Dust Storm- Opportunity EOM, the end of the beginning of a new era in robotic spaceflight |
Dust Storm- Opportunity EOM, the end of the beginning of a new era in robotic spaceflight |
Jun 5 2018, 03:05 PM
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#1
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
Expect a quiet few sols - http://www.lpl.arizona.edu/~lemmon/mars-tau-b.html
SOL TAU 5097 0.65 5098 0.64 5099 0.67 5100 0.64 5101 0.60 5102 0.60 5103 0.61 5104 1.55 5105 **** 5106 2.12 |
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Jun 11 2018, 07:32 PM
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#2
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Martian Photographer Group: Members Posts: 353 Joined: 3-March 05 Member No.: 183 |
I suppose since the news is here, it is on the plot here.
I did a very simple 2-stream model, and you can approximate total insolation (proportional to array W-hrs/sol) as varying with exp(-tau*gamma), where gamma is 0.35-0.40 or so. If you compare two sols, that's exp(-delta_tau*gamma). A lot of the extinction goes into sky light, but total light is still much reduced. At these taus, tilt is a small perturbation, I'd guess. (A chunk of sky is blocked, but that chunk is the source of a small fraction of light, and the tilt hasn't changed.) |
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Jun 11 2018, 07:47 PM
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#3
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
A lot of the extinction goes into sky light, but total light is still much reduced. I guess there isn't much data from the ground during dust storms to say very accurately how much reduced the total light is. Technically the tau itself tells you how much darker the sun has become, but as Deimos says some of that will be scattered to the ground via the sky. Anyway of course we don't need to do full scattering calculations, since what really matters is array power, which is known (if not publicly). |
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