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SOHO spacecraft Sees a Huge Prominence on the Sun.

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SOHO Spacecraft.
SOHO Spacecraft: Image credit: http://www.esa.int/export/esaCP/SEM3ON8CURD_index_1.html.

The ESA/NASA SOHO spacecraft took a beautiful picture of an enormous prominence, 700,000 kilometres across, ejected from the surface of the Sun. An "eruptive prominence" is a mass of relatively cool plasma - only 80,000 C, instead of 1-2 million C in the upper atmosphere of the Sun. These are usually associated with coronal mass ejections (CMEs), and can affect the Earth's magnetosphere when they come our way.

On Friday, 12 March 2004, the Sun ejected a spectacular 'eruptive prominence' into the heliosphere. SOHO, the ESA/NASA solar watchdog observatory, faithfully recorded the event.

This 'eruptive prominence' is a mass of relatively cool plasma, or ionised gas. We say 'relatively' cool, because the plasma observed by the Extreme-ultraviolet Imaging telescope (EIT) on board SOHO was only about 80 000 degrees Celsius, compared to the plasma at one or two million degrees Celsius surrounding it in the Sun's tenuous outer atmosphere, or 'corona'.

At the time of this snapshot, the eruptive prominence seen at top right was over 700 000 kilometres across - over fifty times Earth's diameter - and was moving at a speed of over 75 000 kilometres per hour.

Eruptive prominences of this size are associated with coronal mass ejections (CMEs), and the combination of CMEs and prominences can affect Earth's magnetosphere when directed toward our planet. In this case, the eruptive prominence and associated CME were directed away from Earth.

SOHO is a mission of international co-operation between ESA and NASA, launched in December 1995. Every day SOHO sends thrilling images from which research scientists learn about the Sun's nature and behaviour. Experts around the world use SOHO images and data to help them predict 'space weather' events affecting our planet.

Original Source: ESA News Release

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