Changes at Low Ridge Haven |
Changes at Low Ridge Haven |
Sep 18 2006, 04:56 PM
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#1
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Senior Member Group: Members Posts: 4247 Joined: 17-January 05 Member No.: 152 |
It's been pretty slow in the Spirit forum recently, but hopefully this will reawaken it.
A new thin dark streak is visible in the latest sol 961 rear hazcam, that wasn't visible in the previous shot, from sol 924. It's visible in both L and R hazcam views. It looks remarkably like a dust devil streak, but the scale is very small. Here's the R hazcam from sol 894 subtracted from the 961 image: The dark streak cuts across more or less from left to right about a third of the frame down from the top. Other differences are visible, mostly around rocks, due to the change in sun angle between the frames. To demonstrate that the dark streak isn't just an effect due to that change in sun angle, look at these three frames: sol 856, local time 11:07 sol 961, local time 11:21 sol 894, local time 11:45 You can see that the shadows move progressively from the sol 856 to 961 to 894 frames above, as you'd expect from the local times they were taken. But if you flip between the three frames, you can see the dark streak only in the middle (sol 961) frame. If the streak were due to changing sun angle it would be at least as strongly visible in the 856 or 894 frame. Therefore it's not due to sun angle. As I said, this is way too small for a dust devil streak. And, I don't think we're anywhere near dust devil season. My guess about the origin of this is a small "crumble event" on one of those dark rocks in the upper left, followed by the normal winds blowing some dark dust downwind. Anyone know if the streak direction is consistent with what the winds should be doing now? Has anyone else noticed changes near Spirit? |
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Sep 18 2006, 07:30 PM
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#2
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
The attachment that Fred did - and the one I did - are basically the difference between the Sol 961 image, and the other RHAZ images. So that dark streak is something that has changed between the last RHAZ image, and that Sol 961 one. It reminds me of the sort of trail left behind after a DD in Mark's enhanced DD movies.
Doug |
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Sep 18 2006, 07:41 PM
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#3
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Senior Member Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
The attachment that Fred did - and the one I did - are basically the difference between the Sol 961 image, and the other RHAZ images. So that dark streak is something that has changed between the last RHAZ image, and that Sol 961 one. It reminds me of the sort of trail left behind after a DD in Mark's enhanced DD movies. Doug Not joking (realy). How far is this? Look prety close though. Any notice of a side effect on power supply (clean up)? -------------------- |
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Sep 18 2006, 08:42 PM
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#4
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Dublin Correspondent Group: Admin Posts: 1799 Joined: 28-March 05 From: Celbridge, Ireland Member No.: 220 |
Not joking (realy). How far is this? Look prety close though. Any notice of a side effect on power supply (clean up)? Not yet, power has just begun to climb again from the 280whr/sol low point it has been at for the past month or so to 287whr/sol on or about sol 957/958. We've had very regular power reports from Spirit over the past six weeks and there has been no evidence at all of any cleaning (yet). We'll see if the next power figures show any change but I wouldn't expect it - I think it is very unlikely that this just happened so whatever effect it would have had would already have been seen. |
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