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 16 2018, 01:13 AM
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#2
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Senior Member Group: Members Posts: 1057 Joined: 17-February 09 Member No.: 4605 |
As siravan noted the spectrum at the surface would be skewed towards the red. The spectral response of Opportunities solar cells extends into the near infrared and it would not surprise if this is where the remnant charge is coming from. While comparing Earth to Mars is a bit chalk and cheese the attached link shows the effect on visible light of a dust storm in my old stamping ground. https://www.youtube.com/watch?v=BrlD22HwPvI
The descriptions of current (human) visibility on Mars as a cloudy day may be a trifle optimistic, even given the range of visibility of the human eye: |
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Jun 16 2018, 01:30 PM
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#3
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Martian Photographer Group: Members Posts: 353 Joined: 3-March 05 Member No.: 183 |
The descriptions of current (human) visibility on Mars as a cloudy day may be a trifle optimistic Not sure what is meant. The chart describes a factor of ~30 below full sun (ok, a factor of 60 below given Mars-Sun distance) as 'near windows'. Moreover, overcast days on Earth literally have optical depth >10 quite frequently (well, frequency is location dependent, but I grew up in Seattle). If blue is the limiting factor for the triple junction cells (per siravan), the light providing array energy cannot be all IR; frankly, there should be more red light available than IR (per unit wavelength) given the Sun's spectrum and the albedo of dust in the red. |
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Jun 16 2018, 11:30 PM
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#4
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
If blue is the limiting factor for the triple junction cells (per siravan) Another point is that if blue limits the power, and the sky is very red, then estimates of the overall brightness on the ground based on the 22/700 ratio will be underestimates, due to the extra red light not contributing to array power. Probably not a huge factor, though. |
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