Long term study of the solar filaments from the Synoptic Maps as derived from Hα Spectroheliograms of Kodaikanal Observatory (https://arxiv.org/abs/1707.05658)
Here is new our website from Kislovodsk Mountain Astronomical Station (KMAS) presenting information of daily and archive data: www.observethesun.com
Features to be displayed (e.g., sunspot, filaments, corona, coronal holes etc) could be selected on the left side of solar disk. Moving the mouse over the feature will show detailed information related to that feature.
(from A. Tlatov)
Digitization of Mount Wilson sunspot drawings continues. Un. of Oulu team is working on correcting insets and entering time of drawings. NSO team is preparing the final dataset for online distribution.