Sunspots

The short history of the SSN Smoothed Sunspot Number at Luxorion

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

All daily drawings of the sunspot groups and USSPS produced by INAF Catania Astrophysical Observatory ...

The estimated international sunspot number EISN is a daily value obtained by a simple average ...

This page offers radio amateurs experienced and beginners a useful overview and tutorials on HF ...

Monitors the space weather parameters essential for HF radio including SSN SFI Ap Kp X ...

How to understand when a new solar cycle starts At the beginning of a new ...

Nasa MSFC predictions on the behavior of current sunspot cycle.

Space Weather: Real-Time 24hr Effective Sunspot Number

World data center for the sunspot index

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

The Solar Influences Data analysis Center SIDC is a department of the Royal Observatory of ...

The yearly black up to 1750 and monthly red from 1750 up to now sunspot ...

Definition of smoothed sunspot number and R12 index

History, activity, glossary and modern reseach about suspots

The document discusses the classifications of sunspots and their potential for solar flare activity categorizing ...

Comprehensive guide to understanding of solar indices reading this article you will allow a better ...