Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh11b0712t&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH11B-0712
Astronomy and Astrophysics
Astrophysics
2164 Solar Wind Plasma, 7500 Solar Physics, Astrophysics, And Astronomy, 7514 Energetic Particles (2114), 7522 Helioseismology, 7529 Photosphere
Scientific paper
Sophisticated helioseismological models that reproduce the speed of sound in the solar interior to a remarkable degree of accuracy include chemical abundance gradients in the solar interior. These gradients are established in the course of solar evolution by the gradual settling or segregation of elements due to their differing atomic and nuclear properties and masses. Based on current helioseismological evidence, one expects that the heavy elements have been depleted relative to hydrogen on the order of 10% in the course of solar evolution. We investigate whether this effect can be measured quantitatively with new solar wind and solar nergetic particle elemental and isotopic abundance measurements. SOHO, ACE, and Genesis offer unprecedented precision in such in situ measurements. We compare the most recent SOHO and ACE measurements with meteoritic data and discuss expectations for Genesis. Our results indicate that for elemental abundance ratios, Ca/Fe is the most promising candidate to investigate, while the isotopic ratio 3He/4He is more promising from the helioseismological point of view. We compare our results with the most recent solar wind and solar energetic particle results and discuss possible difficulties in relating observations to evolutionary segregation effect.
Turcotte S.
Wimmer-Schweingruber Robert F.
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