[Mldxcc] What Does a Sunspot Sound Like?

[Steve Dyer]

For those of you interested with the various undesired noise sources we 
hear on the HF bands and trying to figure if it's natural or man made, 
this is a must listen -- recorded on 21 and 28 mHz yesterday.

http://spaceweather.com/images2013/23oct13/SR_Oct222013_2118ut28.21MHzM4_Ashcraft.mp3

Description currently on the homepage of Spaceweather.com.

73,
Steve
W1SRD