Observational Aspects of Solar and Heliospheric Particles

Details Observational Aspects of Solar and Heliospheric Particles Observational Aspects of Solar and Heliospheric Particles

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ptep.proc..147k&link_type=abstract

Plasma Turbulence and Energetic Particles in Astrophysics, Proceedings of the International Conference, Cracow (Poland), 5-10 Se

Astronomy and Astrophysics

Astrophysics

Scientific paper

Energetic particles of solar, heliospheric and galactic origin are simultaneously present in the interplanetary environment of earth. Solar-heliospheric particles predominate below a certain energy, and galactic cosmic rays above. The separating energy depends on solar activity, shifting from several Mev to tens of MeV with increasing activity. Plasma turbulence, waves and discontinuities influence the propagation properties of those charged particles. Energetic particle fluxes both in the inner and outer parts of the heliosphere change with solar and interplanetary conditions. Long-term measurements aboard IMP-8 and some other spacecraft provide now a good 1 AU baseline near the ecliptic plane, while Ulysses covers the high-latitude inner heliosphere and the Voyager probes the distant heliosphere, including the approach toward the termination shock of the supersonic solar wind. After a survey of large-scale heliospheric structure, flux distributions as measured by instruments aboard inner heliospheric satellites and space probes will be considered, with particular emphasis on periods with very low and very high fluxes at sub-MeV, MeV, and higher energies. The measured frequencies of occurrence of high fluxes and fluences at 1 AU can, with some uncertainties, be used for extrapolation to very long time periods. Recent progress in those fields will be reviewed.

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