Contains:  Solar system body or event
AR 2975 - 2976 - 2984, 



    
        

             Astroavani - Avani Soares

AR 2975 - 2976 - 2984

Acquisition type: Lucky imaging
AR 2975 - 2976 - 2984, 



    
        

             Astroavani - Avani Soares

AR 2975 - 2976 - 2984

Acquisition type: Lucky imaging

Acquisition details

Resolution: 1464x1924

File size: 2.1 MB

Data source: Backyard

Description

Sunspot numbers are assigned by the Space Environment Center, which is part of the National Oceanic and Atmospheric Administration (NOAA). The groups of spots are numbered sequentially as they are identified. If a group goes around the Sun completely and appears on the other side, it receives a new number.

The numbering began in the 1960s by solar physicist Pat McIntosh. Sometime in 1970 it started counting up again from scratch. Current numbering began on January 5, 1972. What is effectively numbered is not individual spots but groups of spots or active regions on the Sun which may contain several spots. Before being given the number the region must be identified by at least two different observatories.

Comments

Histogram

AR 2975 - 2976 - 2984, 



    
        

             Astroavani - Avani Soares