Physics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985esasp.235..101s&link_type=abstract
In ESA Future Missions in Solar, Heliospheric and Space Plasma Physics p 101-105 (SEE N86-27330 18-12)
Physics
Magnetohydrodynamic Stability, Planetary Magnetic Fields, Plasma Acceleration, Plasmas (Physics), Solar Corona, Earth Magnetosphere, Magnetic Flux, Neutral Sheets, Plasma Diagnostics, Solar Atmosphere, Stellar Mass Ejection
Scientific paper
The formation and acceleration of plasmoids, observed in the laboratory, in the magnetosphere, and in the solar atmosphere are discussed. Results suggest that the formation and ejection of plasmoids is a dominant loss process for mass and energy accumulated in closed flux regions in the magnetic field of planets and stars, under nearly ideal MHD conditions. Formation occurs via an instability if, during energy storage, nonideal plasma effects become important. The instability is based on the attraction of parallel electric current. This phenomenon is a (partial) collapse of a portion of the plasma sheet. The accelerating forces arise from the change of topology of the magnetic field by spontaneous magnetic reconnection. Observationally, the separation of space and time dependence is essential to study plasmoid magnetic topology, the three dimensional plasma structure including superthermal population and ionic composition, and the basic dissipation mechanism.
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