Solar Wind Composition at Solar Maximum

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Scientific paper

Although coronal mass ejections have traditionally been thought to contribute only a minor fraction to the total solar particle flux, and although such events mainly occur in lower heliographic latitudes, the impressive spectacle of eruptions - observed with SOHO/LASCO even at times of solar minimum - indicates that an important part of the low-latitude solar corona is fed with matter and magnetic fields in a highly transient manner. Elemental and isotopic abundances determined with the new generation of particle instruments with high sensitivity and strongly enhanced time resolution indicate that, apart from FIP/FIT-fractionation, mass-dependent fractionation can also influence the replenishment of the thermal ion population of the corona. Furthermore, selective enrichment of the thermal coronal plasma with rare species such as 3He can occur. Such compositional features have until recently only been found in energetic particles from impulsive flare events. This review will concentrate on this and other aspects of the present solar maximum and conclude with some outlook on future investigations of near-terrestrial space climate (the generalized counterpart of ‘space weather’).

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