Green coronal line intensity and geomagnetism

Abstract

Climax Observatory spectograms of the green coronal line, λ5303, for the period 1942–1944 near solar activity minimum have recently been remeasured. Analysis of these revised intensities indicates that the most consistent feature in the relation of green line intensity to geomagnetism is a minimum in geomagnetic activity following central meridian passage (CMP) of regions of high green line intensity. This effect may be interpreted as a result of the tendency of solar activity regions to coincide with regions of high green line intensity and to avoid M regions. In the period October 1953 to October 1954, at sunspot minimum, no relation appeared between green line intensity and geomagnetic activity.