Lithium-6 from Solar Flares |
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Reuven Ramaty Submitted: 2000-03-27 19:01
By introducing a hitherto ignored Li-6 producing process, due to accelerated He-3 reactions with He-4, we show that accelerated particle interactions in solar flares produce much more Li-6 than Li-7. By normalizing our calculations to gamma-ray data we demonstrate that the Li-6 produced in solar flares, combined with photospheric Li-7, can account for the recently determined solar wind lithium isotopic ratio, obtained from measurements in lunar soil, provided that the bulk of the flare produced lithium is evacuated by the solar wind. Further research in this area could provide unique information on a variety of problems, including solar atmospheric transport and mixing, solar convection and the lithium depletion issue, and solar wind and solar particle acceleration.
Authors: R. Ramaty, V. Tatischeff, J. P. Thibaud, B. Kozlovsky, N. Mandzhavidze
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Publication Status: ApJ Letters, 2000, in press
Last Modified: 2000-03-27 19:01
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High Energy Processes in Solar Flares |
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Reuven Ramaty Submitted: 1999-12-24 04:05
We review the highlights of the high energy processes in solar flares. Particle acceleration is an essential ingredient of the flare energy release process. Among all cosmic high energy sources, flares are unique in that both the accelerated particle and the radiations that they produce are observed. In this paper we emphasize the radiations, gyrosynchrotron emission, bremsstrahlung and gamma ray lines. These provide information on flare models, magnetic fields, energy content in the accelerated particles and abundances. The abundances are not only critical for constraining the acceleration mechanisms, but also provide unique information on solar atmospheric dynamics and mixing, solar wind acceleration, and Galactic chemical evolution.
Authors: Reuven Ramaty and Natalie Mandzhavidze
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Publication Status: Cosmic Explosions, AIP, S. Holt and W. Zhang eds., in press
Last Modified: 1999-12-24 04:05
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