Sunspots

NASA Sunspot Cycle Predictions - Nasa MSFC predictions on the behavior of current sunspot cycle.

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

Real time sunspots number - Space Weather: Real-Time 24hr Effective Sunspot Number

About Sunspot cycles - Theory to explain solar cycles variability proposed by Jean-Pierre Desmoulins

Catania Observatory sunspots data - Daily sun spots data collected by the Catania astrophysical observatory

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.

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

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.

NASA Sunspot Cycle Predictions - Nasa MSFC predictions on the behavior of current sunspot cycle.

Predicted Sunspot Numbers and radio flux - Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center

Real time sunspots number - Space Weather: Real-Time 24hr Effective Sunspot Number

RWC Belgium - World data center for the sunspot index

S marks the spot - Forecasting powerful solar explosions several days in advance now be possible

Solar Flare and sunspots - Understand the connection between solar flares and sunspots.

Solar Region Data - SunSpots - Solar Region Data Current Regions with Sunspots Summary, an useful tool for predictions

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.

Sunspot activity by NASA - Sunspot cycle closely following prediction by Science @ Nasa

Sunspot Number - How sunspot numbers are computed

Sunspot numbers explained - Definition of smoothed sunspot number and R12 index

Sunspots explained - History, activity, glossary and modern reseach about suspots

The Sunspot Cycle - Sunspot Numbers, The Butterfly Diagram, the Greenwich sunspot data and sunspot realted infos.

Understanding Solar Indices - By Ken Larson KJ6RZ, a complete guide to understanding soloar indices and values.