The Monthly Bulletin on Sunspot Activity is issued by Marcel Bissegger and contains the Provisional Swiss Sunspot Group Numbers, the Provisional Swiss Wolf Numbers, the Observer Results and the Predictions made by Dr. Thomas K. Friedli.

 

Current Issue

 

2017

 

January February March April May June July August September October November December

 

2016

 

January February March April May June July August September October November December

 

2015

 

January February March April May June July August September October November December

 

2014

 

January February March April May June July August September October November December

 

2013

 

January February March April May June July August September October November December

 

2012

 

January February March April May June July August September October November December

 

2011

 

January February March April May June July August September October November December

 

2010

 

January February March April May June July August September October November December

 

2009

 

January February March April May June July August September October November December

 

2008

 

January February March April May June July August September October November December

 

2007

 

January February March April May June July August September October November December

 

2006

 

January February March April May June July August September October November December

 

2005

 

January February March April May June July August September October November December

 

2004

 

January February March April May June July August September October November December

 

2003

 

January February March April May June July August September October November December

 

2002

 

January February March April May June July August September October November December

 

2001

 

January February March April May June July August September October November December

 

2000

 

January February March April May June July August September October November December

 

1999

 

January February March April May June July August September October November December

 

1998

 

January February March April May June July August September October November December

 

1997

 

January February March April May June July August September October November December

 

1996

 

January February March April May June July August September October November December