Overview of Solar-Terrestrial Physics Phenomena for the Retrospective World Interval of 20 March - 5 May 1976.

摘要

A summary of the significant solar-terrestrial events that occurred during the Retrospective World Interval of 20 March - 5 May 1976 has been prepared using data available at the present time. Although this period occurred at solar minimum, it was an active interval - one in which the principal events were associated with solar activity in a region at Carrington Longitude approximately 45. (This active center was designated McMath Plage 14143 during solar rotation 1639 and renumbered McMath Plage 14179 during solar rotation 1640). Among the events summarized are the following: (1) solar activity during the period 20-23 March 1976 from a region behind the eastern limb of the sun; (2) a large geomagnetic storm with intense mid-latitude auroral activity on 26 March; (3) moderate solar particle intensities at the Earth from 26 through 31 March; and (4) a ground-level solar cosmic ray event on 30 April having a very hard spectrum. (Author)