The CV-USAF project was established in 2003,
in order to study and compare the work of classifications observed by CV-Helios Network from August 1981 until present
with Joint NOAA/USAF observational data performed from October 1966 until present.
|Complete Sunspotregions 1981-2017||Distribution Classifications||Distribution mvh classifications|
|Sunspotregions >1000 mvh||Listing annual classifications|
|Sunspotregions graphics||Sunspotregions per month|
NOAA/USAF (graphics & tables)
|Sunspotregions' individual frequencies|