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Incorrect Values in Magnetogram Imagery


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Sam Warfel
This post was recognized by Sam Warfel!

"Thank you for investigating this interesting anomaly, and getting an authoritative answer!"

Jesterface23 was awarded the badge 'Helpful' and 20 points.

With solar cycle 25 ramping up, we have seen our first occurrence of odd pixels in SDO's HMI magnetogram imagery within a sunspot umbra.

SDO NASA official Dean Pesnell answered what was going on in the imagery. The imagery we look at on SDO's website is not science data. The near-realtime imagery uses a simplified algorithm delivering incorrect values for some strong fields.

To anyone new to this, here is an example of when the incorrect values occur. This happens to be within a red negative polarity spot,


Then there is one more note to share from Dean, "Please use the science data FITS files if your work is sensitive to this phenomenon.".

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