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 15 2018, 12:03 PM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
If I understand it correctly, tau measurements are performed by considering only the sun or another small apparent source of light.
https://agupubs.onlinelibrary.wiley.com/doi...29/1998JE900017 Scattered light seems to be neglected. This approach tells something about the total incoming light, if tau is small. But for large values of tau, most of the light is scattered. So, it doesn't need to be much darker than it would be, if the whole sky would be as bright as the moon on Earth. More useful, in this case, would probably be the comparison of about 700 Wh with 22 Wh, which is about a factor of 34 darker than under clear sunshine. Reduce this factor a bit by the dust layer on the panels. It may still be bright enough to read newspapers easily, like on a cloudy or very cloudy day on Earth. |
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