Other
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24..381h&link_type=abstract
Planetary and Space Science, vol. 24, Apr. 1976, p. 381-388.
Other
18
Geomagnetism, Long Term Effects, Solar Activity Effects, Solar Corona, Kp Index, Magnetic Disturbances, Solar Cycles, Solar Flares, Time Response
Scientific paper
Daily measurements of the intensity distribution of the sun's white-light corona over the height range 1.1-2.7 solar radii show that the global structure became quite stable (constant over periods of several months) in late 1973 and throughout 1974, as flares, ascending prominences, and other transient activity became less frequent with the decline of the solar activity cycle. A highly persistent pattern of geomagnetic activity prevailed for much of this time. Bright coronal structures in the ecliptic plane were associated with geomagnetically quiet conditions, and faint coronal regions ('holes') with geomagnetic disturbance, after a delay of about three days. These results confirm the 'cone-of-avoidance' model for M-regions and reinforce the postulate that high-speed streams in the solar wind originate from coronal holes. Identification of coronal holes from ground-based K-coronal observations corresponds well with those made from EUV and X-ray experiments aboard OSO-7 and Skylab.
Hansen Richard T.
Hansen Shirley F.
Sawyer Constance
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