The Venus transit of 2012 allowed us to measure the solar radius around
6173Å with HMI: we obtained a value of 959.58″ at 1 AU, with a
systematic uncertainty larger than 0.27″.
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We invite those who use HMI data for their research, or whose research
is closely related to HMI science objectives, to contribute to the HMI
science nuggets. -- SDO/HMI team