Introduction to High-Frequency Radio and the Ionosphere
Ebor Systems - Training Course - Further Reading
SWS - Other Topics - Introduction to HF Radio Propagation (bom.gov.au)
Radio Fundamentals: An Introduction to HF | Codan Radio Communications (youtube.com) CODAN
Understanding HF Propagation (youtube.com) Rhode & Schwarz
Understanding HF Propagation (youtube.com) Radio Society of Great Britain
The Effects Of The Ionosphere On Radio Wave Propagation (youtube.com) US Army 1950 (vintage B&W)
Ionospheric Radio Propagation : Davies, Kenneth : Free Download, Borrow, and Streaming : Internet Archive The classic HF radio textbook
Understanding NVIS (youtube.com) Rhode & Schwarz (NVIS = Near-Vertical Incidence Skywave for short range HF over terrain)
A Beginner’s Guide to NVIS – Practical Antennas
Near Vertical Incident Skywave (NVIS) Antennas – Practical Antennas
SWS - Section Information - HF Systems Help Page (bom.gov.au)
HF Radio Communications | NOAA / NWS Space Weather Prediction Center
Radio Communications Dashboard | NOAA / NWS Space Weather Prediction Center
Understanding HF Propagation: Predict, Tutorial, Apps, Tools (qsl.net)
NM7M_HF_Propagation_tutorial.pdf (okdxf.eu)
Little Pistol (k9la.us) Guide to HF radio propagation
HF Progagation: The Basics (philpem.me.uk)
SWS - Other Topics - Transequatorial Radio Propagation (bom.gov.au)
Understanding Sporadic E (youtube.com) Rhode & Schwarz
Sporadic E Propagation (youtube.com) (Intro to Ionosphere)
http://ncarc.net/sites/default/files/NCARC-Ionosondes-Feb19.pdf
HF for military use
Webinar: The Rebirth of HF | Rohde & Schwarz (rohde-schwarz.com) (see part 2 from 22m05s. part 1 is an HF overview)
Tactical Communication - The HF Renaissance in the US Army (youtube.com)
Military HF Radio - Episode 1 - RF Theory (youtube.com)
Military HF Radio - Episode 3 - HF NVIS (youtube.com)
Military HF Radio - Episode 5 - HF Antennas (youtube.com)
Military HF Radio - Episode 6 - 2G and 3G ALE (youtube.com)
Space Weather
SWS - Space Weather (bom.gov.au)
SWS - Forecasts - Daily Report (bom.gov.au)
3-Day Forecast | NOAA / NWS Space Weather Prediction Center
Forecast Discussion | NOAA / NWS Space Weather Prediction Center
The Sun
SWS - The Sun and Solar Activity - General Info (bom.gov.au)
SWS - The Sun and Solar Activity - Sunspots (bom.gov.au)
SWS - The Sun and Solar Activity - Solar Cycle (bom.gov.au)
SWS - The Sun and Solar Activity - Solar Flares (bom.gov.au)
NASA SVS | X-Class: A Guide to Solar Flares
Coronal Holes | NOAA / NWS Space Weather Prediction Center
Solar Wind | NOAA / NWS Space Weather Prediction Center
Coronal Mass Ejections | NOAA / NWS Space Weather Prediction Center
Sunspots/Solar Cycle | NOAA / NWS Space Weather Prediction Center
Solar-Stellar Connections | Center for Astrophysics | Harvard & Smithsonian
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