The sources of large-scale heliospheric disturbances

Details The sources of large-scale heliospheric disturbances The sources of large-scale heliospheric disturbances

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..106..185h&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 106, July 1986, p. 185-200.

Astronomy and Astrophysics

Astronomy

81

Heliosphere, Scintillation, Shock Waves, Solar Activity Effects, Solar Wind, Stellar Mass Ejection, Coronal Holes, Radio Sources (Astronomy), Solar Flares, Solar Prominences

Scientific paper

Observations on a grid of 900 radio sources have been used to map and to track large-scale structures in the solar wind at distances of 0.6-1.5 AU from the sun. Most of the disturbances were shells of enhanced density followed by high-speed streams lasting for several days, although more stable corotating interaction regions were also observed. Ninety-six disturbances were mapped during August 1978-September 1979 and those of the 'erupting stream'-type were usually accompanied by shocks and geomagnetic activity if they encountered the earth. Back-projection to the sun indicated sources that were always associated with coronal holes. Possible associations with solar flares and disappearing filaments occurred but on many occasions no flare or filament activity was evident anywhere on the disk within a suitable time interval. It is concluded that erupting streams are transients generated by coronal hole activity. Evidence is presented which further suggests that coronal mass ejections of the 'curved-front' variety may be identified with these erupting streams.

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