Energetic Particles Related with Coronal and Interplanetary Shocks
Acceleration of electrons and ions at the Sun is discussed in the framework of CME-driven shocks. Based on the properties of coronal mass ejections associated with type II bursts at various wavelengths, the possibility of a unified approach to the type II phenomena is suggested. Two aspects of primary importance to shock accelerations are: (1) Energy of the driving CME and (2) the conditions in the medium that supports shock propagation. The high degree of overlap between CMEs associated with large solar energetic particle events and type II bursts occurring at all wavelengths underscores the importance of CME energy in driving shocks far into the interplanetary medium. Presence of preceding CMEs can alter the conditions in the ambient medium, which is shown to influence the intensity of large solar energetic particle events. Both statistical evidence and case studies are presented that underscore the importance of the ambient medium.
KeywordsSolar Phys Radio Burst Interplanetary Shock Alfven Speed Large Solar Energetic Particle Event
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- J. K. Chao: In Solar Wind Three, ed by C. T. Russell (Univ. California Los Angeles), (1974), pp. 169–174Google Scholar
- N. Gopalswamy: A Global Picture of CMEs in the Inner Heliosphere, In: The Sun and the Heliosphere as an Integrated System, ed by G. Poletto and S. Suess (Kluwer, Berlin Heidelberg New York 2004b), pp. 201–252Google Scholar
- N. Gopalswamy: Interplanetary Radiobursts. In Solar and Space Weather Radiophysics, ed by D. Gary and C. Keller (Kluwer, Berlin Heidelberg New York 2004c), pp. 305–333Google Scholar
- N. Gopalswamy: Geophys. Res. Lett. 30, SEP1-1 (2003)Google Scholar
- N. Gopalswamy, S. Yashiro, A. Lara et al.: Geophys. Res. Lett. 30, SEP 3–1 (2003a)Google Scholar
- N. Gopalswamy, S. Yashiro, S. Krucker, R. A. Howard: CME Interaction and the Intensity of Solar Energetic Particle Events. In: Coronal and Stellar Mass ejections, IAU Symposium No. 226, ed by K. Dere, J. Wang and Y. Yan, pp. 367–373 (2005a)Google Scholar
- N. Gopalswamy, E. Aguilar-Rodriguez, S. Yashiro et al.: J. Geophys. Res. 110, A12, A12S07 (2005b)Google Scholar
- R. P. Lin: Solar Flare Particles, in: From the Sun: Auroras Magnetic Storms, Solar Flares, Cosmic Rays, ed by S. T. Suess and B. T. Tsurutani, (American Geophysical Union, Washington, DC. 1998), pp. 91–102Google Scholar
- G. Mann, A. Klassen, C. Estel, B. J. Thompson: In: Proc. of 8th SOHO Workshop, ed by J.-C. Vial and B. Kaldeich-Schürmann. (ESA, 1999), p. 477Google Scholar
- G. J. Nelson, D. B. Melrose: Type II bursts. In: Solar Radiophysics, ed by D. J. McLean and N.R. Labrum, (Cambridge University Press, Cambridge 1985), pp. 333–359Google Scholar