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Heliospheric imagers are generally flown in space because the Earth's atmosphere itself interferes with the signal even at night. Terrestrial features such as clouds, aircraft, moonlight, small variations in dust and moisture content of the air column, and even high altitude
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spacecraft in deep space. The concept was first demonstrated in the 1980s via detailed post-processing of photometer data from the two HELIOS spacecraft flown in the 1970s.
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satellite in high polar orbit, and the HI imagers that formed part of the SECCHI instrument suite on board NASA's twin
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Eyles, C. J. (2003). "The Solar Mass
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is a wide-field camera that is designed to image the
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