Spirit cleaner? |
Spirit cleaner? |
Jun 18 2007, 06:44 AM
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
I've been keeping an eye on the sundial images looking for signs of a cleaning event. I've noticed some changes in the latest to be downloaded although they may be due to changes in the lighting.
A : clean patch at top of circle streak at bottom B : increased contrast from dust left behind next to mirror C : clean patch next to wire Also note the missing clumps of dust on the deck A broader view show a contrast between sol 1221 and 1227 http://207.7.139.5/mars/spirit/navcam/2007...I4P0165L0M1.JPG http://207.7.139.5/mars/spirit/navcam/2007...00P1914L0M1.JPG Has anyone heard if there has been a change in the power levels? |
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Jun 28 2007, 06:36 AM
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Dublin Correspondent Group: Admin Posts: 1799 Joined: 28-March 05 From: Celbridge, Ireland Member No.: 220 |
I don't have precise data but again there are approximation formulae in "Solar Radiation on Mars - Update 1991" J. Applebaum, G.A. Landis. (NASA Technical Memorandum #105216) for both of the 1977 global storms that yield optical depths by latitude and LS. Both of these peak at around 5.
That should equate to around a 70% loss in insolation which in turn should equate to about 1.5-2 f/stops from an exposure POV. That would be noticable shouldn't have caused dramatic under/over exposure of images so I wonder if the model underestimates the values? Any ideas? |
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