Philip R. Christensen
Arizona State University
366 Papers
2.9K Citations
Philip R. Christensen is an academic researcher from Arizona State University. The author has contributed to research in topics: Mars Exploration Program & Thermal Emission Spectrometer. The author has an hindex of 98, co-authored 358 publications. Previous affiliations of Philip R. Christensen include Goddard Space Flight Center.
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Papers
Global mapping of Martian hematite mineral deposits: Remnants of water‐driven processes on early Mars
Philip R. Christensen,Richard V. Morris,Melissa D. Lane,Joshua L. Bandfield,Joshua L. Bandfield,Michael C. Malin +5 more
TL;DR: In this article, the authors argue that these hematite deposits have formed by a process involving chemical precipitation from aqueous fluids, under either ambient or hydrothermal conditions, and provide evidence that liquid water has been stable at or near the surface for millions of years by analogy with terrestrial iron formations, in specific locations on early Mars.
Thermal emission from particulate surfaces : a comparison of scattering models with measured spectra
TL;DR: In this paper, the Mie/Conel model was used for single scattering by spheres and inputs those results into the multiple scattering formalism of Hapke's emission theory.
Detection of crystalline hematite mineralization on Mars by the Thermal Emission Spectrometer: Evidence for near‐surface water
Philip R. Christensen,Joshua L. Bandfield,Roger N. Clark,Kenneth S. Edgett,Victoria E. Hamilton,Todd M. Hoefen,Hugh H. Kieffer,Ruslan O. Kuzmin,Melissa D. Lane,Michael C. Malin,Richard V. Morris,John C. Pearl,R. Pearson,Ted L. Roush,Steven W. Ruff,M. D. Smith +15 more
TL;DR: In this paper, the TES instrument on the Mars Global Surveyor (MGS) mission has discovered a remarkable accumulation of crystalline hematite ((alpha-Fe2O3) that covers an area with very sharp boundaries approximately 350 by 350-750 km in size centered near 2 S latitude between 0 and 5 W longitude (Sinus Meridiani).
Hematite spherules at Meridiani: results from MI, Mini-TES, and Pancam
Wendy M. Calvin,J. D. Shoffner,Jeffrey R. Johnson,Andrew H. Knoll,J. M. Pocock,S. W. Squyres,Catherine M. Weitz,Raymond E. Arvidson,James F. Bell,Philip R. Christensen,P. A. de Souza,William H. Farrand,Timothy D. Glotch,Kenneth E. Herkenhoff,Bradley L. Jolliff,A. T. Knudson,Scott M. McLennan,A. D. Rogers,S. D. Thompson +18 more
TL;DR: In this paper, the authors report on observations of hematite-bearing spherules at Meridiani Planum made using the Microscopic Imager (MI), Mini-Thermal Emission Spectrometer (Mini-TES), and Panoramic Camera (Pancam) instruments on the Mars Exploration Rover Opportunity.
Regional dust deposits on Mars - Physical properties, age, and history
TL;DR: In this paper, a description of the use of infrared thermal mapper (IRTM), earth-based radar, and visual observations for the study of the existence of regional dust deposits is presented.