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First Observation Data from the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES)

First Observation Data from the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES). M. Shiotani (Kyoto Univ.), M. Takayanagi (JAXA), Y. Murayama (NICT), M. Koike (Univ. of Tokyo), K. Kikuchi (JAXA), Y. Kasai (NICT), T. Nagahama (Nagoya Univ.), T. Sano (JAXA), SMILES mission team.

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First Observation Data from the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES)

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  1. First Observation Data from the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) M. Shiotani (Kyoto Univ.), M. Takayanagi (JAXA), Y. Murayama (NICT), M. Koike (Univ. of Tokyo), K. Kikuchi (JAXA), Y. Kasai (NICT), T. Nagahama (Nagoya Univ.), T. Sano (JAXA), SMILES mission team

  2. JEM/SMILES Mission (JEM/SMILES: Superconducting Submillimeter-Wave Limb-Emission Sounder designed to be aboard the Japanese Experiment Module on ISS) [Standard Products] • 1 scan： O3, HCl, ClO, CH3CN, O3 isotopes, HOCl, HNO3 • Multi-scan：HO2, BrO [Research Products] volcanic SO2, H2O2, UTH, Cirrus Clouds 1. Demonstration of superconductive mixer and 4-K mechanical cooler for the submillimeter limb-emission sounding in space [Mechanical Cooler] Two-stage Stirling and J-T; 20mW @4K, 200mW @20K, 1000mW @100K; Power Consumption: <300 W; Mass: 90 kg [SIS Mixer] RF: 640 GHz, IF: 11-13 GHz; Junction: Nb/AlOx/Nb, ~7 kA/cm2; Fabricated at Nobeyama RO 2. Observation on atmospheric minor constituents in the stratosphere

  3. JEM/SMILES Payload • Antenna: 40 cm x 20 cm • Weight: < 500 kg • Mission Life: 1 year SMILES The SMILES was carried by the H-IIB with the H-II Transfer Vehicle (HTV) (Sep. 11); the HTV was attached to the ISS (Sep. 18); the SMILES was attached to the JEM (Sep. 25) (All dates in JST)

  4. SMILES Observation ISS orbit (blue) and SMILES observation points (red) • High sensitivity in detecting atmospheric limb emission of the submillimeter wave range (640GHz) • Vertical profiling (about 3km resolution) from JEM/ISS with latitudinal coverage of 65N to 38S • Measurements on several radical species crucial to the ozone chemistry (normal O3, isotope O3, ClO, HCl, HOCl, BrO, HO2 …) • Seeking possible collaboration with validation sites where coordinated measurements can be done. SMILES observation performance

  5. Test observation by SMILES • September 26: Main power on – checkout of the hardware • September 28: Cooler attained 4K • October 10: First manual observations (only a few profiles were available) • October 12: Started continuous observations though still in c/o phase (up October 17) • October 22: Restarted test observations

  6. Band A spectrum

  7. Band B Spectrum

  8. BandC Spectrum

  9. Retrieval examaple for O3

  10. Retrieval example for HCl

  11. Ozone distribution at 28km

  12. Lat.-height section of zonal-mean O3

  13. Comparison with MLS O3

  14. Lat.-height section of zonal-mean ClO

  15. Lat.-height section of zonal-mean HCl

  16. Lat.-height section of zonal-mean BrO

  17. SUMMARY • SMILES was successfully attached to ISS, and got 4K stage without any big hardware problem. • It has been performing very well as expected. • Reasonable retrieval results are coming out. • We need further comparison with reference data and validation data to derive more stable and confident retrieval results.

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