Introduction
Sunspot Activity Notes
Solar Observing CD-ROM
Sunspot Development
Disk Animations
Disk Drawings
Eclipses of the Sun
Glossary
Hydrogen Alpha
Latest Disk Animation
Latest Disk Drawing
Sunspot Measurements
Observing the Sun
Parallactic Angle
Software
Solar Books
Stonyhurst Disks
The Sun as viewed from the Earth
Sunspot Area
Sunspot Location
Sunspot Numbers
Sunspot Trends
Transits
Useful Links
What's New

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

                                                      

1972

 17th January 2001 18th January 2001           24th January 2001 25th January 2001   27th January 2001 28th January 2001                   7th February 2001   9th February 2001        

1973

 13th February 2001 14th February 2001     17th February 2001 18th February 2001   20th February 2001     23rd February 2001 24th February 2001 25th February 2001               5th March 2001             12th March 2001

1974

   14th March 2001 15th March 2001       19th March 2001                   29th March 2001 30th March 2001               7th April 2001 8th April 2001  

1975

 9th April 2001   11th April 2001   13th April 2001       17th April 2001 18th April 2001 19th April 2001 20th April 2001 21st April 2001 22nd April 2001 23rd April 2001     26th April 2001   28th April 2001       2nd May 2001 3rd May 2001 4th May 2001 5th May 2001  

1976

 6th May 2001 7th May 2001 8th May 2001   10th May 2001 11th May 2001 12th May 2001 13th May 2001   15th May 2001       19th May 2001 20th May 2001 21st May 2001 22nd May 2001 23rd May 2001 23rd May 2001 25th May 2001 26th May 2001 27th May 2001 28th May 2001 29th May 2001 30th May 2001 31st May 2001 1st June 2001  

1977

 2nd June 2001 3rd June 2001 4th June 2001 5th June 2001   7th June 2001 8th June 2001 9th June 2001   11th June 2001   13th June 2001 14th June 2001 15th June 2001     18th June 2001 19th June 2001 20th June 2001 21st June 2001 22nd June 2001 23rd June 2001 24th June 2001 25th June 2001 26th June 2001 27th June 2001 28th June 2001  

1978

 30th June 2001 1st July 2001 2nd July 2001 3rd July 2001 4th July 2001 5th July 2001     8th July 2001       12th July 2001   14th July 2001 16th July 2001       20th July 2001 21st July 2001   23rd July 2001        

1979

                   5th August 2001   7th August 2001   9th August 2001 10th August 2001 11th August 2001       15th August 2001         20th August 2001 21st August 2001 22nd August 2001  

1980

   24th August 2001 25th August 2001   27th August 2001 28th August 2001 29th August 2001   31st August 2001 1st September 2001 2nd September 2001 3rd September 2001 4th September 2001 5th September 2001       9th September 2001         14th September 2001 15th September 2001 16th September 2001 17th September 2001    

1981

   20th September 2001 21st September 2001             28th September 2001             5th October 2001 6th October 2001 7th October 2001         12th October 2001 13th October 2001      

1982

 17th October 2001         22nd October 2001 23rd October 2001         28th October 2001   30th October 2001 31st October 2001 1st November 2001 2nd November 2001 3rd November 2001 4th November 2001 5th November 2001         10th November 2001      

1983

 13th November 2001 14th November 2001 15th November 2001                     26th November 2001         1st December 2001     4th December 2001   6th December 2001 7th December 2001      

1984

 10th December 2001 11th December 2001     14th December 2001           20th December 2001   22nd December 2001 23rd December 2001     26th December 2001   28th December 2001     31st December 2001 1st January 2002 2nd January 2002 3rd January 2002 4th January 2002    

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Last updated on 22 December 2002.