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| Paper: |
Evidence of a Connection Between Active Region Outflows and
the Solar Wind |
| Volume: |
455, 4th Hinode Science Meeting: Unsolved Problems and Recent Insights |
| Page: |
327 |
| Authors: |
Brooks, D. H.; Warren, H. P. |
| Abstract: |
We present new evidence of a connection between active region (AR)
outflows and the slow speed solar wind from chemical composition
measurements made by the EUV Imaging Spectrometer (EIS) on
Hinode. By combining the differential emission measure (DEM)
distribution derived using low First Ionization Potential (FIP)
elements (Fe and Si) with the modeling of the high FIP element S, we
are able to measure the degree of FIP bias in an observed region. We
have applied this analysis to the outflow areas of AR 10978 observed
in December 2007. Since the results of our study have already been
presented by
Brooks & Warren (2011), we use this short conference proceeding
to show one illustrative example and the methodology in detail. We
focus on the western outflow from AR 10978 observed on December 11 and
show that the FIP bias of 3.4 matches the value of 3.5 measured in
situ three days later at Earth by the Solar Wind Ion Composition
Spectrometer (SWICS) on the ACE spacecraft. We consider this to be
compelling evidence that the plasma in the outflow region really
travels to the slow wind at Earth. |
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