Abstract
ABSTRACT The Superconducting submillimeter-wave limb-emission sounder (SMILES) employs superconducting detectors mechanically cooled down to ~4K, and it is extremely sensitive ( T sys < 400K), for the weak em ission from trace species of stratosphere and mesosphere, such as O 3 , HCl, HNO 3 , ClO, HO 2 , and BrO. SMILES was launched onboard HTV spacecraft by using H-IIB launcher and started atmospheric observation in autumn of 2009. Using 2 bands among 3 bands in the 625 and 650 GHz submillimeter region, SMILES ha s been observing precise spectra with ~1K noise. Level-2 (L2) data processing is on going at ISAS/JAXA in semi-real time basis. O 3 , HCl, HNO 3 and ClO have strong emission signal in the SMILES frequency coverage and we already found that SMILES L2 data is comparable or even better than the existing best satellite observation of the atmosphere. HO 2 and BrO have been retrieved with single scan data successfully and the results are under verification. Since SMILES observation is much better than any previous observation, validation of SMILES L2 data will be challe nging. This paper describes L2 processing at ISAS/JAXA and early results of SMILES. Keywords: submillimeter wave, limb sounding, atmospheric chemistry, stratospheric ozone, International Space Station, Japanese Experiment Module
Published Version
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