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Few people know of and even less people
have been fortunate enough or had the
gumption to tune into the beautiful radio
“music” produced naturally by several processes
of nature including lightning storms and aurora,
aided by events occurring on the Sun. I have
been fascinated with listening to naturally-occur-
ring radio signals since about the middle of
1989, hearing my first whistlers almost immedi-
ately after first trying out a rudimentary receiv-
ing apparatus I had put together for the occa-
sion.Whistlers, one of the more frequent natural
radio emissions to be heard, are just one of many
natural radio “sounds” the Earth produces at all
times in one form or another, and these signals
have caught the interest and fascination of a
small but growing number of hobby listeners
and professional researchers for the past four
decades.
“Natural Radio”, a term coined in the late
1980’s by California amateur listener and
researcher Michael Mideke, describes naturally-
occurring electromagnetic (radio) signals ema-
nating from lightning storms, aurora (The
Northern and Southern Lights), and Earth’s mag-
netic-field (the magnetosphere). The majority of
Earth’s natural radio emissions occur in the
extremely-low-frequency and very-low-frequen-
cy (ELF/VLF) radio spectrum specifically, at
AUDIO frequencies between approximately 100
to 10,000 cycles-per second (0.110 kHz). Unlike
sound waves which are vibrations of air mole-
cules that our ears are sensitive to, natural radio
waves are vibrations of electric and magnetic
energy (radio waves) which though occurring at
the same frequencies as sound cannot be lis-
tened to without a fairly simple radio receiver to
convert the natural radio signals directly into
sound.
Whistlers are magnificent sounding bursts of
ELF/VLF radio ener