Coronal sources of high-speed plasma streams in the solar wind during the declining phase of solar cycle 20

Details Coronal sources of high-speed plasma streams in the solar wind during the declining phase of solar cycle 20 Coronal sources of high-speed plasma streams in the solar wind during the declining phase of solar cycle 20

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.170...55l&link_type=abstract

(IAU, European Regional Astronomy Meeting, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics and Space Science (ISSN 0004-640

Astronomy and Astrophysics

Astrophysics

7

Magnetohydrodynamic Flow, Solar Corona, Solar Cycles, Solar Wind, Coronal Holes, Shock Waves, Solar Flares, Solar Terrestrial Interactions

Scientific paper

A correlative study is made of inferred solar sources of high-speed solar wind streams and extended white-light coronal features. The solar wind data used in the study consist of 110 corotating high-speed plasma streams observed from spacecraft at 1 AU in the period February 1971-December 1974; the coronal data consist of 144 equatorward extensions of polar coronal holes and 15 equatorial coronal holes, derived from K-coronometer maps of the white-light corona during the same period. Of 110 observed solar wind streams, 88 could briefly be associated with an equatorward extension of a polar-cap coronal hole and 14 could be associated with a low-latitude equatorial coronal hole. In 8 cases no visible coronal feature was identified. Of 144 identified polar-cap extensions 102 were associated with a high-speed stream observed at 1 AU; 19 coronal features were related in time to data gaps in the solar wind measurements, while 38 features did not give rise to solar wind streams observed at earth orbit.

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