MSL data in the PDS and the Analyst's Notebook, Working with the archived science & engineering data |
MSL data in the PDS and the Analyst's Notebook, Working with the archived science & engineering data |
Feb 27 2013, 07:22 PM
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Solar System Cartographer Group: Members Posts: 10227 Joined: 5-April 05 From: Canada Member No.: 227 |
"February 27, 2013. MSL Release 1, part 1, Sols 0-89.
The first release of MSL data takes place in two parts. Part 1, February 27, 2013, includes raw data products (EDRs) acquired on Sols 0 through 89, August 6 through November 5, 2012, for these instruments: APXS, ChemCam, DAN, Hazcam, Navcam, and REMS, along with SPICE data. Part 2, March 20, 2013, will include the derived data products (RDRs) for Sols 0 though 89 for the APXS, ChemCam, DAN, Hazcam, Navcam, and REMS instruments, along with both the EDRs and RDRs for the CheMin and RAD instruments, and the RDRs for the SAM instrument. Release 1 does not include data from the MAHLI, MARDI, or Mastcam instruments. These instrument teams have not yet delivered data products to PDS. Some documents in the MSL archives are awaiting clearance by JPL Document Review and/or the JPL Import/Export Control Office. They will be posted online as soon as clearance has been received, and announced on this web site." Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Mar 26 2013, 11:52 AM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
You'll be close to a solution by dividing the two values, because (by gray-assumption) the emissivity cancels out, see http://en.wikipedia.org/wiki/Pyrometer.
Then by applying Planck's, or for simplicity, Wien's law you may get close to the absolute temperature, see http://en.wikipedia.org/wiki/Wien_approximation. My rough approximative ad-hoc idea is, to divide the values of Wien's (or better Planck's) law for the respective mean measured wavelengths for any given fixed temperature, and compare it with the measured quotient. More accurately, Planck's curve for a fixed temperature multiplied by the sensivity of the respective thermopile (as a function of wavelength) has to be integrated over the wavelength. The underlying principle is, that the quotient of the emissions of a black or grey body at two fixed wavelengths is temperature-dependent, and provided by Planck's law. Restricted to an appropriate temperature interval the quotient determines temperature uniquely. Some adjustment might be necessary due to IR absorption by CO2 or dust coating. This may be a second step. EDIT: By the two values I meant the sensor values as defined in raw data, B1_IR_OUT_2 and B1_IR_OUT_3, rover-induced fluctuations removed, and calibrated for power or radiance. It's not easy, nevertheless. |
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