Solar Cycle 23

If the value of the daily flare index is lower then 10 during the month, the color of that month is green.
If the value of the daily flare index exceeds 20 once, then the color of that month is yellow.
If the value of the daily flare index exceeds 40 once, then the color of that month is red.

 

  1996    1997    1998     1999    2000    2001    2002    2003    2004    2005  2006 2007
  JAN   JAN   JAN   JAN   JAN   JAN   JAN   JAN   JAN   JAN JAN JAN
  FEB   FEB   FEB   FEB   FEB   FEB   FEB   FEB   FEB   FEB FEB FEB
  MAR   MAR   MAR   MAR   MAR   MAR   MAR MAR   MAR   MAR MAR MAR
  APR   APR   APR   APR   APR   APR   APR   APR   APR   APR APR APR
  MAY   MAY   MAY   MAY   MAY   MAY   MAY   MAY   MAY   MAY MAY MAY
 JUN   JUN   JUN   JUN   JUN   JUN   JUN   JUN   JUN   JUN JUN JUN
  JUL   JUL   JUL   JUL   JUL   JUL   JUL   JUL   JUL   JUL JUL JUL
  AUG   AUG   AUG   AUG   AUG   AUG   AUG   AUG   AUG   AUG AUG AUG
 SEP   SEP   SEP   SEP   SEP   SEP   SEP   SEP   SEP   SEP SEP SEP
  OCT   OCT   OCT   OCT   OCT   OCT   OCT   OCT   OCT   OCT OCT OCT
  NOV   NOV   NOV   NOV   NOV   NOV   NOV   NOV   NOV   NOV NOV NOV
  DEC   DEC   DEC   DEC   DEC   DEC   DEC   DEC   DEC   DEC DEC DEC

 

Flare Index Data 1976-2018 (catalog.rar)

 

  • Solar flares which are the most energetic explosions in the solar system have a direct effect on the Earth's atmosphere. 
    A solar flare is defined as an enormous explosion which is observed as a sudden, rapid, and intense variation in brightness in the solar atmosphere. It is believed to result from the sudden release of energy stored in the magnetic fields that thread the solar corona in active regions around sunspots involving sudden bursts of particle acceleration, pleasma heating, and bulk mass motion. The Earth's upper atmosphere becomes more ionized and expands. Long distance radio signals can be disrupted by the resulting change in the Earth's ionosphere. A satellite's orbit around the Earth can be disturbed by the enhanced drag on the satellite from the expanded atmosphere. Satellite's electronic components can be damaged. So a flare index is needed to study all the probable solar activities which affect  our satellite environment and Earth atmosphere. FLARE INDEX is one of the best indicators of activity variations on the chromosphere. This feature makes the flare index a suitable full-disk solar index for comparison with similar solar indices which reflect diff