Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...168..335v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 168, no. 1-2, Nov. 1986, p. 335-340.
Astronomy and Astrophysics
Astrophysics
2
Heavy Ions, Magnetic Flux, Particle Acceleration, Solar Cosmic Rays, Solar Flares, Solar Magnetic Field, Betatrons, Ion Accelerators, Magnetohydrodynamic Waves, Photosphere, Solar Atmosphere, Solar Wind
Scientific paper
In order to examine some aspects of solar cosmic ray acceleration, a discussion is made of the effects of accumulating magnetic field in the plasma trapped inside a magnetic tube. It is shown that when the field builds to 3000 Gauss over 100 seconds it produces a runaway acceleration of heavy ions in the first fifty seconds, if deceleration effects are neglected. As a result, the magnetic tube can become unstable and rise through the corona and possibly release the plasma into the surrounding space. During the build-up of energy in the tube, escape of the particles also becomes important. Two extreme cases of rigidity dependence of the escape parameter are discussed. The cases of linear and reciprocal escape rate with energy are considered. The changes in the differential spectra of the elements by the acceleration process alone as well as with the escape parameters are also calculated. The importance of the model in the context of particle flare observations is noted.
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