Solar and Heliospheric Observatory

The Solar and Heliospheric Observatory (SOHO) is a telescope, launched in late 1995, space fruit of a joint project of NASA and ESA, the European Space Agency, used to study the Sun
SOHO has several tools, among them the Extreme UV Imaging Telescope (EIT), the Michelson Doppler Imager (MDI), the Large Angle Spectrometer Coronagraph (LASCO).
In this page, and this page offers pictures, almost in real time, that these three instruments of SOHO provide.
The data collected are available on this page, other data and images are available on this page.
All times shown are in UT (Universal Time). The LASCO is able to capture images of the solar corona. The most striking feature of the corona are usually the "coronal streamers" that can be seen in the images of C2 and C3. Sometimes you can see the solar coronal mass ejections. C2 images show the sun from a distance of 8.4 million kilometers, C3 images show the sun from a distance of 45 million kilometers.
The EIT catch the sunlight at different wavelengths, the EIT images show the Sun at different temperatures. In the images taken at 304 Angstroms the bright shares are at a temperature between 60,000 and 80,000 degrees Kelvin. In the images to 171 Angstroms are bright sides to a temperature of 1 million degrees Kelvin, in the images to 195 Angstroms are bright sides to a temperature of 1.5 million degrees Kelvin, a 284 Angstrom images are bright sides to a temperature 2 million degrees Kelvin.
MDI images were collected in the continuum in the vicinity of 6768 Angstroms. The most important features are the sunspots.

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