What can we learn from heavy ion spectra in large SEP events?

Details What can we learn from heavy ion spectra in large SEP events? What can we learn from heavy ion spectra in large SEP events?

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh14a..08h&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH14A-08

Physics

7513 Coronal Mass Ejections (2101), 7514 Energetic Particles (2114), 7924 Forecasting (2722), 7959 Models

Scientific paper

Particle spectra at a CME-driven shocks can be approximated by either a power law with exponential roll over or by a broken power law. In both cases, an important parameter, the breaking energy E0, can be extracted from observations. Since the shape of particle spectra is a result of the balance between two competing processes: particle acceleration at the shock and particle loss from the shock, the parameter E0 contains rich information about both processes. In this work, we study the dependence of E0 on (Q/A), i. e. E0 for various heavy ions. It has been shown that the value of E0 for heavy ions often exhibit a (Q/A)α dependence with alpha ranging from 1 to 2, varying from event to event. We discuss how α can depend on both the acceleration process and the loss process and what can we learn from the (Q/A)α dependence of E0.

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