SOHO, the Solar & Heliospheric Observatory, is a project of international collaboration between ESA and NASA to study the Sun from its deep core to the outer corona and the solar wind. Previous post Best of SOHO I
1 Extreme ultraviolet Imaging Telescope (EIT) 304Å image of a pair of similarly shaped prominences from 11 January 1998.
A collage of prominences, which are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. At times, they can erupt, escaping the Sun's atmosphere. For all four images, emission in this spectral line of EIT 304Å shows the upper chromosphere at a temperature of about 60,000 degrees K. The hottest areas appear almost white, while the darker red areas indicate cooler temperatures. Going clockwise from the upper left, the images are from: 15 May 2001; 28 March 2000; 18 January 2000, and 2 February 2001. Credit: SOHO (ESA & NASA) #
2 One hour of a coronal mass ejection on Feb. 26-27, 2000 taken by EIT 195Å. A CME blasts into space a billion tons of particles travelling millions of miles an hour. This particular CME led to the "lightbulb- shaped" images seen by LASCO's C2 and C3 instruments on Feb. 27th. Credit: SOHO (ESA & NASA) #
3 Coronal Diagnostic Spectrometer (CDS) images of active region loops of elements at different temperatures and wavelengths. The small square on the nearly simultaneous EIT image of the Sun indicates the field of view of CDS. Credit: SOHO (ESA & NASA) #
4 Fireworks in sequence from four instruments – This CME, part of a series of 5 CMEs in late November 2000, shows its progress from a sunspot group (MDI), to the flash of a flare (EIT 195Å), to a blasting CME seen 14 hours later (LASCO C2), and to a large expanding CME cloud over three hours later. Credit: SOHO (ESA & NASA) #
5 An EIT image in the 304 Angstrom wavelength of extreme UV light from each year of nearly an entire solar cycle. Credit: SOHO (ESA & NASA) #
6 An EIT image in the 284 Angstrom wavelength of extreme UV light from each year of nearly an entire solar cycle. Credit: SOHO (ESA & NASA) #
7 Blasting CME
This LASCO C2 image, taken 8 January 2002, shows a widely spreading coronal mass ejection (CME) as it blasts more than a billion tons of matter out into space at millions of kilometers per hour. The C2 image was turned 90 degrees so that the blast seems to be pointing down. An EIT 304 Angstrom image from a different day was enlarged and superimposed on the C2 image so that it filled the occulting disk for effect. Credit: SOHO (ESA & NASA) #
8 Active regions and magnetic loops as recorded by EIT in the Fe IX/X 171Å line. The temperature of this material is about 1 million K in the lower corona. Credit: SOHO (ESA & NASA) #
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