Introduction
Sunspot Activity Notes
Solar Observing CD-ROM
Disk Drawings
Eclipses of the Sun
Glossary
Hydrogen Alpha
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

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.

2006

2007

2008

2009

2010

Cycle 23

 

 

 

 

 

 

Rotation

                                                        

2079

         17th January 2009 18th January 2009     21st January 2009         26th January 2009 27th January 2009   29th January 2009 30th January 2009   1st February 2009   3rd February 2009 4th February 2009     7th February 2009 8th February 2009  

2080

   11th February 2009 12th February 2009 13th February 2009 14th February 2009         19th February 2009   21st February 2009             28th February 2009   2nd March 2009     5th March 2009 6th March 2009 7th March 2009 8th March 2009

2081

 9th March 2009 10th March 2009 11th March 2009     14th March 2009 15th March 2009 16th March 2009 17th March 2009 18th March 2009   20th March 2009 21st March 2009 22nd March 2009           28th March 2009 29th March 2009 30th March 2009   1st April 2009 2nd April 2009 3rd April 2009    

2082

   6th April 2009 7th April 2009 8th April 2009   10th April 2009     13th April 2009   15th April 2009     18th April 2009 19th April 2009 20th April 2009 21st April 2009 22nd April 2009 23rd April 2009 24th April 2009 25th April 2009 26th April 2009 27th April 2009 28th April 2009 29th April 2009   1st May 2009 2nd May 2009

2083

 3rd May 2009   5th May 2009 6th May 2009   8th May 2009 9th May 2009 10th May 2009 11th May 2009 12th May 2009     15th May 2009 16th May 2009 17th May 2009       21st May 2009 22nd May 2009 23rd May 2009 24th May 2009 25th May 2009 26th May 2009 27th May 2009 28th May 2009 29th May 2009 30th May 2009

2084

 31st May 2009 1st June 2009 2nd June 2009   4th June 2009     7th June 2009       11th June 2009 12th June 2009   14th June 2009 15th June 2009 16th June 2009   18th June 2009 19th June 2009   21st June 2009   23rd June 2009 24th June 2009 25th June 2009    

2085

 26th June 2009   28th June 2009 29th June 2009 30th June 2009 1st July 2009 2nd July 2009 3rd July 2009 4th July 2009 5th July 2009 6th July 2009     9th July 2009 10th July 2009 11th July 2009 12th July 2009 13th July 2009 14th July 2009 15th July 2009 16th July 2009   18th July 2009   20th July 2009   22nd July 2009  

2086

 23rd July 2009 24th July 2009     27th July 2009 28th July 2009   30th July 2009 31st July 2009   2nd August 2009 3rd August 2009   5th August 2009 6th August 2009   8th August 2009 9th August 2009 10th August 2009 11th August 2009 12th August 2009 13th August 2009 14th August 2009          

2087

     22nd August 2009 23rd August 2009 24th August 2009 25th August 2009   27th August 2009 28th August 2009 29th August 2009 30th August 2009 31st August 2009   2nd September 2009 3rd September 2009 4th September 2009 5th September 2009 6th September 2009   8th September 2009   10th September 2009   12th September 2009   14th September 2009    

2088

 16th September 2009   18th September 2009 19th September 2009 20th September 2009 21st September 2009 22nd September 2009   24th September 2009 25th September 2009 26th September 2009 27th September 2009   29th September 2009                            

2089

                                                        

2090

                                                        

2091

                                                        

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Page created on 21 December 2008.