Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..153l&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 2, p. 153-156
Astronomy and Astrophysics
Astrophysics
10
Interplanetary Physics: Energetic Particles, Solar, Solar Physics, Astrophysics, And Astronomy: Corona, And Astronomy: Flares
Scientific paper
Using the Solar Isotope Spectrometer on the Advanced Composition Explorer, we have measured the isotopic composition of solar energetic particles (SEPs) with energies of tens of MeV/nucleon during the November 6, 1997 solar event, including isotopes never before reported in SEPs, such as 34S, 38Ar, 44Ca, 54Fe, and 60Ni, as well as isotopes of C, N, O, Ne, Mg, and Si. Abundances are found to be enhanced by factors of ~2 relative to the standard solar system values for 22Ne/20Ne and 26Mg/24Mg. Overall, the enrichments of the isotope ratios show a correlation with the ratio of masses, M2/M1, scaling approximately as (M2/M1)7, although significant deviations from this trend are evident.
Christian Eric R.
Cohen Christina Mae S.
Cummings Alan C.
Dougherty Brian L.
Leske Richard A.
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