All language subtitles for 5E89400DF15150110EA667F6C0E174F7_eng

- It rises in the east, and
bathes our planet in light.

It powers the machinery
of nature, our weather,

encourages and sustains
life on land and at sea,

where it warms our
oceans from pole to pole.

When it sets in the west, it
reveals to us its many billions

of sibling stars,
populating the night sky.

We study our sun closely,
and like a Rosetta Stone,

it can reveal the secrets
of all the other stars.

You cannot study the sun in isolation.

The influence of its power
throughout the solar system

it created is persuasive and dominating.

The heliosphere is an
immense magnetic bubble

extending beyond the orbit of Pluto.

It contains the solar
wind of high and low speed

energetic particles and
plasma that originate

at the surface of the sun.

After traveling for 36 years
and 19 billion kilometers,

the Voyager 1 spacecraft has reached

the edge of this heliosphere.

- Voyager 1 has left the
bubble around the sun

and entered interstellar
space, the space between stars.

- There, it still senses the shock waves

emittted by the sun,
which sound like this.

To understand this source
of power and its influences,

scientists conduct
observations from the ground

and in space, where a
flotilla of satellites

train sophisticated sensors upon the sun

and the space weather it creates.

- Space weather is the field that studies

how what's going on on the sun affects us

here on the Earth, in our
near space environment,

and on the space environment
on other planets.

The effects of space
weather are so complicated

because we have to
understand what's going on

at the sun, as well as
all that stuff traveling

through interplanetary
space, how that affects us

here on the Earth, and
throughout the heliosphere,

that we need an entire
fleet of instruments

to look at these various effects.

It's basically a system
science, so you understand

one part of it in order to
understand the other part of it,

and you have to put that
whole puzzle together

to understand the full
effects of space weather.

- GOES-P is an ongoing
series of Earth observation

satellites that happen to keep
a constant eye on the sun,

monitoring this space weather.

- When the spacecraft's sitting in space,

looking down at the Earth,
and it stays stationary

like this, but the solar
array out here moves

and tracks the sun, so
that way it's always

looking at the sun and can
take a scan every minute.

- The sun's outer atmosphere
is constantly being

heated up by the solar surface,
and this causes particles

from the sun's atmosphere
to stream away constantly.

These streaming particles,
which are filling our entire

solar system are called the solar wind.

- Different phenomenon from the sun

is constantly bombarding the Earth.

Although you might not
know it, the solar weather

affects you every day down here as well,

and not only just astronauts,
it affects people on Earth.

- The latest generation of
GOES satellite is the GOES-R,

soon to be launched into orbit.

Other low Earth orbiting platforms include

ESA's microsatellite Proba
2 testing new technology

and Pika sponsored by CNES,
the French space agency.

Hinode is the Japanese word for sunrise.

It is a joint mission
between JAXA, NASA, and ESA

to study the sun's magnetic cycles.

Its close up study has revealed

the complex granular textures
of the sun's surface,

and insights into solar flares.

- A solar flare is a
huge release of energy

that converts the
magnetic energy of the sun

into heat, into light,
it accelerates particles,

and can really heat up the plasma in order

of minutes to over 60 million kelvin.

- For a large eruption, the sun produces

a flash of light which
we call the solar flare.

It also produces a huge ball of material

traveling away from the sun we
call a coronal mass ejection,

and both of those phenomena can accelerate

subatomic particles which we
call solar energetic particles.

These three things together
make up a solar storm.

- To study the solar wind phenomenon,

a group of satellites were
placed in a unique orbit

between Earth and the
sun at what is called L1,

or Legrange point 1, a point
of gravitational balance

between the Earth and the sun.

The Advanced Composition Explorer, or ACE,

observes energetic solar particles,

Wind studies radio waves
and plasma that occur

in the solar wind and in
the Earth's magnetosphere,

and SOHO the Solar and
Heliospheric Observatory.

- Using SOHO and using technique
called helioseismology,

very similar to seismology on the Earth,

we're actually able to see inside the sun.

