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Presents a web-based DX cluster interface, F5LEN Webcluster, which functions as a member node within the broader European DX Cluster network. It displays current DX spots across a wide range of amateur radio bands, from VLF through SHF, including specific bands like 1.8 MHz, 144 MHz, and 10 GHz, as well as satellite operations on QO-100. The service offers filtering options for various modes and activities, such as CW, QRP, IOTA, and specific VHF/UHF bands. Operators can access real-time propagation data, including Solar Flux Index (SFI), Sunspot Number (SSN), Kp index, and Auroral activity (Au), alongside tools for solar forecasts and tropospheric ducting predictions. The platform facilitates DX spotting by providing a centralized point for sharing and viewing contact information, aiding in DX hunting and contest operations. It also includes links to an Atlas, Sun tools, and a mobile version for portable access.

Display solar activity forecast for next 27 days, display A-index, Sunspot Numbers and Flux forecast including graphs for solar activity and geomagnetic forecast. All forecasts are updated daily.

DX Propagation by DR2W! High resolution SNR maps in pseudo color. Propagation based on the actual sunspot number.

Definition of smoothed sunspot number and R12 index

The short history of the SSN Smoothed Sunspot Number at Luxorion

Real-time solar activity page at SpaceWeatherLive.com display sunspot regions, indicating sunspot numbers of with manitude class, Solar Flares and a list of daily events on the sun.

A dynamic graph of current and past solar cycle sunspot number progression and F10.7 cm radio flux progression. In both plots, the black line represents the monthly averaged data and the purple line represents a 13-month weighted, smoothed version of the monthly averaged data.

The yearly, black, up to 1750, and monthly red, from 1750 up to now, sunspot numbers provided by the Royal Observatory of Belgium SILSO

Predicted Solar Cycle: Sunspot Number And Radio Flux Values with Expected Ranges, sources are Penticton, B.C., Canada, S.I.D.C. Brussels

The estimated international sunspot number (EISN) is a daily value obtained by a simple average over available sunspot counts from prompt stations in the SILSO network.