Curious noise pattern in video footage

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This isn’t really a question with much consequence, but more a curiosity.

I was compositing a shot at work and one thing I have to do is isolate just the noise and clone over my work area so that the comp doesn’t show up in the noise.

I noticed that when gained up the noise alternated from predominantly blue on one frame to predominantly red on the next.

I’m not sure what camera they used, but I think it’s an Arri Alexa.

any idea why this alternating noise pattern would exist? Is it part of its cooling system, maybe?
 

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