The Solar Mass Ejection Imager

Physics

Scientific paper

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Stellar Mass Ejection, Solar Wind Velocity, Image Velocity Sensors, Satellite-Borne Instruments, Heliosphere, Sun, Thomson Scattering, Shock Waves, Imaging Techniques, Electromagnetic Radiation, Radiation Measurement, Velocity Measurement

Scientific paper

We are designing a Solar Mass Ejection Imager (SMEI) capable of observing the Thomson-scattered signal from transient density features in the heliosphere from a spacecraft situated near AU. The imager is designed to trace these features, which include coronal mass ejections. corotating structures and shock waves, to elongations greater than 90 deg from the Sun. The instrument may be regarded as a progeny of the heliospheric imaging capability shown possible by the zodiacal-light photometers of the HELIOS spacecraft. The instrument we are designing would make more effective use of in-situ solar wind data from spacecraft in the vicinity of the imager by extending these observations to the surrounding environment. The observations from the instrument should allow deconvolution of these structures from the perspective views obtained as they pass the spacecraft. An imager at Earth could allow up to three days warning of the arrival of a mass ejection from the Sun .

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