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SDO, (Solar Dynamics Observatory)
Explorer1
post Aug 30 2018, 05:01 PM
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It's faint, but I can see it in both the Spaceweather images ( http://spaceweather.com/images2018/30aug18...i687mccdvc5rrq4 ) and here: https://sdo.gsfc.nasa.gov/assets/img/latest...t_1024_HMII.jpg

Roughly the 3 to 4 o'clock position. It hasn't moved so it must be an artifact as JSOC says.
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mcaplinger
post Aug 30 2018, 05:29 PM
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QUOTE (Explorer1 @ Aug 30 2018, 09:01 AM) *
It's faint, but I can see it in both the Spaceweather images...

Could somebody post an actual image with the artifact annotated? I still don't know what you're talking about.

[edit: sorry, I missed Richard's post. If that's what we're talking about, I'm not sure what the fuss is over. It's not like you could mistake that for a nature feature and it's so faint I can barely see it.]


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dudley
post Aug 30 2018, 06:24 PM
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The anomaly was much more noticeable, earlier in the month. The fact that it changes, yet persists seems possibly significant, in itself. Please find a link, below, to the SDO image from August 17th:

SDO Archive
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elakdawalla
post Aug 30 2018, 06:49 PM
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I'd suggest calling it an "artifact" as the JSOC does, rather than "anomaly," because the latter word means "very serious problem" to space engineers and this doesn't seem to rise to that level. It's annoying to have a new artifact that can't immediately be dealt with in calibration, but no more than that; I can't see this affecting science. I will be curious to learn what JSOC eventually has to say about what they think caused it. My money's on an unwelcome guest in the form of a teeny speck of dust somewhere.


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mcaplinger
post Aug 30 2018, 07:42 PM
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QUOTE (elakdawalla @ Aug 30 2018, 10:49 AM) *
I will be curious to learn what JSOC eventually has to say about what they think caused it.

If you read the description of the instrument at http://hmi.stanford.edu/Description/hmi-ov...i-overview.html you'll find that it's basically a camera that takes images in 12 very narrow bandpasses centered at 617.3 nm, produced by a tunable filter with a bunch of moving parts. There's also an image stabilizer inside the instrument. Pretty complicated, and presumably with a lot of possible ways to go wrong.

I'm not sure how close to raw the images we see are, probably not very close.


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