Physics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36..301h&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 36, March 1988, p. 301-306.
Physics
2
Interplanetary Magnetic Fields, Shock Waves, Solar Activity Effects, Solar Flares, Solar Terrestrial Interactions, Coronal Holes, Geomagnetism, Heliosphere, Solar Physics, Solar Planetary Interactions
Scientific paper
Recent observations using IPS mapping do not support the popular theory that large-scale transients associated with interplanetary shocks are caused by solar flares. Back-projection to the sun has shown that the transients are caused by intermittent blasts of high-speed solar wind generated by coronal holes. A prime example of supposedly flare-generated phenomena occurred during August 2-9, 1972, when there were outstanding geomagnetic storms and particle events. A reassessment of the evidence, including hitherto unpublished IPS data, now points strongly toward a large equatorial coronal hole as the real source of the disturbances. The coronal hole was correctly positioned on the disk and was the only significant low-latitude hole to have occurred for several weeks before and after the events. When flare-associations for the shocks are abandoned there is no need to assume an excessive speed for one shock.
Hewish Antony
Houminer Zwi
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