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Sunspot numbers derived from individual drawings are shown below in the form of a colour table from blue through to red via green and yellow. A sunspot number of 0 is , a sunspot number of 50 is , a sunspot number of 100 is , a sunspot number of 150 is while a sunspot number of 200 or more is . The numbers are given for each solar rotation so that active longitudes can be identified. Dates can be seen by placing the mouse icon over each coloured square.

Rotation

                                                        

1945

           17th January 1999       21st January 1999 22nd January 1999 23th January 1999                             7th February 1999  

1946

           13th February 1999             20th February 1999     23rd February 1999       27th February 1999 28th February 1999              

1947

       10th March 1999   12th March 1999 13th March 1999 14th March 1999 15th March 1999 16th March 1999 17th March 1999 18th March 1999   20th March 1999 21st March 1999 22nd March 1999 23rd March 1999   25th March 1999   27th March 1999 28th March 1999     31st March 1999 1st April 1999 2nd April 1999  

1948

 4th April 1999   6th April 1999   8th April 1999 9th April 1999     12th April 1999   14th April 1999 15th April 1999 16th April 1999 17th April 1999 18th April 1999 19th April 1999     22th April 1999     25th April 1999   27th April 1999     30th April 1999  

1949

 1st May 1999 2nd May 1999 3rd May 1999     6th May 1999   8th May 1999 9th May 1999 10th May 1999 11th May 1999 12th May 1999   14th May 1999 15th May 1999 16th May 1999 17th May 1999   19th May 1999 20th May 1999 21th May 1999 22nd May 1999            

1950

         1st June 1999       5th June 1999 6th June 1999   8th June 1999 9th June 1999 10th June 1999     13th June 1999 14th June 1999 15th June 1999 16th June 1999 17th June 1999 18th June 1999 19th June 1999 20th June 1999 21st June 1999 22nd June 1999    

1951

 24th June 1999                           8th July 1999 9th July 1999 10th July 1999 11th July 1999 12th July 1999 13th July 1999 14th July 1999   16th July 1999 17th July 1999 18th July 1999 19th July 1999    

1952

     23rd July 1999 24th July 1999 25th July 1999 26th July 1999 27th July 1999 28th July 1999 29th July 1999 30th July 1999 31st July 1999 1st August 1999 2nd August 1999   4th August 1999 5th August 1999 6th August 1999 7th August 1999 8th August 1999   10th August 1999   12th August 1999   14th August 1999 15th August 1999 16th August 1999  

1953

 18th August 1999 19th August 1999 20th August 1999 21st August 1999 22nd August 1999 23rd August 1999     26th August 1999 27th August 1999 28th August 1999   30th August 1999 31st August 1999 1st September 1999 2nd September 1999 3rd September 1999 4th September 1999 5th September 1999 6th September 1999   8th September 1999   10th September 1999 11th September 1999   12th September 1999  

1954

       17th September 1999 18th September 1999           24th September 1999 25th September 1999 26th September 1999   28th September 1999       2nd October 1999 3rd October 1999 4th October 1999 5th October 1999 6th October 1999       10th October 1999  

1955

 11th October 1999 12th October 1999 13th October 1999 14th October 1999   16th October 1999 17th October 1999 18th October 1999 19th October 1999                       31st October 1999           6th November 1999  

1956

 7th November 1999           13th November 1999         18th November 1999     21st November 1999           27th November 1999 28th November 1999     1st December 1999 2nd December 1999   4th December 1999

1957

 5th December 1999       9th December 1999 10th December 1999                 19th December 1999 20th December 1999     23rd December 1999     26th December 1999   28th December 1999        

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Last updated on 22 December 2002.