The Spiral Interplanetary Magnetic Field: A Polarity and Sunspot Cycle Variation.

摘要

Spacecraft observations near the earth of the yearly average direction of the interplanetary magnetic field during the sunspot maximum year 1968showed a deviation from the spiral field of E. N. Parker's classical description. The included angle between the average field direction when the field polarity was away from the sun and the average direction for toward polarity was 168degrees,rather than 180degrees as predicted by Parker. This effect appears to have a sunspot cycle variation. (Author)