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Here comes the sun: Astonishing 'whip' half a million miles long spotted on solar surface (and scientists say radiation from it is heading for earth)
Here comes the sun: Astonishing 'whip' half a million miles long spotted on solar surface (and scientists say radiation from it is heading for earth)
- Radiation from the eruption set to hit earth within hours, creating a 'moderate geomagnetic storm'
- Incredible phenomenon could give new insight into how solar eruptions affect electricity supplied on earth
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NASA today released stunning video showing a 500,000 mile long 'solar whip' on the surface of the sun - and say radiation from it is headed for earth.
Captured by from NASA's Solar Dynamics Observatory (SDO), it shows a very long, whip-like solar filament extending over half a million miles in a long arc above the sun's surface.
This incredible image from NASA's Solar Dynamics Observatory (SDO) shows a very long, whip-like solar filament in the centre of the image, extending over half a million miles in a long arc above the sun's surface.
WHAT IS A 'SOLAR WHIP'?
A 'solar whip' or filament is caused when a red glowing loop of plasma erupts, releasing the plasma out in huge loops hundreds of thousands of miles into space.
The filaments are anchored to the Sun's surface in the photosphere, and extend outwards into the Sun's hot outer atmosphere, called the corona.
The filaments are anchored to the Sun's surface in the photosphere, and extend outwards into the Sun's hot outer atmosphere, called the corona.
The image and video (below), which covers August 6 to 8, 2012 show the filament as a darker strand that has been in view for several days.
'Towards the end of the video part of the filament seems to break away, but its basic length and shape seem to have remained mostly intact,' says Nasa.
The video, which condenses three hours of activity, also reveals the action in dramatic detail in extreme ultraviolet light.
Today it emerged the eruption was so large it will reach earth.
The NOAA spaceweather prediction center estimates that a cloud of radiation from the eruption will reach Earth today.
The radiation cloud will create a minor to moderate geomagnetic storm, bringing the northern lights to parts of North America.
Nasa says the image is a classic example of a solar prominence (also known as a filament when viewed against the solar disk).
This is a large, bright feature extending outward from the Sun's surface. Prominences are anchored to the Sun's surface in the photosphere, and extend outwards into the Sun's hot outer atmosphere, called the corona.
A prominence forms over timescales of about a day, and stable prominences may persist in the corona for several months, looping hundreds of thousands of miles into space.
However, scientists are still researching how and why prominences are formed.
The red-glowing looped material is plasma, a hot gas comprised of electrically charged hydrogen and helium.
The prominence plasma flows along a tangled and twisted structure of magnetic fields generated by the sun's internal dynamo.
An erupting prominence occurs when such a structure becomes unstable and bursts outward, releasing the plasma.
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