Solar and Heliospheric Observatory (SOHO)

The ESA/NASA Solar and Heliospheric Observatory (SOHO) mission consists of one spacecraft in a halo orbit around the Sun–Earth L1 point. From here, it has an uninterrupted view towards the Sun. SOHO carries twelve instruments but the Large Angle and Spectrometric Coronagraph (LASCO) instrument is now by far the most important instrument. LASCO consists of two white light coronagraphs which both cover two different field-of-views. By creating an artificial solar eclipse, this instrument reveals coronal mass ejections that erupt from the Sun as seen from Earth's point of view. This makes LASCO imagery of vital importance when it comes to deciding the trajectory of coronal mass ejections.

LASCO C2 (RAW)

LASCO unprocessed C2

LASCO C3 (RAW)

LASCO unprocessed C3

Courtesy of SOHO/LASCO consortium. SOHO is a project of international cooperation between ESA and NASA.

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