• NCSIDO - Northern Colorado Sudden Ionospheric Disturbance Observatory (Colorado, USA) Station description and real-time measurements | ![http://xtrsystems.com/vlf/](icones/icon_www.png) |
• Moore Observatory VLF Monitor (Kentucky, USA) John Kielkopf's station with access to real-time measurements of NAA 24kHz | ![http://moondog.astro.louisville.edu/](icones/icon_www.png) |
• Kiel Longwave
Monitor (Germany) Peter Wilhelm Schnoor's station with access to real-time broadband VLF spectrograms | ![http://www.df3lp.de/](icones/icon_www.png) |
• SID-GRB@home, David Saum's station tuned to the 24kHz NAA transmitter | ![http://www.infiltec.com/SID-GRB@home/GrbSid.png](icones/icon_www.png) |
• Station of Ernst D. Schmitter, Germany, with two VLF receivers 40km apart and a magnetometer | ![http://www.electricterra.com/Ernst/](icones/icon_www.png) |