Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...549l.253h&link_type=abstract
The Astrophysical Journal, Volume 549, Issue 2, pp. L253-L256.
Astronomy and Astrophysics
Astronomy
14
Sun: Solar Wind, Sun: Corona
Scientific paper
A quantitative comparison of the latitudinal profile of polarized brightness (pB) measurements nearest the Sun at 1.15 Rsolar by the Mauna Loa Solar Observatory K-Coronameter and Ulysses interplanetary measurements of the fast solar wind during its first south polar pass, at the declining phase of the solar cycle, is made for the first time to identify the sources of the fast solar wind in the context of coronal density structure. Both profiles are found to have the same shape. At the Sun, the minimum coincides with the radial extension of the coronal hole boundaries. The slight rise and plateau following this minimum toward lower latitudes are identified with the coronal extension of the quiet Sun. The corresponding profile of the in situ measured velocity has a maximum within the angular extent of the polar coronal hole and decreases gradually beyond its boundaries. The latitudinal profile of the proton flux mimics the density profile, implying that the mass-loss rate is lowest within the angular extent of the polar coronal hole. The association of the fast wind with a density profile that reflects the polar coronal hole and the surrounding quiet Sun suggests that the fast wind observed by Ulysses originates from both regions. That these conclusions differ from earlier published analyses of the same Ulysses measurements is a consequence of the quantitative and systematic comparison made between Ulysses and coronal measurements at 1.15 Rsolar.
Rifai Habbal Shadia
Woo Richard
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