Spatial and temporal behavior of the oxygen abundance in a streamer complex

Details Spatial and temporal behavior of the oxygen abundance in a streamer complex Spatial and temporal behavior of the oxygen abundance in a streamer complex

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..545b&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

Streamer, Oxygen Abundance, In Situ Data

Scientific paper

The determination of the abundance of trace elements in different solar structures and in the solar wind may be crucial for the identification of the solar wind sources. In the last few years, SOHO data allowed an evaluation of the oxygen abundance at previously unattainable coronal levels (Zangrilli et al., 2001). Analyses of streamer data taken at the minimum of the solar activity cycle raised the question of whether streamers' legs might be the site where slow wind originates, because the oxygen abundance in the lateral branches of the streamer, at coronal levels, turned out to be similar to the slow wind abundance. In this work we analyse UVCS streamers observations, taken at 1.6Rsolar, near the maximum phase of the activity cycle, to check whether the behavior found at minimum is shared by streamers at maximum. We derive also the abundance of oxygen in different streamers and, within a streamer, across its axis, to get more information on the spatial variability of the oxygen abundance. Our results show that the oxygen abundance in different streamers may be significantly different, implying that a more thorough analysis is needed before drawing conclusions about the site where slow wind originates.

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