太陽黒点活動第23周期の概要

参考文献


NOAA / Space Weather Prediction Center  Space Weather Alerts Archives

NOAA's National Geophysical DataCenter (NGDC):http://www.ngdc.noaa.gov/ngdc.html

SIDC-team, WorldDataCenter for the Sunspot Index, Royal Observatory of Belgium :http://www.sidc.be/sunspot-data/