Spaceweather.com – See the current conditions including solar wind speed and density, sunspot number, solar flux (sfu), an image of the current auroral oval, planetary K index, interplanetary magnetic field, flare forcasts, and much more.
VOCAP (Voice of America Coverage Analysis Program) – A free professional high-frequency (HF) propagation prediction software from NTIA/ITS, originally developed for Voice of America (VOA).
Lowel Digisond Network – See the current digisonde reports from stations around the world, including right here in Alaska. See the critical frequency (f0F2) and MUFs at 100, 200, 400, 600, 800, 1000, 1500, and 3000 km.
NCDXF/IARU International Beacon Project Transmission Schedule – Check this to listen for beacons around the world on 20, 17, 15, 12, and 10 meters.
Reverse Beacon Network – See HF band openings in near-real time. You can see what stations are hearing each other, and even see what stations are hearing you. This system relies on “skimmers” around the world monitoring the HF bands.
Reeve Observatory, Anchorage – See the current magnetogram (updated every 2 minutes) and historical X, Y, and Z components that make up the K-index.
Space Weather Woman – Watch credentialed space weather forcaster Tamitha Mulligan Skov give her take on all things sun! Fascinating!
Listen to Software Defined Radio receivers – Tap into a lengthy list of SDR radios around the world that YOU can control to listen for signals, even YOUR signal.