Electronic Resource
Springer
Space science reviews
87 (1999), S. 55-66
ISSN:
1572-9672
Keywords:
corona
;
solar wind
;
composition
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Order of magnitude variations in relative elemental abundances are observed in the solar corona and solar wind. The instruments aboard SOHO make it possible to explore these variations in detail to determine whether they arise near the solar surface or higher in the corona. A substantial enhancement of low First Ionization Potential (FIP) elements relative to high FIP elements is often seen in both the corona and the solar wind, and that must arise in the chromosphere. Several theoretical models have been put forward to account for the FIP effect, but as yet even the basic physical mechanism responsible remains an open question. Evidence for gravitational settling is also found at larger heights in quiescent streamers. The question is why the heavier elements don't settle out completely.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1005157914229
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