And so what we were able
to do is see the layer

of the sun just below the visible surface

that we call the convection zone,

and that's where all sorts
of dynamics are going on

the inside of the sun is
bubbling up to the surface,

and that's really where
all of the solar phenomena

that we see is first developed.

And so we were able to see
underneath the surface,

and see these flows of solar plasma,

see the formation of sun spots.

This is something that's
never been done before,

we're actually able to see
the details inside of a star.

- Another high resolution
space telescope was TRACE.

- Using details of the coronal loops,

in the previous images you
would, from other satellites,

it would look like it
was just one big loop,

and when you actually get to see TRACE,

you can see it's all
these teeny tiny finely,

they almost look like threads,

and there's these teeny tiny loops,

and they're just breaking
off and reforming,

and throwing plasma.

- Using x-ray and gamma
ray solar flare imaging,

RISI explores the particle
physics behind solar flares.

Another event subjecting the
solar system to bombardment

is the CME, or coronal
mass ejection event.

- A coronal mass ejection,
or CME, is an eruption

of plasma from the sun
that shoots out into space,

and it could affect us here at Earth

if that big ball of plasma were to hit us.

- NASA's twin stereo
mission has one spacecraft

orbit the sun ahead of the
Earth, and the other behind,

providing a stereoscopic view of the sun

to better understand these
coronal mass ejections,

and the energetic particles of plasma.

- Solar energetic particles
are particles of plasma

that are accelerated at the flare site

from the energy that's
released in the flare,

and these particles can
be accelerated up to

almost 80% of the speed of light.

- A coronal mass ejection,
when it's traveling so fast

creates a shock, and that can create

solar energetic particles.

- In 2009, NASA commenced
a new scientific program

called Living With A Star.

The crown jewel of this program

is the solar dynamics observatory or SDO,

the most advanced spacecraft ever designed

to study the sun and its dynamic behavior.

The program's goal is to develop

the scientific understanding
necessary to address those

aspects of the sun that directly
affect us here on Earth.

The spacecraft provides 16 megapixel,

ultra high definition imagery of the sun

in 13 different wavelengths.

From extreme ultraviolet frequencies

to the helioseismic and
the magnetic imager,

and the atmospheric imaging assembly,

each wavelength was selected
to highlight a particular

part of the sun's atmosphere.

The results are stunning.

They reveal fine details
from the solar surface,

to the upper reaches of the sun's corona.

These solar events dwarf our planet,

and the science has
brought a renewed focus

back to Earth's protective magnetic field.

- We are protected here on
the surface of the Earth

from solar flares and
coronal mass ejections

when they impact the Earth,
due to the magnetic field

of the Earth called the magnetosphere,

which deflects the magnetic field

and the energetic particles,
as well as the atmosphere,

which absorbs the higher
levels of radiation.

- Fortunately we are
protected here at Earth

from flares and coronal mass ejections

by the Earth's outer atmosphere.

It absorbs a lot of the energy
from the increased light

from solar flares, but
we're also protected

by the magnetic field.

You know the Earth has a
North Pole and a South Pole,

anyone that had a compass knows that,

but this magnetic field of
the Earth also protects us

from these charged particles,
the plasma coming from

coronal mass ejections.

It largely deflects a lot
of this direct energy.

A coronal mass ejection
will come and effect

the Earth's magnetic field,
and changing and hitting

the Earth's magnetic
field causes other changes

on the far side away from the
Earth that then accelerates

more particles and shoots
those particles into

the North and South
Pole that produce these

very beautiful waves of
green and blue and red

that are just lovely to see.

- The sun is powered by
a process called fusion,

and that happens at the
very core of the sun,

where it is so intense,
so hot, and so dense

that protons fuse together
and create helium.

And this process fuels the
sun and creates energy.

- As the energy moves outward
boosted by magnetic fields,

the temperature drops.

- Up until that point,
everything makes sense

in that the hottest part is in the middle

and everything gets gradually
cooler as you move away,

but then something very
interesting starts to happen,

which is that it starts
to get hotter again.

- This layer, where the
temperature begins to rise again,

is called the chromosphere.

