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: 10226 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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Jul 28 2013, 03:32 AM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Here an annotated version of the Ekwir_1 APXS spectrum:
I've been trying to find the most plausible x-ray emission lines the above spectrum is composed of without using sophisticated optimization software. It may provide a rough idea of how APXS data can be analysed. Besides the K-alpha spectral line the K-beta line(s) occur, particularly for calcium (Ca) and iron (Fe). For the peaks between 4.6 and 5.0 keV I didn't find a fully plausible explanation; the peak near 22.2 keV is close to K-alpha of silver, and occurs also in pure SiO2 calibration data. For Rayleigh and Compton backscattered x-rays plutonium emission lines are relevant, because curium used by APXS decays (partly) to excited plutonium, which releases x-ray photons when returning to the ground state. The Rayleigh component occurs close to the originally emitted photon energy, the associated Compton spectrum is in an energy range a little below. A summary of APXS as used by MSL can be found in the MSL science corner. Detailed data about X-ray transition energies can be queried via NIST. Technical and physical background about X-ray spectroscopy can be found in this IAEA paper. This LPSC 2008 paper provides an idea of how light elements can be inferred by comparing Rayleigh with corresponding Compton backscattering when the preliminary elementary composition is known. The recommended document for APXS calibration is behind the paywall. |
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