%0 Journal Article %1 McCord1999a %A McCord, T. B. %A Hansen, G. B. %A Shirley, J. H. %A Carlson, R. W. %D 1999 %J Journal of Geophysical Research-Planets %K INFRARED MAPPING MU-M SPECTROMETER; %N E11 %P 27157--27162 %T Discussion of the 1.04-mu m water ice absorption band in the Europa NIMS spectra and a new NIMS calibration %V 104 %X Measurements made by the Galileo Near Infrared Mapping Spectrometer (NIMS) have been used to calculate reflectance spectra for regions of Europa. Many of these spectra show features indicative of water ice. Others show asymmetric H2O absorption features suggesting hydrated non-ice constituents such as hydrated sulfates and carbonates. Often, both types of features are present. However, some previously published NIMS spectra with strongly developed ice features did not show the expected 1.04-mu m ice absorption band. This discrepancy has led to questions regarding earlier interpretations of Europa's spectral features. Recent work reveals that unexpected changes have occurred in the spectral range covered by each NIMS detector and that an additional calibration is required. Preliminary calibration values are given. When this new calibration is applied, the 1.04-mu m feature emerges clearly in those spectra where it was expected but absent previously, thereby resolving the 1.04-mu m band discrepancy.

@article{McCord1999a, abstract = {Measurements made by the Galileo Near Infrared Mapping Spectrometer (NIMS) have been used to calculate reflectance spectra for regions of Europa. Many of these spectra show features indicative of water ice. Others show asymmetric H2O absorption features suggesting hydrated non-ice constituents such as hydrated sulfates and carbonates. Often, both types of features are present. However, some previously published NIMS spectra with strongly developed ice features did not show the expected 1.04-mu m ice absorption band. This discrepancy has led to questions regarding earlier interpretations of Europa's spectral features. Recent work reveals that unexpected changes have occurred in the spectral range covered by each NIMS detector and that an additional calibration is required. Preliminary calibration values are given. When this new calibration is applied, the 1.04-mu m feature emerges clearly in those spectra where it was expected but absent previously, thereby resolving the 1.04-mu m band discrepancy.}, added-at = {2009-11-03T20:21:25.000+0100}, author = {McCord, T. B. and Hansen, G. B. and Shirley, J. H. and Carlson, R. W.}, biburl = {https://www.bibsonomy.org/bibtex/2781e7272efb0c3da046ac1fc433b0176/svance}, citedreferences = {CALVIN WM, 1995, J GEOPHYS RES-PLANET, V100, P19041 ; CARLSON RW, 1992, SPACE SCI REV, V60, P457 ; CLARK RN, 1980, Icarus, V44, P388 ; CROWLEY JK, 1991, J GEOPHYS RES-SOL EA, V96, P16231 ; DALTON JB, 1998, B AM ASTRON SOC, V30, P1081 ; DALTON JB, 1998, EOS T AGU S, V79, F541 ; MCCORD TB, 1998, Science, V280, P1242 ; MCCORD TB, 1999, J GEOPHYS RES-PLANET, V104, P11827}, interhash = {23b887b07f5836bbc31d04d01c6128d7}, intrahash = {781e7272efb0c3da046ac1fc433b0176}, journal = {Journal of Geophysical Research-Planets}, keywords = {INFRARED MAPPING MU-M SPECTROMETER;}, number = {E11}, owner = {svance}, pages = {27157--27162}, timestamp = {2009-11-03T20:22:01.000+0100}, title = {Discussion of the 1.04-mu m water ice absorption band in the Europa NIMS spectra and a new NIMS calibration}, volume = 104, year = 1999 }