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Massive prom southern limb


Steve Clay

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5 hours ago, Highburymark said:

Wonder how many earths tall it is? Hazard a guess at about 20?

Back of a fag packet calculation - it was one fifth the diameter of the Sun, or around 280,000km, which would make it 22 times the size of the earth.

I see what you’re getting at Stu - I didn’t see as much detail in the arch as you did - that second fork was quite faint in my scope. I should have tried single stack for that.

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2 hours ago, Highburymark said:

Back of a fag packet calculation - it was one fifth the diameter of the Sun, or around 280,000km, which would make it 22 times the size of the earth.

I see what you’re getting at Stu - I didn’t see as much detail in the arch as you did - that second fork was quite faint in my scope. I should have tried single stack for that.

I reckon you are probably about right there, quite amazing!

There is a video of what SpaceWeather described as an eruption.

justerupted.gif
 

https://spaceweathergallery.com/indiv_upload.php?upload_id=167055

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I’m trying to get my head around the dynamics of the prom/eruption as the plasma was clearly falling back down to the surface, so I can’t work out whether it erupted from the same place or not.

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This was visible on Wednesday (29 July) or if not something in the same place.  Likewise on Thursday.  Today it was noticably longer (about 1/10th Solar diam at 8am, but maybe bigger as the reticle I was using is a bit cruddy).  By 10.10 am the top end seemed to have detached from the base.

Looking at the NISP views, it seems to have vanished  (22.50 UT+1).

Great while it lasted.

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