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I am looking for a description about how this number called Magnetic Activity Index (MAI) is calculated. All I know is that the processing pipeline of the instrument HMI calculates it. But I would like to know how this quantity is defined and computed! I have not yet found anything on google about it, not even an article.

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  • $\begingroup$ Is this the HMI you are refering to ? hmi.stanford.edu $\endgroup$ – usernumber Oct 27 at 8:59
  • $\begingroup$ Yes it is! I visited this website, but the magnetic activity index is not mentioned $\endgroup$ – Vanessa Oct 27 at 15:56

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