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    • About Sunspot cycles - Theory to explain solar cycles variability proposed by Jean-Pierre Desmoulins
      [Hits: 1611 | Votes: 7 | Rating: 5.28]
    • Catania Observatory sunspots data - Daily sun spots data collected by the Catania astrophysical observatory
      [Hits: 99 | Votes: 0 | Rating: 0.00]
    • IonoProbe - Monitors the space weather parameters essential for HF radio, including SSN/SFI, Ap/Kp, X-ray/Proton flux, and Auroral activity. IonoProbe downloads near-real time satellite and ground station data, stores information for future use and displays it in a user-friendly way.
      [Hits: 1517 | Votes: 11 | Rating: 5.37]
    • Last 30 Days Solar Data - Display a table of last 30 days sunspots reports. Prepared by the U.S. Dept. of Commerce, NOAA, Space Environment Center
      [Hits: 2928 | Votes: 16 | Rating: 8.43]
    • Maunder's Butterfly Diagram - How to understand when a new solar cycle starts. At the beginning of a new solar cycle, sunspots tend to form at high latitudes, but as the cycle reaches a maximum the spots form at lower latitudes.
      [Hits: 527 | Votes: 2 | Rating: 9.00]
    • NASA Sunspot Cycle Predictions - Nasa MSFC predictions on the behavior of current sunspot cycle.
      [Hits: 5731 | Votes: 29 | Rating: 7.51]
    • Predicted Sunspot Numbers and radio flux - Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
      [Hits: 227 | Votes: 2 | Rating: 5.00]
    • Real time sunspots number - Space Weather: Real-Time 24hr Effective Sunspot Number
      [Hits: 3447 | Votes: 21 | Rating: 7.18]
    • RWC Belgium - World data center for the sunspot index
      [Hits: 1023 | Votes: 2 | Rating: 6.50]
    • S marks the spot - Forecasting powerful solar explosions several days in advance now be possible
      [Hits: 988 | Votes: 0 | Rating: 0.00]
    • Solar Flare and sunspots - Understand the connection between solar flares and sunspots.
      [Hits: 1150 | Votes: 2 | Rating: 5.50]
    • Solar Region Data - SunSpots - Solar Region Data Current Regions with Sunspots Summary, an useful tool for predictions
      [Hits: 3515 | Votes: 11 | Rating: 4.91]
    • Spotless days around solar cycle transition - An interesting perspective of the transition from one solar cycle to another is given by exploring the days with no reported sunspots.
      [Hits: 181 | Votes: 0 | Rating: 0.00]
    • Sunspot activity by NASA - Sunspot cycle closely following prediction by Science @ Nasa
      [Hits: 1231 | Votes: 4 | Rating: 5.50]
    • Sunspot Number - How sunspot numbers are computed
      [Hits: 1131 | Votes: 3 | Rating: 5.67]
    • Sunspot numbers explained - Definition of smoothed sunspot number and R12 index
      [Hits: 674 | Votes: 2 | Rating: 4.00]
    • Sunspots explained - History, activity, glossary and modern reseach about suspots
      [Hits: 967 | Votes: 2 | Rating: 3.50]
    • The Sunspot Cycle - Sunspot Numbers, The Butterfly Diagram, the Greenwich sunspot data and sunspot realted infos.
      [Hits: 1551 | Votes: 3 | Rating: 6.67]
    • Understanding Solar Indices - By Ken Larson KJ6RZ, a complete guide to understanding soloar indices and values.
      [Hits: 897 | Votes: 6 | Rating: 9.17]
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