Radio Waves Below 22 Hz.

This site, started and maintained by Renato Romero, IK1QFK, is the place to find in depth research and technical information on Natural Radio and VLF topics. There are many in-depth technical articles on equipment and reception techniques, as well as reports on various signals and other interesting topics.

http://www.vlf.it/

Stephen P. McGreevy's ground-based ELF-VLF recordings

Stephen has been recording Natural Radio sounds for a long time and probably has the best collection of sounds on the web. He is also the designer and builder of the venerable WR-3 receiver. For easiest access to his recodings go to the University of Iowa site:

http://www-pw.physics.uiowa.edu/mcgreevy/

But there is also a wealth of information on his personal site:

http://www.auroralchorus.com

INSPIRE

The INSPIRE Project, Inc. is a non-profit
scientific, educational corporation whose objective is to bring the
excitement of observing natural and manmade radio waves in the audio
region to high school students.

http://theinspireproject.org/

Longwave Club of America (LWCA)

The Longwave Club of America was organized in January, 1974 to promote monitoring and experimentation on frequencies below the AM broadcast band. Such activities have come to include hearing and identifying navigational beacons, recording and analyzing natural radio emissions at very low frequencies, transmitting under low power rules in the 1750 meter band, and later on other frequencies where such 'Part 15' activity is also permitted.>

http://www.lwca.org/