A survey of coronal holes and their solar wind associations throughout sunspot cycle 20

Details A survey of coronal holes and their solar wind associations throughout sunspot cycle 20 A survey of coronal holes and their solar wind associations throughout sunspot cycle 20

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...56..161b&link_type=abstract

Solar Physics, vol. 56, Jan. 1978, p. 161-183.

Astronomy and Astrophysics

Astronomy

28

Solar Corona, Solar Wind, Sunspot Cycle, Solar Magnetic Field, Solar Wind Velocity, Ultraviolet Astronomy, X Ray Imagery

Scientific paper

Space-borne X-ray and XUV observations during the period 1963-74 (corresponding approximately with solar cycle 20) have been used to investigate the relationship between the occurrence and variability of coronal holes and solar activity, i.e., the solar wind. Results indicate that polar holes (prominent at solar minimum) decreased in area as solar activity increased. The equatorial holes were also small during this period and persisted for one or two solar rotations only. Solar wind streams in excess of 500 km/s were associated with coronal holes at less than 40 deg latitude, although solar coronal holes appear to have no associated wind streams at earth.

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