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Helioseismic and Magnetic Imager for SDO

https://hmi.stanford.edu/

“HMI is an instrument designed to study oscillations and the magnetic field at the solar surface, or photosphere. HMI is one of three instruments on the Solar Dynamics Observatory; together, the suite of instruments observes the Sun nearly continuously and takes a terabyte of data a day. HMI...” (from the page’s text)

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