Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh33a1074m&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH33A-1074
Physics
2114 Energetic Particles (7514), 7514 Energetic Particles (2114), 7807 Charged Particle Motion And Acceleration, 7845 Particle Acceleration, 7859 Transport Processes
Scientific paper
Although the Sun is never completely quiet, various studies over the last 40 years have reached the conclusion that there exist some minimum quiet-time intensities of low-energy ions <10 MeV/nucleon that may vary over the solar cycle, but are more or less reproducible. Recently, Fisk and Gloeckler have reported that quiet-time energy spectra of protons measured by Ulysses in the suprathermal energy range from 10 to 60 keV have a common spectral shape with a spectral index of -5 in velocity space (corresponding to a power law in energy with a spectral index of -1.5). We present the results of a survey that extends the work of Fisk and Gloeckler to somewhat higher energies, based on data from ACE and STEREO ranging from 0.1 to 30 MeV/nucleon. We find that the spectra of the H, He, O and Fe from 0.1 to 1 MeV/nucleon are typically somewhat steeper than reported by Fisk and Gloeckler. We compare the composition and spectral shapes of major species from H to Fe over the years from 1997 to 2007, and discuss the implications for the origin of the quiet-time intensities in the suprathermal energy range.
Cohen M. C.
Dwyer Joesph R.
Leske Richard A.
Mason Glenn M.
Mazur J. E.
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