Estimating modal abundances from the spectra of natural and laboratory pyroxene mixtures using the modified Gaussian model

1993 ◽  
Vol 98 (E5) ◽  
pp. 9075-9087 ◽  
Author(s):  
Jessica M. Sunshine ◽  
Carlé M. Pieters
Keyword(s):  
Gaussian Model ◽  
Modified Gaussian Model

scholarly journals Study of the Modified Gaussian Model on olivine diagnostic spectral features and its applications in space weathering experiments

2020 ◽  
Vol 20 (8) ◽  
pp. 129
Author(s):  
Hui-Jie Han ◽  
Xiao-Ping Lu ◽  
Ya-Zhou Yang ◽  
Hao Zhang ◽  
Admire Muchimamui Mutelo
Keyword(s):  
Gaussian Model ◽  
Space Weathering ◽  
Spectral Features ◽  
Modified Gaussian Model

Using the modified Gaussian model to extract quantitative data from lunar soils

2006 ◽  
Vol 111 (E11) ◽  
Author(s):  
Sarah K. Noble ◽  
Carlé M. Pieters ◽  
Takahiro Hiroi ◽  
Lawrence A. Taylor
Keyword(s):  
Quantitative Data ◽  
Gaussian Model ◽  
Lunar Soils ◽  
Modified Gaussian Model

Modified Gaussian model for rubber elasticity. 2. The wormlike chain

1982 ◽  
Vol 15 (2) ◽  
pp. 537-541 ◽  
Author(s):  
Jeffrey Kovac ◽  
Charles C. Crabb
Keyword(s):  
Gaussian Model ◽  
Rubber Elasticity ◽  
Wormlike Chain ◽  
Modified Gaussian Model

scholarly journals Investigation on the Absorption Bands Around 3.3 μm in CRISM Data

2020 ◽  
Author(s):  
Paola Manzari ◽  
Cosimo Marzo ◽  
Eleonora Ammannito
Keyword(s):  
Standard Deviation ◽  
Lower Limit ◽  
Gaussian Model ◽  
Depth Map ◽  
Threshold Value ◽  
Absorption Bands ◽  
Gale Crater ◽  
Methane Seepage ◽  
Modified Gaussian Model ◽  
A Site

Abstract Recently, the methane seepage detected by Mars Sample Laboratory (MSL) in the Gale crater area during 2013 was confirmed by methane detection by the Planetary Fourier Spectrometer (PFS). While analyzing NIR-IR CRISM data on a site in Oxia Planum area, in the view of a future comparison with data that will be collected by the Rosalind Franklin rover onboard the ExoMars2022 mission, a 3.3 μm absorption was noted in some pixel spectra. Since methane, like other hydrocarbons, shows absorptions in the range 3.1-3.6 μm, we begun to study this band in CRISM data to explore the possibility to look for seepages on Mars surface. The datasets chosen for this study, aside the site in Oxia Planum area, include some sites of observations on Gale Crater and other sites in Nili Fossae area. We used the Planetary Spectrum Generator to simulate CRISM spectra of the different sites, with the diverse concentrations of CH4 spikes. These simulations served to establish the relation between concentration and methane band depths, as seen by CRISM spectrometer. Then, mapping the Modified Gaussian Model fit on CRISM data, we extracted the band parameters of the absorptions in the 3.3 μm spectral region. Aside rare, suspected absorptions, an artifact was highlighted. Therefore, we have set a threshold on the depth to consider as depth of potential true absorptions, on the basis of the standard deviation (s) of absorption depth map. Finally, we concluded to favor as potential absorptions: distribution of clusters of pixels in the band mapping not vertically stacked and a threshold value >μ (average)+5σ (standard deviation) of the depth map. These threshold values set the lower limit for each observation on the methane concentration potentially detectable by CRISM. The threshold value varies from one observation to another, in a range between 0.0136-0.0237, that would correspond in a range of lower limit concentrations of 180 and 600 ppbv. We found interesting cluster of pixels which spectra overcome the imposed threshold. We still consider that part of them could still be a kind of unknown artifact. Nevertheless, the aim of this paper is to show that CRISM data can show potential absorptions of methane in such quantities that in some observations are compatible with the order of the methane spikes effectively detected in literature. Even if this work does not confirm nor deny the occurrences of methane seepages in the investigated images it shows a possible method for assessing a confidence limit in the detection of this band in CRISM data.

Assessing the limits of the Modified Gaussian Model for remote spectroscopic studies of pyroxenes on Mars

Icarus ◽  
2007 ◽  
Vol 187 (2) ◽  
pp. 442-456 ◽  
Author(s):  
Lisa C. Kanner ◽  
John F. Mustard ◽  
Aline Gendrin
Keyword(s):  
Gaussian Model ◽  
Spectroscopic Studies ◽  
Modified Gaussian Model
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