Determination of the abundance of aluminum in the solar wind with SOHO/CELIAS/MTOF

Details Determination of the abundance of aluminum in the solar wind with SOHO/CELIAS/MTOF Determination of the abundance of aluminum in the solar wind with SOHO/CELIAS/MTOF

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10512659b&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue A6, p. 12659-12666

Physics

7

Interplanetary Physics, Interplanetary Physics: Sources Of The Solar Wind

Scientific paper

The Al/Mg abundance ratio provides an excellent test case for investigating possible fractionation processes among low First Ionization Potential (FIP) elements in the solar wind. Al and Mg are refractory elements; their abundance ratio has been well determined in solar system materials and inferences for the abundance ratio in the solar atmosphere are reliable. Al and Mg are at neighboring masses and have similar charge state properties in the solar corona; hence mass fractionation effects in the solar wind acceleration process and instrumental mass fractionation are minimal. From first observations during two relatively short periods, one recorded in coronal hole associated solar wind, the other in typical interstream solar wind, it is concluded that the solar wind ratio in both regimes is consistent with the solar system ratio. The Al/Mg ratio in interstream solar wind is 0.081+/-0.012, and in the sample of coronal hole associated solar wind it amounts to 0.076+/-0.011. A comparison of these results with the solar system ratio of 0.079+/-0.005 gives no indication for fractionation occurring among low FIP elements in the solar wind.

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