Visualizations of medium wave AM broadcaster carriers from data recorded on both sides of the Atlantic Ocean during HamSCI's 2024 Festivals of Eclipse Ionospheric Science

During the April 8, 2024 total solar eclipse across North America and into the Atlantic Ocean, 26 HamSCI volunteers recorded the entire medium wave AM broadcast band (525-1705 kHz) using software defined radios (SDRs), from sites in Canada, the USA, Mexico, the United Kingdom, Portugal and Tunisia.    In addition, many participants made reference recordings of local sunrise and sunset periods on the day of the eclipse, as well as of the eclipse period on another day.

As the eclipse ended in the North Atlantic Ocean, it provided a brief darkness path between North America and Europe / North Africa, resulting in brief appearances of trans-Atlantic medium wave signals on both sides of the ocean.

SDR files from both sides of the Atlantic Ocean have been processed using Carrier Sleuth software, which enabled visualization of the AM broadcasters’ carrier frequencies over time, including any Doppler shift or spectral spreading, plus their signal strengths. These visualization are in the form of 80Hz wide waterfall displays of all broadcast channels, which are spaced at 10kHz intervals across the medium wave band for the Americas, and at 9kHz intervals across the band in the rest of the world . 

The Carrier Sleuth files are available here for download, along with software and introductory documents, describing how those files can be used for a first look at the data sets, as well as instructions for obtaining the raw SDR data.