CRISM Corner |
CRISM Corner |
Guest_AlexBlackwell_* |
Sep 28 2006, 02:14 AM
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APL-Built Mineral-Mapping Imager Begins Mission at Mars
JHU/APL For Immediate Release September 27, 2006 See also A.J.S. Rayl's story at TPS. EDIT: I changed the topic title because, as I understand it from the press release, the cover was opened, not jettisoned. This post has been edited by AlexBlackwell: Sep 28 2006, 04:48 PM |
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Guest_AlexBlackwell_* |
Dec 22 2006, 08:26 PM
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There was CRISM release today: PIA09101: Seasonal Frost in Terra Sirenum.
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Dec 22 2006, 08:45 PM
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Member Group: Members Posts: 267 Joined: 5-February 06 Member No.: 675 |
Should we be concerned about the noise in the green (1.45uM CO2 absorption) band?
Either it was a weak, therefore noisy, signal or there are some instrumentation problems with CRISM . Steve |
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Dec 22 2006, 08:58 PM
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Member Group: Members Posts: 258 Joined: 22-December 06 Member No.: 1503 |
Should we be concerned about the noise in the green (1.45uM CO2 absorption) band? Either it was a weak, therefore noisy, signal or there are some instrumentation problems with CRISM . Steve Just a thought, Could the problem be somehow related to the recent solar activity? And if it is, might it be a temporary problem? |
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Dec 22 2006, 09:11 PM
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#5
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
There's probably nothing wrong with CRISM. You can't expect s/n ratios equal to framing cameras because spectrometers split the incoming light into a huge nuber of different wavelengths that are separately detected. The total energy per wavelength slice is thus reduced. There's also the way the spectrometers are built that they can be susceptible to noise (such as lower quantum efficiencies for certain wavelengths, ccd damage, etc). If you want to see what ugly data really looks like, take a look at Cassini's VIMS visual channel products.
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