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Sferics
are
natural
VLF
(
very
low
frequency
)
radio
waves
caused
by
lightning
strikes
in
the
Earth
'
s
athmosphere
.
Alvin
Lucier
describes
 
them
as
"
signals
-
resonant
clicks
and
pops
,
called
tweeks
and
honks
by
scientists
-
[
which
]
occur
in
the
audible
range
of
humans
and
may
 
be
picked
up
by
antennas
and
amplified
for
listening
.
They
are
best
received
at
night
,
far
from
power
lines
.
Oc
­
casionally
,
certain
sferics
 
get
caught
on
and
travel
long
distances
along
the
magnetic
flux
lines
around
the
earth
,
producing
whistlers
,
downward
-
gliding
signals
 
which
may
last
up
to
two
or
three
seconds
." <
br
> <
br
>
We
will
build
long
loop
antennas
and
take
them
on
day
and
night
time
excursions
to
different
locations
around
Berlin
to
listen
to
these
signals
and
other
electromagnetic
waves
. <
br
> <
br
>
The
semester
assignment
includes
creating
an
antenna
and
the
work
on
maps
indicating
sounds
that
were
discovered
along
the
way
.
The
maps
may
serve
as
sound
archives
or
as
scores
for
listening
walks
,
performance
or
story
telling
. <
br
> <
br
>
The
final
presentation
will
take
place
during
the
weekend
of
S4NTP
performances
on
Sunday
June
23
(
to
be
confirmed
). <
br
> <
br
> <
br
>
schedule
: 
ON
FRIDAYS
   <
br
>
first
session
:
May
24
at
12h
in
GRU
111
  <
br
> <
br
>
COURSE
DATES
  <
br
>
MAY
 
24
+
31
 +
JUNE
7
+
14
+
21
<
br
>-
depending
on
weather
forecast
-  <
br
>
2
-
3
day
time
sessions
12
-
16
:
00
  <
br
>
2
-
3
night
time
excursions
22
:
00
-
2am
  <
br
>+
final
presentation
on
Sunday
June
23
(
to
be
confirmed
) <
br
> <
br
>
please
register
via
email
<
br
>
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