Hemispheric Sunspot Numbers 1975-2000

Hemispheric sunspot numbers including the time span from 1975-2000 are presented. The Sunspot Numbers are calculated from sunspot drawings made at the Kanzelhoehe Solar...本数据集涵盖1975年至2000年的半球黑子数（hemispheric sunspot numbers）。该黑子数由坎泽尔霍赫（Kanzelhoehe）太阳观测相关的黑子观测绘图计算所得。