Deriving Coronal Elemental Composition from Large SEP Event Composition

Details Deriving Coronal Elemental Composition from Large SEP Event Composition Deriving Coronal Elemental Composition from Large SEP Event Composition

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh43b1520c&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH43B-1520

Physics

7509 Corona, 7514 Energetic Particles (2114), 7845 Particle Acceleration, 7859 Transport Processes

Scientific paper

Over the last several years detailed measurements, spanning several decades in energy, from the Ultra Low Energy Isotope Spectrometer (ULEIS) and the Solar Isotope Spectrometer (SIS) on the ACE spacecraft have made it clear that many large SEP events exhibit energy-dependent elemental composition, resulting from different spectral forms of the elements when plotted as a function of energy per nucleon. This makes it difficult to infer the coronal composition from SEP abundance ratios obtained at a single energy (or narrow energy interval). Additionally, the data provide evidence that numerous large SEP events have contributions from flare material (either directly or reprocessed through an interplanetary shock), which further complicates the derivation of coronal abundances. We have addressed these issues and calculated coronal abundances from large SEP elemental abundances in the following manner: 1) selected only SEP events which exhibit 3He/4He ratios that are not significantly enhanced over the solar wind value; 2) examined the ratios as a function of energies that are scaled according to expected diffusion-related processes; and 3) corrected individual events for residual Q/M- and FIP-effects. We present the details of this analysis and compare the resulting set of abundances to those of the solar wind, corona, and photosphere.

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