Sunspot Data

• Provisional daily International Sunspot Numbers for last month (updated every first of the month)
• Kalman filter improvement of the monthly Sunspot Number prediction(updated every month)
• Provisional international normalized hemispheric sunspot numbers (updated every first of the month)
• GRAPHICS (updated every first of the month)
• ASCII FILES (updated every first of the month) (See Readme file for explanations)
  • daily sunspot number
  • monthly and monthly smoothed sunspot number
  • yearly sunspot number
  • other data
• Credit and publications using SIDC data

For information : E_mail: Frederic.Clette@oma.be
ROYAL OBSERVATORY OF BELGIUM
Av. Circulaire, 3 - B-1180 BRUSSELS

Last modified: March 28, 2013