Imprint of the Sun on the Solar Wind

Details Imprint of the Sun on the Solar Wind Imprint of the Sun on the Solar Wind

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...510l..69w&link_type=abstract

The Astrophysical Journal, Volume 510, Issue 1, pp. L69-L72.

Astronomy and Astrophysics

Astronomy

25

Sun: Corona

Scientific paper

Observations of the inner corona in polarized brightness by the Mauna Loa Mk III K-coronameter at 1.15 R_solar and soft X-rays by Yohkoh at 1.03 R_solar are combined with 1995 Ulysses radio occultation measurements of the solar wind to demonstrate that the signatures of the coronal hole boundary, active regions, and bright points are present in the heliocentric distance range of 20-30 R_solar. The existence of these signatures in the brightness of the corona (observed by ranging measurements) and the contrast of the small-scale raylike structures comprising the corona (observed by Doppler scintillation measurements) at such distances can readily be accounted for by open field lines rooted within the complex magnetic structures of the quiet Sun, active regions, and bright points. Hence, with the exception of the small volume of interplanetary space occupied by the heliospheric current sheet that evolves from coronal streamers within a few solar radii of the Sun, small-scale raylike structures carry the imprint of the different density structures of the solar disk approximately radially into the heliosphere.

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