3 ms·

Here are the first (1947) and last (1996) observations that are digitized. The last, one the spots are very faint, in the lower-right-hand side of the Sun. 1.

Here are the first (1947) and last (1996) observations that are digitized. The last, one the spots are very faint, in the lower-right-hand side of the Sun. 1. https://www.kahaku.go.jp/research/db/science_engineering/sunspot/sketch/47/2kimg/s2k_j_470122.jpg https://www.kahaku.go.jp/research/db/science_engineering/sun... 2. https://www.kahaku.go.jp/research/db/science_engineering/sunspot/sketch/96/2kimg/s2k_j_961231.jpg https://www.kahaku.go.jp/research/db/science_engineering/sun...

mturmon 7y ago
Here is a movie of automatically-identified active regions covering 1996, as a comparative: http://jsoc.stanford.edu/data/mdi/mdi-tarp/mdi-browse/ql-mtarp/harp.mdi.fd_Marmask_1996.114_TAI_253d_mask.mp4 http://jsoc.stanford.edu/data/mdi/mdi-tarp/mdi-browse/ql-mta... This movie was made from the science data products, but it's just a browse product for convenience. See also: http://jsoc.stanford.edu/data/mdi/mdi-tarp/mdi-synoptic/ http://jsoc.stanford.edu/data/mdi/mdi-tarp/mdi-synoptic/ 1996/12/31 is in Carrington Rotation number 1917.