TY - JOUR
T1 - New upper limits for atmospheric constituents on Io
AU - Fink, Uwe
AU - Larson, Harold P.
AU - Gautier, Thomas N.
N1 - Funding Information:
We would like to thank W. M. Sinton for helpful discussion and comparison of his 10 spectrum with ours. We also thank K. Aksnes for providing us with precise coordinates for 10 so that 10 could be tracked during daytime. This research was supported by NASA Grant NSG 7070.
PY - 1976/3
Y1 - 1976/3
N2 - A spectrum of the satellite of Jupiter, Io, from 0.86 to 2.7 μm at a resolution of 3.36 cm-1 and a signal to rms noise ratio of 120 is presented. No absorptions due to any atmospheric constituents on Io could be found on the spectrum. Upper limits of 0.12 cm-atm for NH3, 0.12cm-atm for CH4, 0.4cm-atm for N2O, and 24cm-atm for H2S were determined. Laboratory spectra of ammonia frosts as a function of temperature were compared with the spectrum of Io and showed as a frost not to be present at the surface of Io. A search for possible resonance lines of carbon, silicon, and sulfur as well as the 1.08μm line of helium proved negative and upper emission limits of 60, 18, 27, and 60 kilorayleighs, respectively, were established for these lines.
AB - A spectrum of the satellite of Jupiter, Io, from 0.86 to 2.7 μm at a resolution of 3.36 cm-1 and a signal to rms noise ratio of 120 is presented. No absorptions due to any atmospheric constituents on Io could be found on the spectrum. Upper limits of 0.12 cm-atm for NH3, 0.12cm-atm for CH4, 0.4cm-atm for N2O, and 24cm-atm for H2S were determined. Laboratory spectra of ammonia frosts as a function of temperature were compared with the spectrum of Io and showed as a frost not to be present at the surface of Io. A search for possible resonance lines of carbon, silicon, and sulfur as well as the 1.08μm line of helium proved negative and upper emission limits of 60, 18, 27, and 60 kilorayleighs, respectively, were established for these lines.
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U2 - 10.1016/0019-1035(76)90022-1
DO - 10.1016/0019-1035(76)90022-1
M3 - Article
AN - SCOPUS:49549130881
VL - 27
SP - 439
EP - 446
JO - Icarus
JF - Icarus
SN - 0019-1035
IS - 3
ER -