Today's Big Prominence Group & Convection Cells | Aug 10th 2018

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MalVeauX
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Today's Big Prominence Group & Convection Cells | Aug 10th 2018

Post by MalVeauX » Fri Aug 10, 2018 9:31 pm

Heya,

Not a lot of proms today, but one really nice grouping. Seeing was decent between the clouds today, maybe the turbulence of the summer is finally calming. This was later in the day for me, which is abnormal, so maybe it was a fluke. I was able to image at the full scale of the 6 inch refractor that I was using to try and resolve more of the prominence grouping and since I saw finger-like spicules on the limb, I figured seeing must be decent. Not a lot of other features to really look at, so just spent time on the prominence and then fooled around with the active region a little too and looked at the convection cells in white light using a near UV filter to increase contrast of the convection cells.

HA: Celestron 152mm F8 with 210mm Extensions & UV/IR Cut filter (ERF) + Quark + ASI174MM

WL: Celestron 152mm F8 with 160mm Extensions & Baader Blue CCD Filter (ERF) & 375~395nm Cut Filter + 3x Barlow + ASI174MM

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Very best,

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Re: Today's Big Prominence Group & Convection Cells | Aug 10th 2018

Post by MalVeauX » Fri Aug 10, 2018 10:29 pm

I have some weird results on a few too.

I'm not sure if I was off-band due to temperatures (it was way too hot today) or if it was just good seeing and a wider bandpass due to single stack or what, but it looks like convection cells leaking through to the chromosphere blending the two. They are present without any sharpening or anything, so it's not just artifact. My guess is off band and leaking?

:?:
Offband_HA_ConvectionCells_08102018.jpg
Offband_HA_ConvectionCells_08102018.jpg (380.43 KiB) Viewed 256 times
Offband_Filament_ConvectionCells_08102018.jpg
Offband_Filament_ConvectionCells_08102018.jpg (437.66 KiB) Viewed 256 times
Very best,

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Re: Today's Big Prominence Group & Convection Cells | Aug 10th 2018

Post by marktownley » Sat Aug 11, 2018 10:46 am

Top shots Marty! The last ones are off band and it is just continuum leakage coming through, hence why you can see the granules. The sun looks pretty much overhead where you are.
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Re: Today's Big Prominence Group & Convection Cells | Aug 10th 2018

Post by ffellah » Sat Aug 11, 2018 12:07 pm

I love the prominences and convection cells, Marty

Franco :band

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Re: Today's Big Prominence Group & Convection Cells | Aug 10th 2018

Post by p_zetner » Sat Aug 11, 2018 12:14 pm

Nice shots, Marty.
Cheers, Peter.

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Re: Today's Big Prominence Group & Convection Cells | Aug 10th 2018

Post by MalVeauX » Sat Aug 11, 2018 12:30 pm

Thanks!

Figured i was off-band. First time it happened. Everything was so hot yesterday, even the camera felt hot. I guess at Zenith the sun is pouring even more heat with less atmosphere and I wasn't blocking all of it well enough? Might be time for a full aperture DERF.... sigh!

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