Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh41a..02s&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH41A-02
Physics
2104 Cosmic Rays, 2114 Energetic Particles (7514), 2134 Interplanetary Magnetic Fields, 2139 Interplanetary Shocks
Scientific paper
Solar Energetic Particle (SEP) populations are a common occurrence during the years surrounding solar maximum. They are frequently observed coincident with interplanetary shocks and their associated Energetic Storm Particle (ESP) populations. However, while it is true that SEP ions may be accelerated by shocks (perhaps the very same shocks) closer to the sun, the energetic ions escape the scattering confines of the shock to become an independent population that evolves far upstream of the shock without direct contact or dependence upon the shock's presence or evolution after the initial acceleration phase. We ask the question "Do these SEP ions excite magnetic waves as they propagate away from the Sun?". We examine Advanced Composition Explorer (ACE) observations from 1 AU and find that in many cases the SEP ions do continue to excite low-frequency magnetic fluctuations due to a significant degree of free energy. However, unlike ESP-associated waves, the SEP-associated waves often closely resemble the spectrum of background turbulence with only a rising level of energy pointing to a separate source. We postulate that at times the injection of magnetic energy is so slow that the background turbulent cascade competes with the injection process so that the spectrum rises in power, but does not display the resonant or "upstream wave" spectrum characteristic of ion foreshocks. In this regard, SEP-associated wave enhancements are much like waves due to interstellar pickup ions for which the energy injection and turbulent transport are competing processes.
Culver A.
Desai Michael M.
Haggerty Dennis K.
Hu Qiang
Isman G.
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