It lies between the
photosphere and the corona,

which is the hottest part
of the sun's atmosphere.

To discover how this corona is powered,

another mission called
IRIS was launched in 2013.

IRIS carries a single
ultraviolet telescope

and imaging spectrograph,
whose tight resolution

allows it to see features
as small as 240 kilometers

on the sun's surface.

IRIS's first images
showed a multitude of thin

fibrile-like structures that
have never been seen before,

revealing enormous contrasts
in density and temperature

occurring throughout the region.

- The light from the chromosphere

is difficult to interpret
because of the complicated

interaction that the
light has with the matter,

bounces around if you
will, many times before

it's finally bounced towards us,

and this means that
that interaction between

light and matter needs to
be modeled in great detail,

due to not just advances
in computational power

of computers, but in the
computational techniques

that have been developed by the IRIS team.

We are in a position to do this.

- Data collected from the IRIS spacecraft

has shown that the
interface region of the sun

is significantly more complex
than previously known.

- Although the corona is extremely hot,

millions of degrees,
it's at a low density,

so it doesn't actually
take a lot of energy

to heat it to that temperature.

The chromosphere on the other hand

is a much higher density, while being at

lower temperature, and there's
much more energy deposited

in the chromosphere than the corona.

So that a tiny fraction of
that energy in the chromosphere

escaping into the corona,
is plenty to power

all of the processes that we see

from heating to such extreme temperatures

to driving the solar wind that
fills the whole solar system

impacting all the planets,
including our own.

We hope to better
understand these fascinating

and important processes with IRIS.

- This energy streaming
from the sun causes

other narcan effects on the
planets of the solar system.

- The northern lights are
particles that are being shot into

the North Pole and the South Pole,

that produce these beautiful
greens and blues and reds.

They're not direct particles from the sun.

A coronal mass ejection
will come and affect

the Earth's magnetic field,
and changing and hitting

the Earth's magnetic
field causes other changes

on the far side away from the Earth,

that then accelerates more particles

and shoots those particles then into the

North and South Pole that produce

these very beautiful waves
of green and blue and red

that are just lovely to see.

- Armed with more questions
about the solar wind

and energetic particles, NASA launched

a pair of probes into Earth orbit.

Named after the famous
scientist who discovered

the radiation belt surrounding our planet,

the Van Allen probes
were dispatched to study

the radiation phenomenon
and the magnetic fields

around the Earth in greater detail.

- During the course of
geomagnetic activity,

disturbances caused by flares on the sun,

by big blobs of plasma
coming out from the sun

towards the Earth, the
Earth's magnetic field

is battered and shaken.

Some of that energy is
captured in the Earth's

magnetic field, and through
a variety of processes

that energy energizes particles
in the Earth radiation belts

up to energies that are hazardous

to spacecraft and astronauts.

The two spacecraft are
focused on the dynamic

radiation belts in the
Earth's inner magnetosphere.

They're the only spacecraft
that focus on those,

consequently they're a critical component

in the series of phenomena
that link the sun to the Earth.

- Solar flares and CMEs are all driven

by magnetic reconnection,

this is where the sun churns
up the magnetic field,

that's inherent in it, and then it causes

oppositely directed magnetic
fields to then annihilate.

But you can't just get rid
of magnetic, you can't just

get rid of energy, you
have to convert the energy

and transfer energy into
other things such as

plasma motions, accelerating the plasma,

heating up the plasma, and
also giving out more light.

- We are protected here on
the surface of the Earth

from solar flares and
coronal mass ejections

when they impact the Earth,
due to the magnetic field

of the Earth called the magnetosphere,

which deflects the magnetic field and

the energetic particles
as well as the atmosphere

which absorbs the higher
levels of radiation.

- But this magnetic field of
the Earth also protects us

from these charged particles,
the plasma coming from

coronal mass ejections,
it largely deflects a lot

of this direct energy.

- The phenomenon of magnetic reconnection

is not well understood,
so NASA has launched

a multi-satellite mission called MMS

to try to unlock the secrets
of our magnetic field.

