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Processed Cassini Jupiter Images, Fun with the PDS files
Bjorn Jonsson
post Aug 3 2005, 10:26 PM
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Now that I have downloaded all of the PDS formatted Cassini Jupiter images (and actually all of the Saturn images too) I have been experimenting with processing calibrated versions of them:

http://www.mmedia.is/bjj/misc/css_stuff/im...grnbl1_proc.jpg
http://www.mmedia.is/bjj/misc/css_stuff/im...olor_mosaic.jpg

The first one is simply a global view composed from CB1 (red), GRN and BL1 filtered images with the color balance adjusted to make it more realistic and with some sharpening applied to the image. This is a preliminary version, it looks very bluish at the limb due to Jupiter's rotation (I preferred this to color fringing at the center of Jupiter's disk). Later I plan to fix this by rotating the images in 3D space.

The second one is a reprocessed version of the well known Io transit image but with the addition of the north polar region - since this is a preliminary version some seams may be visible. Later this may turn into a global mosaic. The color balance is also improved. The 'official' image seems to have been composed from CB2, (CB2+BL1)/2 and BL1 filtered images (only CB2 and BL1 images are available). Using CB2 as red makes the belts too reddish if you want whitish zones. To fix this I used a synthetic CB1 image created from a linear combination of the CB2 and BL1 images. Needless to say I also used a synthetic green image.

Now the plan is to do a big cylindrical map of Jupiter followed by an even bigger one of Saturn.
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Bjorn Jonsson
post Jun 11 2019, 07:41 PM
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The recent Great Red Spot (GRS) 'disruption' has been very interesting. Anticyclonic spots have been moving towards the GRS from the east, entering the red spot hollow and then moving around the GRS. This has sometimes managed to distort the apparent shape of the GRS. This is especially noticeable in methane band images (these images are indicative of cloud altitudes with bright areas in these images being high altitude clouds or hazes). Red blades/flakes also appear to separate from the GRS when this happens.

I took a look at the Cassini Jupiter images because I vaguely remembered seeing a distorted GRS shape in the Cassini MT3 images (the MT3 filter is centered at 889 nm, a very strong methane absorption band). I found an interesting image obtained on December 15, 2000. Here it is map-projected; notice the western end of the GRS:

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Comparing this to enhanced color images reveals that the bright 'lane' of material emanating from the western end of the GRS in the MT3 image has an orange color. Below is a blink comparison (an animated GIF) where an enhanced color image and the MT3 image are blinked. The color image is created from CB2, synthetic green and BL1 filtered images and has been contrast enhanced and processed to increase color differences.

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A look at what happened leading up to this is interesting. Here is an animated GIF from seven MT3 images obtained between December 9 and 15, 2000. The images are not evenly spaced in time.

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It's interesting that the shape of the area of high altitude clouds/haze associated with the GRS does not stay constant.

Here is an animated GIF from a sequence of seven enhanced color images obtained at roughly the same times as the MT3 images. An anticyclonic spot can be seen entering the red spot hollow from the east:

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Converting the enhanced color images to an animated GIF results in some loss of image quality since the GIF format only supports 256 colors per image or less. Here are the original map-projected frames I used to create the animated GIFs. They are of slightly higher quality:


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These interactions between the GRS and the incoming spot are considerably more subtle in true color images than in the enhanced images above. Below are approximately true color images processed from the original image data:

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I think the events visible in these images are a 'miniature' version of what has been happening to the GRS recently. Red/orange material seems to be torn out of the GRS and the GRS shape gets distorted. The effects of this are not nearly as pronounced as what has been happening recently though.
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JRehling
post Jun 12 2019, 07:02 AM
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Fantastic and fascinating stuff, Bjorn. I've been watching Jupiter through my own telescope the past five years now, and surely the GRS has gone through some unusual activity this year, as you note (which may be concluding?), and as the Juno images make quite striking.

That's a nice catch to note the similarity to the Cassini-era weather patterns. I would add that other things going on near the GRS are quite different now than then. Currently, there is a very obvious pair of dark, thin bands east of the GRS and the South Temperate Belt is particularly bright (or, at least, wide) southwest of the GRS.

