Physics – Plasma Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....8009r&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #8009
Physics
Plasma Physics
Scientific paper
Resonant interactions between particles and waves in plasma physics serve a similar function as nuclear cross sections in astrophysics. Small modifications in the parameters of the microscopic, kinetic interactions may result in major consequences on the enrichment of energetic particle populations or on abundances of elements in the Universe. We investigate (a) the acceleration of the main solar wind elements in the interplanetary space by propagating shock waves with their Alfvenic turbulence, (b) the enrichment of energetic rare isotopes and heavy elements in the solar corona through the interaction with Alfven-emic waves, and (c) the energization of relativistic electrons in the geoplasma through interaction with whistler waves. All these wave activities are either measured or deduced from observations. The coronal resonant interaction encompasses small spatial dimensions, the geophysical interaction covers a large bouncing region of the terrestrial magnetic field lines, while the interplanetary interaction is limited to the shock and its turbulence domain, which itself propagates over huge heliospheric dimensions. We show that in all environments, which consist of particular inhomogeneous magnetic field structures, the kinetic interaction results in formation of nonthermal ion and electron distributions, of heavy ions with high charge states, and of relativistic electrons, respectively, all with energies of many MeV. Increased fluxes of radiation-belt electrons pose risk to electronics on board Earth-orbiting satellites, while energetic ions, particularly heavy (like Fe) may pose risk to interplanetary manned mission. The importance of these effects is considered in a context of effects on humans in space and on operation of spacecraft.
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