- Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics). --- Geophysics/Geodesy. --- Astronomy, Observations and Techniques. --- Geography --- Astronomical physics --- Astronomy --- Cosmic physics --- Physics --- Optics. --- Electrodynamics. --- Geophysics. --- Atoms. --- Physics. --- Space sciences. --- Observations, Astronomical. --- Astronomy—Observations. --- Astronomical observations --- Observations, Astronomical --- Science and space --- Space research --- Cosmology --- Science --- Light --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics --- Chemistry, Physical and theoretical --- Matter --- Stereochemistry --- Geological physics --- Terrestrial physics --- Earth sciences --- Constitution