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A very bright spot after GRS, anyone know what it is?

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#1 Yu Gu

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Posted 02 October 2021 - 07:46 AM

The Red channel from last night. Noticed this white spot that's quite bright (probably not an impact, since it's there the whole time). Anyone else seen it also?

Clear skies,
Gu

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  • Bright_Spot_22_27_29_lapl5_ap114_Drizzle30_AI_Deconvolution_25_J.jpg

Edited by Yu Gu, 02 October 2021 - 07:51 AM.

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#2 Yu Gu

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Posted 02 October 2021 - 08:10 AM

In the green channel:

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#3 DAG792

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Posted 02 October 2021 - 08:33 AM

You haven't mentioned the time(ideally UTC) but personally, I was observing on 2021-10-01 near midnight (UTC +5) and I think its Europa transiting the planet. 


Edited by DAG792, 02 October 2021 - 08:33 AM.


#4 Yu Gu

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Posted 02 October 2021 - 08:41 AM

Sorry, it was 2:27 UT, Oct 2 for Red and 2:36UT for the green.  


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#5 phileefan

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Posted 02 October 2021 - 08:43 AM

2021-10-02 0250 UT

R channel

 

 

 

 

 

 

2021-10-02-0250_8-P-R-Jup_lapl5_ap46_Drizzle15a copy.png


Edited by phileefan, 02 October 2021 - 08:44 AM.

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#6 Yu Gu

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Posted 02 October 2021 - 08:46 AM

Based on this. The moons were all quite far away...

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#7 Yu Gu

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Posted 02 October 2021 - 08:56 AM

Less bright in blue, 2:10 UTC.

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#8 phileefan

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Posted 02 October 2021 - 08:59 AM

2021-10-02 0250 UT.jpg



#9 Sunspot

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Posted 02 October 2021 - 09:01 AM

I wonder if anyone else was imaging at that time. We have seen a couple of outbreaks in about that area in the past couple of months. Wonder if this might be the third? My images came after this area just passed around the planet.


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#10 DAG792

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Posted 02 October 2021 - 09:03 AM

Based on this. The moons were all quite far away...

 

Well then its probably some kind of Atmospheric outbreak.


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#11 Yu Gu

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Posted 02 October 2021 - 09:15 AM

Maybe something like this? https://www.nasa.gov...spot-on-jupiter


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#12 Yu Gu

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Posted 02 October 2021 - 10:07 AM

Here is RGBgrin.gif

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#13 wargrafix

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Posted 02 October 2021 - 01:06 PM

I wonder if anyone else was imaging at that time. We have seen a couple of outbreaks in about that area in the past couple of months. Wonder if this might be the third? My images came after this area just passed around the planet.


I was. Still processing data
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#14 Borodog

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Posted 02 October 2021 - 04:28 PM

That is really quite extraordinary.



#15 Kiwi Paul

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Posted 02 October 2021 - 04:55 PM

It will interesting to see how the area develops. I was recently reading these white areas correspond to cold convective cloud tops and these areas represent strong upward motion in the atmosphere. Areas of strong upward motion are usually accompanied by sinking or downward motion in adjacent areas which induces warming and clearing of the clouds to some lower cloud top level which tend to have warmer temperatures and warmer colours?
So it will be interesting to see if this situation develops. We may even see some of the bluish areas as we saw in this region in the last month or so. Apparently these represent deep areas where cloud has cleared.
Cheers Paul

Edited by Kiwi Paul, 02 October 2021 - 04:56 PM.


#16 Yu Gu

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Posted 02 October 2021 - 06:15 PM

Thanks, everyone!

I am also really curious about how it will develop in the coming days. 

Looking at my recorded data, I was able to see it clearly in the images from 1:10UT to 3:52UT (maybe a bit later too).

Since the seeing varied over the night, I was not able to tell if it got brighter or dimmer during this period. 

I will upload more images here later (but need to get ready for imaging now).

Please post your images as well! 

Clear skies!

Gu


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#17 Yu Gu

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Posted 03 October 2021 - 08:59 AM

Dr. John H. Rogers from BAA explained to me that this is a new convective plume (giant thunderstorm) that several happened recently. The recently ones were on Sep 11 and Sep 17.

I went back to my older data and put all the GRS images (red channel) in one place (see picture below).

It seems like there were two in my Sep 15 image as well.

Clear skies,

Gu

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  • GRS from Aug 29 - Oct 02J.jpg

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#18 wargrafix

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Posted 04 October 2021 - 12:23 PM

here is my contribution

 

gallery_218407_320_27057.jpg


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#19 Yu Gu

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Posted 04 October 2021 - 08:15 PM

Hi wargrafix, thanks for the great photo! What time was it taken?

 

I was able to see Jupiter again for just a few minutes through the cloud gaps. It was just enough to get a new photo. I am putting it side by side with the one from Oct 2.

The spot is less bright but bigger. 

There is quite a bit changes in the surrounding area in three days!

Gu

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  • J_Jupiter_Bright_Spot_Oct 02_05 2021_V1J.jpg

Edited by Yu Gu, 04 October 2021 - 08:59 PM.

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#20 Kiwi Paul

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Posted 04 October 2021 - 08:57 PM

Very interesting comparison. One can imagine this convective cloud top has reached an area in Jupiters upper atmospheric levels that it has either run out of buoyancy (the updraft is not much warmer than the surrounding atmosphere) or it has encountered an inversion which halts the upward growth and then spreads the cloud top out like the anvil on an earth base cumulonimbus cloud (thunderstorm). It will interesting to see if we see darker bluish areas develop around this updraft.
Cheers Paul

#21 Lopper

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Posted 04 October 2021 - 09:03 PM

The dark blue features are thought to reside lower in the atmosphere, right? So Paul are you thinking that the white spot is an updraft that might eventually dredge up dark blue material from lower down?


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#22 wargrafix

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Posted 04 October 2021 - 09:04 PM

Date=021021
Start=022702.201
Mid=022744.782
End=022827.363



#23 Kiwi Paul

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Posted 04 October 2021 - 09:14 PM

The dark blue features are thought to reside lower in the atmosphere, right? So Paul are you thinking that the white spot is an updraft that might eventually dredge up dark blue material from lower down?


Hi Lopper. The way it works is that the updraft air has to go somewhere, and if it meets a lid like a strong invertion, then you can get sinking air likely downstream of any environmental flow (wind) around the cloud top.
Sinking air leads to atmospheric warmimg (through compression like a bicycle pump) and this clears the atmosphere of cloud. If this clearing goes deep enough then we are told that such areas take on a bluish colour (just like our sky)
and the deeper the sinking the darker the blue would likely be.
Cheers Paul
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#24 Lopper

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Posted 04 October 2021 - 09:28 PM

Very interesting, Paul. And very well-explained, too. Thanks! If I understand what you're saying, the dark blue festoons on Jupiter are not the result of the presence of compounds that absorb visible light in a way that renders them blue, but rather they are due to clearings in the upper cloud decks that allow light to penetrate further down, thus producing scattering effects like the Rayleigh scattering that we experience here? Did I get that correct?

 

Matt


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#25 Kiwi Paul

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Posted 04 October 2021 - 10:19 PM

Exactly!
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