The Localization of Particle Acceleration Sites in Solar Flares and CMES
- 113 Downloads
We review the particular aspect of determining particle acceleration sites in solar flares and coronal mass ejections (CMEs). Depending on the magnetic field configuration at the particle acceleration site, distinctly different radiation signatures are produced: (1) If charged particles are accelerated along compact closed magnetic field lines, they precipitate to the solar chromosphere and produce hard X-rays, gamma rays, soft X-rays, and EUV emission; (2) if they are injected into large-scale closed magnetic field structures, they remain temporarily confined (or trapped) and produce gyrosynchrotron emission in radio and bremsstrahlung in soft X-rays; (3) if they are accelerated along open field lines they produce beam-driven plasma emission with a metric starting frequency; and (4) if they are accelerated in a propagating CME shock, they can escape into interplanetary space and produce beam-driven plasma emission with a decametric starting frequency. The latter two groups of accelerated particles can be geo-effective if suitably connected to the solar west side. Particle acceleration sites can often be localized by modeling the magnetic topology from images in different wavelengths and by measuring the particle velocity dispersion from time-of-flight delays.
Keywordssolar flares coronal mass ejections particle acceleration
Unable to display preview. Download preview PDF.
- Aschwanden, M. J.: 2004, Physics of the Solar Corona — An Introduction, Praxis Publishing Ltd., Chichester UK, and Springer, New York, ISBN 3-540-22321-5, 842 p.Google Scholar
- Aschwanden, M. J.: 2005, in Gopalswamy, N., Mewaldt, R., and Torsti, J. (eds.), AGU Monograph ”Solar Eruptions and Energetic Particles“, Vol. 165, p. 189.Google Scholar
- Cane, H. V., Stone, R. G., Fainberg, J., Stewart, R. T., Steinberg, J. L., and Hoang, S.: 1981, JGR 8/12, 1285.Google Scholar
- Neugebauer, M., Liewer, P. C., Smith, E. J., Skoug, R. M., and Zurbuchen, T. H.: 2002, JGR (Space Physics) 107, Issue A12, pp. SSH 13-1, CiteID 1488, DOI 10.1029/2001JA000306.Google Scholar
- Poquérusse, M., Hoang, S., Bougeret, J. L., and Moncuquet, M.: 1996, in Winterhalter, D., Gosling, J. T., Habbal, S. R., Kurth, W. S., and Neugebauer, M. (eds.), Solar Wind Eight, Internat. Solar Wind Conference, held in Dana Point, California, June 1995, AIP Press, New York, American Institute of Physics Conference Proceedings AIP CP-382, pp. 62–65.Google Scholar