<s>
DSCOVR	O
was	O
originally	O
proposed	O
as	O
an	O
Earth	O
observation	O
spacecraft	O
positioned	O
at	O
the	O
Sun-Earth	O
Lagrange	B-Application
point	I-Application
,	O
providing	O
live	O
video	O
of	O
the	O
sunlit	O
side	O
of	O
the	O
planet	O
through	O
the	O
Internet	O
as	O
well	O
as	O
scientific	O
instruments	O
to	O
study	O
climate	O
change	O
.	O
</s>
<s>
DSCOVR	O
began	O
as	O
a	O
proposal	O
in	O
1998	O
by	O
then-Vice	O
President	O
Al	O
Gore	O
for	O
the	O
purpose	O
of	O
whole-Earth	O
observation	O
at	O
the	O
Sun-Earth	O
Lagrange	B-Application
point	I-Application
,	O
from	O
Earth	O
.	O
</s>
<s>
The	O
scientific	O
goals	O
expanded	O
to	O
measure	O
the	O
amount	O
of	O
solar	O
energy	O
reaching	O
Earth	O
,	O
cloud	O
patterns	O
,	O
weather	O
systems	O
,	O
monitor	O
the	O
health	O
of	O
Earth	O
's	O
vegetation	O
,	O
and	O
track	O
the	O
amount	O
of	O
UV	B-Application
light	O
reaching	O
the	O
surface	O
through	O
the	O
ozone	O
layer	O
.	O
</s>
<s>
The	O
main	O
science	O
instrument	O
sets	O
are	O
the	O
Sun-observing	O
Plasma	O
Magnetometer	O
(	O
PlasMag	O
)	O
and	O
the	O
Earth-observing	O
NIST	O
Advanced	O
Radiometer	O
(	O
NISTAR	O
)	O
and	O
Earth	B-Algorithm
Polychromatic	I-Algorithm
Imaging	I-Algorithm
Camera	I-Algorithm
(	O
EPIC	O
)	O
.	O
</s>
<s>
The	O
spacecraft	O
is	O
in	O
a	O
looping	O
halo	O
orbit	O
around	O
the	O
Sun-Earth	O
Lagrange	B-Application
point	I-Application
L1	I-Application
in	O
a	O
six-month	O
period	O
,	O
with	O
a	O
spacecraft	O
–	O
Earth	O
–	O
Sun	O
angle	O
varying	O
from	O
4°	O
to	O
15°	O
.	O
</s>
<s>
The	O
Earth	B-Algorithm
Polychromatic	I-Algorithm
Imaging	I-Algorithm
Camera	I-Algorithm
(	O
EPIC	O
)	O
takes	O
images	O
of	O
the	O
sunlit	O
side	O
of	O
Earth	O
for	O
various	O
Earth	O
science	O
monitoring	O
purposes	O
in	O
ten	O
different	O
channels	O
from	O
ultraviolet	B-Application
to	O
near-infrared	O
.	O
</s>
<s>
It	O
took	O
DSCOVR	O
110	O
days	O
from	O
when	O
it	O
left	O
Cape	O
Canaveral	O
Air	O
Force	O
Station	O
(	O
CCAFS	O
)	O
,	O
Florida	O
,	O
to	O
reach	O
its	O
target	O
destination	O
away	O
from	O
Earth	O
at	O
the	O
Sun-Earth	O
L1	O
Lagrange	B-Application
point	I-Application
.	O
</s>
<s>
DSCOVR	O
was	O
placed	O
in	O
operation	O
at	O
the	O
L1	O
Lagrange	B-Application
point	I-Application
to	O
monitor	O
the	O
Sun	O
,	O
because	O
the	O
constant	O
stream	O
of	O
particles	O
from	O
the	O
Sun	O
(	O
the	O
solar	O
wind	O
)	O
reaches	O
L1	O
about	O
60	O
minutes	O
before	O
reaching	O
Earth	O
.	O
</s>