Juno's ultra-zoom mode means that the regional context isn't always captured, so here's one of my pictures of Jupiter from June 9 to add the context.

It is fascinating to watch this planet change over time. The duration of one Earthly year is, of course, in no way causally related to anything on Jupiter in a meaningful way, but it does seem, by coincidence, to be a useful unit for measuring visible changes on a planet-wide basis. It seems to look about the same for months at a time, but always be different when it swings around for another opposition.
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Posts in this topic
- Bjorn Jonsson   Processed Cassini Jupiter Images   Aug 3 2005, 10:26 PM
- - Ian R   Awesome work, Bjorn!   Sep 12 2005, 01:15 AM
- - Ian R   Now, I'm usually a RAW images man - I like put...   Dec 15 2009, 03:28 PM
- - Ian R   A comparison of an image from the PDS, before and ...   Dec 15 2009, 03:40 PM
- - Ian R   Jupiter and Io, two days before (October 12th):   Dec 15 2009, 03:54 PM
- - Ian R   Jupiter and Callisto (I think?) on the 1st of Octo...   Dec 15 2009, 04:07 PM
- - Ian R   Last of all, for the time being, a classic view of...   Dec 15 2009, 04:19 PM
- - Ian R   Here's a 4-frame NAC mosaic from the 10th Dece...   Dec 18 2009, 09:41 AM
- - Ian R   ...and a rather pretty view of Io transiting the J...   Dec 18 2009, 02:57 PM
|- - tedstryk   Wow, that one is exquisite!   Dec 18 2009, 03:15 PM
- - Ian R   Thanks Ted! It took me a little while to fi...   Dec 18 2009, 03:50 PM
- - machi   Very nice images! Jupiter is one of the most p...   Dec 18 2009, 04:02 PM
|- - ugordan   QUOTE (machi @ Dec 18 2009, 05:02 PM) Jup...   Dec 18 2009, 06:04 PM
|- - Ian R   QUOTE (machi @ Dec 18 2009, 04:02 PM) Ima...   Dec 19 2009, 11:00 AM
|- - tedstryk   For a different perspective, here is a Galileo/gro...   Dec 19 2009, 04:40 PM
- - Paolo   wow! I set the image of Ganymede transiting as...   Dec 18 2009, 08:22 PM
- - nprev   Knockout work again, Ian & Gordan! What am...   Dec 18 2009, 08:58 PM
- - Ian R   Good grief Gordan - you just keep on coming up wit...   Dec 19 2009, 10:00 AM
|- - nprev   QUOTE (Ian R @ Dec 19 2009, 02:00 AM) the...   Dec 19 2009, 10:05 AM
- - Ian R   Nice one Nprev - maybe Doug could have some T-shir...   Dec 19 2009, 10:55 AM
- - Ian R   A vista of Jupiter and Io from the 10th of Decembe...   Dec 19 2009, 11:22 PM
|- - tedstryk   Beautiful image, although the background could use...   Dec 19 2009, 11:26 PM
- - Ian R   Thanks for the pointer, Ted - I've uploaded a ...   Dec 19 2009, 11:46 PM
|- - tedstryk   Thanks! As for the image background, if I had...   Dec 20 2009, 04:22 AM
|- - tedstryk   Here is a closeup detail from January 1, 2001, aga...   Dec 20 2009, 09:56 PM
- - Ian R   Nice one Ted. Here's another Jupiter-Io pairin...   Dec 21 2009, 12:39 PM
|- - ugordan   Hey, nice one! I don't recall seeing that ...   Dec 21 2009, 12:50 PM
- - Ian R   Thanks Gordan! Here's the full-disc, tw...   Dec 21 2009, 01:39 PM
- - Ian R   This is a four-frame NAC mosaic from December 8th,...   Dec 23 2009, 08:12 AM
- - Bjorn Jonsson   This is a 2x2 mosaic of Cassini images obtained on...   Jul 10 2012, 02:20 PM
- - Bjorn Jonsson   The recent Great Red Spot (GRS) 'disruption...   Jun 11 2019, 07:41 PM
- - JRehling   Fantastic and fascinating stuff, Bjorn. I've b...   Jun 12 2019, 07:02 AM


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