Heliospheric Selective Ion Acceleration

Details Heliospheric Selective Ion Acceleration Heliospheric Selective Ion Acceleration

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ptep.proc..205r&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

Abundances of the different elements or isotopes in the heliosphere or in the interstellar medium indicate the existence of specific physical processes in the relevant media. Of a particular interest are the observations of enhanced abundances of rare isotopes, modified abundance ratios of minority elements or elements with unusual charge states. The most spectacular heliospheric enhancement involves the energetic 3He isotope and heavy elements (mainly Mg, Ne, Si and Fe) in impulsive solar flares. Primordial nucleosynthesis and galactic evolution confines the coronal ratio of the He isotopes, 3He/4He, to several times 10-4; this ratio is enhanced during impulsive flares by several orders of magnitude due to resonant wave-particle interaction with electromagnetic ion cyclotron (emic) waves. Those heavy elements, which are produced during an earlier galactic evolution and which are not fully ionized at coronal temperatures, are also accelerated by emic waves through higher gyroharmonic resonances by a factor of ~10. The oblique emic waves, which propagate undamped over large distances, are observed on auroral field lines in conjunction with dynamically evolving electron fluxes, and, analogously, are postulated on coronal field lines in conjunction with the X-ray emitting electrons. A possible scenario for a formation of the radioactive 26Al isotope, which decays into the observed fossil element 26Mg, due to the energetic flare-related 3He in the early solar system is suggested.

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