Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh22a..01c&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH22A-01
Physics
[2114] Interplanetary Physics / Energetic Particles
Scientific paper
Temporal evolution in elemental abundance ratios in large solar energetic particle (SEP) events has proven to be a powerful tool in investigating interplanetary particle transport processes. In particular, the Fe/O abundance measured at a common energy/nucleon (E/M) typically decreases as a function of time in large SEP events. However, it has been found that for some events originating in the western solar hemisphere this time dependence lessens when the abundance ratio is calculated using O measured at a higher E/M than Fe. Such behavior may be the result of rigidity-dependent scattering processes in the interplanetary medium. In this work, we examine the time dependence of the Fe/O abundance in several large SEP events using ratios calculated at many common and different E/M values between 0.3 and 80 MeV/nucleon. We will discuss the implications regarding rigidity-dependent effects. In addition, we will present analysis of the behavior of the He/H abundance where the charge states (and therefore, the rigidities) of the elements are known.
Cohen M. C.
Mason Glenn M.
Mewaldt Richard A.
Reames Donald. V.
Tylka Allan J.
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