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Natural Radio Lab

Natural Radio is the VLF radio emissions that originate terrestrially from lightning and within the earth's magnetosphere through interaction with the Sun. Most of these radio signals, sferics, tweeks, whistlers, chorus and others, occur within the range of human hearing, and can be heard with simple receivers as described on this site.

Natural Radio Lab also looks at Space Weather and Geomagnetic Storms. These are affected by solar activity such as the solar wind, sunspots, solar flares and coronal mass ejections or CMEs. In the popular media, these events are often loosely referred to as "solar storms" or "sun storms".

Please explore this site. I hope you go beyond reading what's here and actually go out and take the opportunity to hear whistlers or the enchanting sounds of the dawn chorus.

Mark Karney, N9JWF
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What are “Tweeks”

naturalradiolab.com Posted on January 29, 2012 by Mark KarneyOctober 21, 2012

Tweeks are sferics where the frequencies have been subject to dispersion by travelling a long distance through the earth-ionosphere waveguide. They have a metallic ringing sound and are usually heard between sunset and sunrise and are more prevalent in the winter.

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