The Report and Forecast of Solar and Geophysical Activity is the primary daily report prepared by SEC. It provides a summary and analysis of solar and geomagnetic activity during the previous 24 hours as well as the most recent solar indices. It also provides a forecast of activity and indices for the next 3 days.
This is about Small Antenna types and their properties which can help choosing proper
antenna for high-frequency wireless communications as: two-way radio, microwave short links,
repeaters, radio beacons or wireless telemetry
Global real time ionospheric foF2 map
160 Meter Radio Propagation Prediction Table
High frequecy and VHF radio propagation data, solar and geomagnetic real-time and historic data, sunspot activity reports, as well as forecasts. A comprehensive propagation resource compiled by Tomas Hood, editor of the propagation columns of CQ, CQ VHF, Popular Communications, and Monitoring Times magazines.
Prepared jointly by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center and the U.S. Air Force.
Quick reference table on understanding A K SFI indexes and how can be translated in usable frequency opportunities
Long path hf radio propagation is sometimes the best path to work dx, since the shortest path is not always the best path.
A dynamic collection of high latitude geomagnetic data from 12 Canadian observatories
Solar data with current solar status, forecast and propagation report
Ionospheric Data Archived at NGDC
Online professional-grade high-frequency (3-30 MHz) propagation predictions
These pages provide general propagation advice for HF communicators. Information available includes inferred global propagation conditions, real time HF fadeout coverage charts, regional ionospheric vertical MUF maps and Hourly Area Prediction charts for Astralia and Asia, Europe and North America
Some test circuits using the ACE-HF System Simulation & Visualization software, about reciprocal propagation on HF bands by NW7US
Automatic e-skip and aurora alerts via email or SMS, it sends also latest dxspots via email.
Solar Flux reports, Current Alerts and Warnings from NOAA, 27 day forcast from NOAA, charts reflecting the past 7 years Solar cycle summary charts from NOAA
LDE articles and reports about long delayes radio echoes by DF5AI
NVIS description at tactical-link.com
Broadcast via WWV and WWVH at 18 and 45 minutes past the hour. This message is updated every 3 hours.
Reports current Solar-terrestrial indinces, Solar Flux, A-index, K-Index, forecast for space weather storms.
Prepared by the US Dept. of Commerce, NOAA, Space Environment Center
Summary, tutorial about the basics of what is a waveguide and the basic waveguide theory.