Determination of Sulfur Abundance in the Solar Wind |
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Authors: | C Giammanco P Bochsler R Karrer F M Ipavich J A Paquette P Wurz |
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Institution: | 1. Physikalisches Institut der Universit?t Bern, Sidlerstrasse 5, 3012, Bern, Switzerland 2. University of Maryland, College Park, MD, 20742, USA
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Abstract: | Solar chemical abundances are determined by comparing solar photospheric spectra with synthetic ones obtained for different
sets of abundances and physical conditions. Although such inferred results are reliable, they are model dependent. Therefore,
one compares them with the values for the local interstellar medium (LISM). The argument is that they must be similar, but
even for LISM abundance determinations models play a fundamental role (i.e., temperature fluctuations, clumpiness, photon
leaks). There are still two possible comparisons—one with the meteoritic values and the second with solar wind abundances.
In this work we derive a first estimation of the solar wind element ratios of sulfur relative to calcium and magnesium, two
neighboring low-FIP elements, using 10 years of CELIAS/MTOF data. We compare the sulfur abundance with the abundance determined
from spectroscopic observations and from solar energetic particles. Sulfur is a moderately volatile element, hence, meteoritic
sulfur may be depleted relative to non-volatile elements, if compared to its original solar system value. |
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Keywords: | Sun: abundances Sun: solar wind |
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