The BAA Solar Section publishes Section members’ observations in a monthly Section newsletter, the main report of which also appears in each edition of the BAA Journal. Monthly figures are also sent by the Section Director to the Royal Observatory in Belgium that incorporates SILSO (Sunspot Index & Long-term Solar Observations), the world data centre for the protection, preservation and dissemination of the International Sunspot Number. Members observations in white light, H-alpha and Calcium K-line are archived and stored in digital format for posterity.
British Astronomical Association
Supporting amateur astronomers since 1890