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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect Segment explaining Earth oribiting satellites that record and analyze the causes of auroras. The segment explores the IMAGE satellite and other technology.

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Thanks, Jennifer. 00:00:00

Aurora tell us in a dramatic way that something invisible is happening above our heads in space to light up our skies. 00:00:03

We can use sophisticated Earth-orbiting satellites to learn more about the causes of the aurora. 00:00:09

The Imager for Magnetosphere-to-Aurora Global Exploration, or IMAGE, 00:00:14

is a NASA satellite that lets us see the invisible activity that swirls around the Earth 00:00:19

and eventually causes aurora to appear. 00:00:24

When a solar storm collides with Earth, one of the first signs of the disturbance 00:00:26

is a collection of particles called the ring current. 00:00:30

It's an invisible river of charged particles extending over 30,000 kilometers from Earth. 00:00:33

Much of the matter in this current actually comes from the Earth's upper atmosphere 00:00:38

in gigantic plumes and fountains of gas from the polar regions. 00:00:42

But we still don't know how the particles get their energy. 00:00:46

Another part of the upper atmosphere, seen by IMAGE for the first time, 00:00:49

is what scientists call the plasmasphere. 00:00:53

It extends out into space at least 10,000 kilometers. 00:00:56

You should think of it as the outer limits to the ionosphere. 00:00:59

During severe storms, parts of the plasmasphere are stripped off, 00:01:02

but then reform as new gas flows out of the Earth's upper reaches. 00:01:06

And, of course, IMAGE also provides scientists with movie-like, high-resolution views of the aurora seen from space. 00:01:11

Over the South Pole, the satellite dips down to 1,000 kilometers 00:01:18

to show us never-before-seen details in auroral structure. 00:01:22

The aurora in the South Pole is called Aurora Australis. 00:01:26

Over the North Pole, we see a more distant view and a bigger picture. 00:01:30

We can relate this big picture with views of the ring current and plasmasphere 00:01:34

to track the evolution of an aurora from cradle to grave. 00:01:38

The reason why we're so keen to understand the aurora 00:01:42

is that the aurora are kind of like a final examination. 00:01:45

If we can really understand how they work, 00:01:48

that means we also understand all the other things about Earth's environment as well. 00:01:50

We have billions of dollars of satellite technology in space, 00:01:54

astronauts living and working in space, 00:01:58

and on the ground, many kinds of systems that are affected by solar storms. 00:02:00

An electrical blackout in Canada back in 1989 cost billions of dollars. 00:02:04

We have lost over $2 billion of expensive communication and research satellites 00:02:09

in the last 10 years alone. 00:02:13

Solar storms have tremendous potential to cause damage to us. 00:02:15

Only by understanding aurora and the events that lead up to them 00:02:19

can we improve our ability to predict how to avoid the harmful effects of space weather storms. 00:02:22

The real challenge is to get enough early warning that a storm is approaching. 00:02:28

That's why it's also important to look at the sun for clues to the next storm. 00:02:32

Thanks, Sten. 00:02:36

Okay, guys, now it's your turn to apply data analysis and measurement skills 00:02:37

with this really cool activity. 00:02:41

Sten, they are gorgeous, aren't they? 00:02:43

Aren't they amazing? 00:02:45

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Materias:

Matemáticas

Niveles educativos:

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- - Nivel Intermedio

Autor/es:

NASA LaRC Office of Education

Subido por:

EducaMadrid

Licencia:

Reconocimiento - No comercial - Sin obra derivada

Visualizaciones:

484

Fecha:

28 de mayo de 2007 - 16:51

Visibilidad:

Público

Enlace Relacionado:

NASAs center for distance learning

Duración:

02′ 48″

Relación de aspecto:

4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.

Resolución: