SOL 153 Dust Devil Watch
21 Frames - single stance -- 11:55 AM local
One interesting DD -- it starts late -- wait for it! (center)
Another on the far left
Click to view attachment
Full Version: Dust Devils In Jezero Crater
QUOTE (PDP8E @ Jul 25 2021, 12:54 PM) 
Another view of the SOL 148 Event
Annotated -- 9 dust devils and a few gusts.
The event is 5 minutes long and we have 21 seconds of images.
Annotated -- 9 dust devils and a few gusts.
The event is 5 minutes long and we have 21 seconds of images.
I really appreciate those animations. From memory this seems the most active 5 minutes observed so far in the area. Also, probably the clearest example of dust devils moving in opposite directions, simultaneously, perhaps hinting at local rotating 'supercells' spawning those turbulences.
SOL 154 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:30 PM local
DD's in the 4th and 5th sets
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 12:30 PM local
DD's in the 4th and 5th sets
Click to view attachment
SOL 153 -- NAV - 2:51 PM local
There is a right-left pair if someone wants to try an anaglyph
Click to view attachment
There is a right-left pair if someone wants to try an anaglyph
Click to view attachment
SOL 156 Dust Devil Watch
21 Frames - single stance -- 12:15 PM local
Two DDs on the left will blow out-- BUT at the end, a crisp DD strolls in on the far right
Click to view attachment
21 Frames - single stance -- 12:15 PM local
Two DDs on the left will blow out-- BUT at the end, a crisp DD strolls in on the far right
Click to view attachment
SOL 151 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 3:20 PM local
Only two stances with DD and gusts
GIF
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 3:20 PM local
Only two stances with DD and gusts
GIF
Click to view attachment
I finished up some improvements on the DD detector (C++) and tried it out on the SOL 148 Event.
Since this sequence was taken at High Noon at Jezero, there are no long shadows from the actual 'wispy' DDs.
So, I think the dark triangular 'mat' at the beginning is low flying dust flung from the passing DD. As the dust settles it takes on the color of the ground.
Light colors are more positive image pixels than the Averaged Comparison Image (21 frames), darks are more negative pixels
The program is fully automatic: drop the images in the working directory, press the button, and a minute later its is all done.
I believe a lot more hand processing would suss out more detail and make it more photorealistic.
I included the actual vs processed images as a comparison -- a little extra compression made it all fit into the upload limit.
GIF
Click to view attachment
Since this sequence was taken at High Noon at Jezero, there are no long shadows from the actual 'wispy' DDs.
So, I think the dark triangular 'mat' at the beginning is low flying dust flung from the passing DD. As the dust settles it takes on the color of the ground.
Light colors are more positive image pixels than the Averaged Comparison Image (21 frames), darks are more negative pixels
The program is fully automatic: drop the images in the working directory, press the button, and a minute later its is all done.
I believe a lot more hand processing would suss out more detail and make it more photorealistic.
I included the actual vs processed images as a comparison -- a little extra compression made it all fit into the upload limit.
GIF
Click to view attachment
SOL 166 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:30 PM local
Only one stance with DD
GIF
Click to view attachment
( I think the Rover team may be using greyscale to save image download bandwidth (?) )
360 degree quick peek (3 frames each in 5 stances) -- 12:30 PM local
Only one stance with DD
GIF
Click to view attachment
( I think the Rover team may be using greyscale to save image download bandwidth (?) )
Stereo (parallel) view attempt for DD sol157
..no parallax for make benefit stereo so subsequent bribe of glorious 'turtle' to pose foreground!Click to view attachment
..no parallax for make benefit stereo so subsequent bribe of glorious 'turtle' to pose foreground!Click to view attachment
Atomoid -A glorious turtle indeed!
SOL 169 - 21 image Dust Devil Watch -- 4:15 PM Local
NO DDs.
This is the single 'averaged' image:
Click to view attachment
SOL 169 - 21 image Dust Devil Watch -- 4:15 PM Local
NO DDs.
This is the single 'averaged' image:
Click to view attachment
SOL 170 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 3:45 PM local
No DDs but the terrain is interesting
GIF
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 3:45 PM local
No DDs but the terrain is interesting
GIF
Click to view attachment
SOL 172 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 5:05 PM local
No DDs -- late in the day... nice lighting
GIF
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 5:05 PM local
No DDs -- late in the day... nice lighting
GIF
Click to view attachment
SOL 173 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:30 PM local
Distant Gust in Stance 3
Very close Gust in Stance 5
GIF
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 12:30 PM local
Distant Gust in Stance 3
Very close Gust in Stance 5
GIF
Click to view attachment
SOL 174 - "30" image Dust Devil Watch -- 11:15 to 11:40 AM Local
ACTIVE
There is a 30 frame sub-frame sequence
and a 15 frame full-frame sequence
30 frame:
Click to view attachment
(full frame is too big and basically the same thing)
ACTIVE
There is a 30 frame sub-frame sequence
and a 15 frame full-frame sequence
30 frame:
Click to view attachment
(full frame is too big and basically the same thing)
Yet another DD watch on Sol 174
SOL 174 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) --11:45 AM local
Gust in Stance 5
GIF
Click to view attachment
SOL 174 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) --11:45 AM local
Gust in Stance 5
GIF
Click to view attachment
Re-processed SOL 173 DD
Increased the sensitivity for dark matter.
3 stances ...
* the first stance shows a distant event with dust flying
* the middle stance shows an increase of dust right before the NAV camera head swivels to the next stance
* The final sequence picks up the action -- gust? or DD off-camera??
GIF
Click to view attachment
Increased the sensitivity for dark matter.
3 stances ...
* the first stance shows a distant event with dust flying
* the middle stance shows an increase of dust right before the NAV camera head swivels to the next stance
* The final sequence picks up the action -- gust? or DD off-camera??
GIF
Click to view attachment
SOL 175 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:50 PM local
No DD
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 12:50 PM local
No DD
Click to view attachment
SOL 176 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:20 PM local
No DD - odd angle
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 12:20 PM local
No DD - odd angle
Click to view attachment
QUOTE (PDP8E @ Aug 20 2021, 08:04 AM)
No DD - odd angle
19.35 degrees (from JSON)
Sol 178: dust devils spotted at the left of NavCam images 
https://mars.nasa.gov/mars2020-raw-images/p...8_01_195J01.png
https://mars.nasa.gov/mars2020-raw-images/p...8_01_195J01.png
https://mars.nasa.gov/mars2020-raw-images/p...8_01_195J01.png
https://mars.nasa.gov/mars2020-raw-images/p...8_01_195J01.png
SOL 178 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:05 PM local
No DD - as we trundle down the service road between the ridge and the dunes ...
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 12:05 PM local
No DD - as we trundle down the service road between the ridge and the dunes ...
Click to view attachment
SOL 179 - 21 images (4 seconds apart) not sure why...
No DD ... looking at the ridge...
Click to view attachment
No DD ... looking at the ridge...
Click to view attachment
SOL 178 - 3:54 PM Local
rechecking images
there is a second fainter DD to the left of the 'visible' one that VikingMars pointed out... (and clouds too)
GIF
Click to view attachment
rechecking images
there is a second fainter DD to the left of the 'visible' one that VikingMars pointed out... (and clouds too)
GIF
Click to view attachment
It's a two-for-one day!
DD Watch on SOL 181
360 degree quick peek (3 frames each in 5 stances) -- one in the morning and one at noon
Three DDs in Stance 5 (on the noon watch)
NOON is TOP
MORNING is BOTTOM
Click to view attachment
DD Watch on SOL 181
360 degree quick peek (3 frames each in 5 stances) -- one in the morning and one at noon
Three DDs in Stance 5 (on the noon watch)
NOON is TOP
MORNING is BOTTOM
Click to view attachment
SOL 182 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 1:09 PM local
* Probable Distant DD in Stance 2 (a quarter of the way in from the left, against a distant hill)
* DD in Stance 5 to the left also
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 1:09 PM local
* Probable Distant DD in Stance 2 (a quarter of the way in from the left, against a distant hill)
* DD in Stance 5 to the left also
Click to view attachment
SOL 183 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 1:25 PM local
* Stance 1 -- Distant DD on the far right -- to the left of the horizon hills
* Stance 2 -- Distant DDs on the left -- picking up the DD action from Stance 1
* Stance 4 -- Distant DD in the hills
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 1:25 PM local
* Stance 1 -- Distant DD on the far right -- to the left of the horizon hills
* Stance 2 -- Distant DDs on the left -- picking up the DD action from Stance 1
* Stance 4 -- Distant DD in the hills
Click to view attachment
SOL 184 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 1:00 PM local
Stance 1 -- minor but real wind disturbance -- far-left
Stance 3 -- small DDs -- far-left and far-right
Stance 4 -- well-formed DD
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 1:00 PM local
Stance 1 -- minor but real wind disturbance -- far-left
Stance 3 -- small DDs -- far-left and far-right
Stance 4 -- well-formed DD
Click to view attachment
SOL 188 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 2:35 PM local
All Quiet -- detector gain noise
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 2:35 PM local
All Quiet -- detector gain noise
Click to view attachment
SOL 189 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) --4:45 PM local
All Quiet -- Stance 5 has an exposure timing diff due to facing the late afternoon Sun
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) --4:45 PM local
All Quiet -- Stance 5 has an exposure timing diff due to facing the late afternoon Sun
Click to view attachment
SOL 191 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) --4:40 PM local
All Quiet
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) --4:40 PM local
All Quiet
Click to view attachment
SOL 193 (A) - Dust Devil Watch
21 Images - 1 Stance -3:05 PM
All Quiet
Click to view attachment
the first of 2 DD watches that day
21 Images - 1 Stance -3:05 PM
All Quiet
Click to view attachment
the first of 2 DD watches that day
SOL 193 (b ) Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 3:10 PM local
Stance 4 has a DD climbing the crater rim
Click to view attachment
(the 2nd DD watch on SOL 193)
360 degree quick peek (3 frames each in 5 stances) -- 3:10 PM local
Stance 4 has a DD climbing the crater rim
Click to view attachment
(the 2nd DD watch on SOL 193)
SOL 197 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 11:30 AM local
Stance 1 -- DD far left
Stance 2 -- Two distant DD's, center
Stance 5 -- DD far right
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 11:30 AM local
Stance 1 -- DD far left
Stance 2 -- Two distant DD's, center
Stance 5 -- DD far right
Click to view attachment
SOL 200 - Dust Devil Watch
21 Images -- 1 Stance -- 4:30 PM (late in the day)
All Quiet
Click to view attachment
21 Images -- 1 Stance -- 4:30 PM (late in the day)
All Quiet
Click to view attachment
SOL 203 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 3:05 PM local
Stance 4 -- well-formed twister center-left
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 3:05 PM local
Stance 4 -- well-formed twister center-left
Click to view attachment
SOL 204 Dust Devil Watch
The Nav Cam caught this DD at 2:30 PM
(It is part of a Left/Right pair)
Click to view attachment
The Nav Cam caught this DD at 2:30 PM
(It is part of a Left/Right pair)
Click to view attachment
Quick FYI- new paper on Dust Devils...
Vortices and Dust Devils As Observed by the MEDA Instruments onboard Mars 2020 Perseverance Rover
https://arxiv.org/abs/2109.04601
Vortices and Dust Devils As Observed by the MEDA Instruments onboard Mars 2020 Perseverance Rover
https://arxiv.org/abs/2109.04601
SOL 208 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 1:40 PM local
Stance 3 -- DD far-right
Stance 4 -- The same DD, now far-left ... and another DD far-right
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 1:40 PM local
Stance 3 -- DD far-right
Stance 4 -- The same DD, now far-left ... and another DD far-right
Click to view attachment
.... Dust Devil Watches
SOL 210 21 images - 1 stance 4:15 PM -- NO DD
SOL 211 21 images - 1 stance 7:23 AM -- NO DD
SOL 212 no images
SOL 213 no images
SOL 214 15 images - 3 images - 5 stances 7:45 AM -- NO DD
SOL 214 21 images - 1 stance 8:40 AM -- NO DD
... more SOLS later...
SOL 210 21 images - 1 stance 4:15 PM -- NO DD
SOL 211 21 images - 1 stance 7:23 AM -- NO DD
SOL 212 no images
SOL 213 no images
SOL 214 15 images - 3 images - 5 stances 7:45 AM -- NO DD
SOL 214 21 images - 1 stance 8:40 AM -- NO DD
... more SOLS later...
SOL 215 - Dust Devil Watch
21 Images -- 1 Stance -- 10:43 AM
A moving Dust Devil visible in all 21 frames
and a close-range GUST in front of the camera!
Click to view attachment
21 Images -- 1 Stance -- 10:43 AM
A moving Dust Devil visible in all 21 frames
and a close-range GUST in front of the camera!
Click to view attachment
SOL 215 B -- the 2nd DD sequence of that SOL ... and a strange one
30 Frames -- 1 stance -- 27 minutes long! -- 10:56 AM to 11:23 AM
The timing between frames is roughly: 33 sec -- 84 sec -- 33 sec -- 84 secs -- etc.
Gusts and Dust Devils!
Click to view attachment
EDIT: the 3rd DD sequenceof that Sol at 3:10 PM had no DDs
30 Frames -- 1 stance -- 27 minutes long! -- 10:56 AM to 11:23 AM
The timing between frames is roughly: 33 sec -- 84 sec -- 33 sec -- 84 secs -- etc.
Gusts and Dust Devils!
Click to view attachment
EDIT: the 3rd DD sequenceof that Sol at 3:10 PM had no DDs
QUOTE (PDP8E @ Oct 1 2021, 04:22 PM)
The timing between frames is roughly: 33 sec -- 84 sec -- 33 sec -- 84 secs -- etc.
There's one a bit like that on MSL.... take three frames - wait a minute - take three more. The three frames get you motion of any DDs in the scene - the minute wait the spreads them out to get more temporal coverage.
This is the large DD that Damia B. pointed out when she made that amazing panorama!
(contrast-enhanced)
Click to view attachment
... and we are at conjunction for a few days
Perseverance has been exposed to winds, gusts, and vortices for 200+ Sols
These 'containers' are associated with the mast stowage prior to landing ( i think ...)
Now they make excellent particle collectors... I hope to revisit them every few hundred Sols
GIF
Click to view attachment
These 'containers' are associated with the mast stowage prior to landing ( i think ...)
Now they make excellent particle collectors... I hope to revisit them every few hundred Sols
GIF
Click to view attachment
QUOTE (PDP8E @ Oct 2 2021, 06:39 PM)
These 'containers' are associated with the mast stowage prior to landing ( i think ...)
Yes - the RSM was stowed against these before being deployed - that's the left Navcam and MastcamZ cover you're looking at.
SOL 236 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 1:45 PM local
DDs -- one in Stance 4 and another in 5
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 1:45 PM local
DDs -- one in Stance 4 and another in 5
Click to view attachment
SOL 241 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 11:00 AM local
DDs -- in Stance 4 and in 5
Click to view attachment
360 degree quick peek (3 frames each in 5 stances) -- 11:00 AM local
DDs -- in Stance 4 and in 5
Click to view attachment
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