- The MMS mission is a
mission consisting of

four spacecraft, which will
fly in close constellation

to measure a process called
magnetic reconnection.

- The universe is full of plasma,

and it's full of magnetic fields,

and all over the place in the universe

you have one plasma
colliding with another.

An example of that is
the solar wind coming in

and colliding with Earth's magnetosphere.

And then the magnetic
energy in the plasma,

some fraction of that
magnetic energy is converted

very rapidly into plasma energy.

So you can think of it as kind
of like a magnetic explosion.

And the reason this is
important is because

these explosions drive a
lot of the weather patterns

that we see in the magnetosphere,

so what space scientists like
to refer to as space weather.

These space weather
phenomena can have impact

on our everyday lives,
it can actually affect

communication satellites, the power grid,

so we'd really like to understand how

these magnetic explosions work.

- We need to measure reconnection
in more than one location.

We need to measure it in,
basically, how it varies in space,

how it varies in all
three spacial dimensions,

and that requires the tetrohedra.

The additional, fantastic
benefit that that provides

is that it will actually
enable us to recognize

that we are looking within
a reconnecting region

much easier than a single spacecraft.

- The ideal situation
is that we would like

the four spacecraft to
kind of be surrounding

this region where the
explosion is happening,

so the separation of the spacecraft

is about ten to 100 kilometers,

which may seem like a long distance,

but in terms of the magnetosphere,
which is absolutely huge,

this is really a microscopic region

that we're trying to cover.

- MMS has in a nutshell,
two orbital phases,

which are designed to study reconnection.

- On the day side, basically
you have a situation

where the solar wind is
just constantly running into

Earth's magnetic field, and
this is really great for MMS

because we know that
there, at some point, MMS

is going to encounter
this region, and our hope

is that since this process
is always happening,

we're going to get lucky and
actually fly right through

the magnetic explosion as it's happening.

Now on the night side, the situation

is a little bit different.

So what happens is you have a more gradual

buildup of magnetic energy in the tail,

and these reconnection processes,
these magnetic explosions

can just sort of pop off randomly.

We don't really know when
it's going to happen,

or where it's going to happen in the tail.

- When you try to send both of those,

if we want to understand
how the magnetosphere works,

I would believe that
both of those scenarios

are also very important
for other applications,

such as on the sun, in the solar wind,

in planetary magnetospheres,

and in many astrophysical objects,

as well as in the laboratory.

- We hope that it's going to
allow us to improve our models,

so that we can put the
right physics in it,

and actually make predictions about

where and when reconnection
is going to happen,

and this will help us make
our space weather models

more predictively powerful.

The instruments that are
actually going to be measuring

the particles in space are
collecting them much more rapidly

at a much higher cadence than they have

on previous missions,
about a factor of 100.

So whereas it would take
a previous generation

particle instrument about
three or four seconds

to build up the whole picture of the sky,

it's going to take MMS
about 30 milliseconds,

so it really is sort of
game changing technology.

- The current two dozen
or so operating satellites

will be enhanced with new
missions under development.

The Japanese space
agency will be launching

their next solar physics
satellite SOLAR-C.

The Indian Space Agency
will launching Aditya,

to study the sun's coronoal mass ejections

and magnetic field structures.

The Deep Space Climate Observatory

will maintain real time
solar wind monitoring

capabilities critical to
the accuracy and lead time

of space weather alerts and forecasts.

The European Space Agency's
solar orbiter will be launched

in 2018 and fly closer to the
sun than the planet Mercury

to study how the sun creates
and controls its heliosphere.

Also planned for a 2018 launch
is NASA's Solar Probe Plus.

It will approach the sun more closely

than any other probe before,
just 3.8 million miles

from the surface of the star.

Scientists have long wanted
to send a probe through

the sun's outer atmosphere.

The spacecraft would be
exposed to temperatures

approaching 1,370 degrees Celsius.

Together they will continue to monitor,

study, and discover the
secrets of this nuclear anvil

that supplies us with light, life.

Aside from the science,
the images captured

reveal to us the beauty and power of this,

our nearest star, in all its grandeur.