Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG36] Satellite Earth Environment Observation

Thu. May 24, 2018 1:45 PM - 3:15 PM International Conference Room (IC) (2F International Conference Hall, Makuhari Messe)

convener:Riko Oki(Japan Aerospace Exploration Agency), Yoshiaki HONDA(Center for Environmental Remote Sensing, Chiba University), Yukari Takayabu(東京大学 大気海洋研究所, 共同), Tsuneo Matsunaga(Center for Global Environmental Research and Satellite Observation Center, National Institute for Environmental Studies), Allen HL Huang (University of Wisconsin Madison), Chairperson:Matsunaga Tsuneo

2:45 PM - 3:00 PM

[ACG36-23] Band selection of SMILES-2 and its whole atmosphere observation

*Makoto Suzuki1, Naohiro Manago1, Satoshi Ochiai2, Philippe Baron2 (1.Institute for Space and Astronautical Sciences, Japan Aerospace Exploration Agency, 2.National Institute of Information and Communications Technology)

Keywords:Horizontal wind, Temperature, Stratosphere, Lower thermosphere, Atmospheric chemistry, Whole atmosphere meteorological observation

SMILES-2 is one of the satellite proposal submitted to JAXA/ISAS small satellite program in January 2018, and it is waiting for the first selection scheduled in June 2018 (3 proposals can go to phase-A among 8 proposals. If it is selected, 2022/23 launch is expected). SMILES-2 satellite proposal is 600 km, 66 degree, 550 kg satellite carrying SMILES-2 (core instrument), in-situ instruments for ionosphere (Langmuir Probe and Ion Drift Analyzer) and GPS occultation (stratospheric temperature and ionosphere electron density) (Ochiai et al, 2017). SMILES-2 will be similar to ISS/JEM/SMILES, with adding 2-3 sub-mm bands using SIS mixer and THz band (1.8 THz for OH, HO2, and O3, and 2.0 THz for O atom) using HEB (Hot Electron Bolometer).

SMILES-2 program has four science objectives: (MO.1) To investigate the 4-D space-time structure of the diurnal variations (atmospheric tides) in view of dynamics, chemistry, and electromagnetic processes. (MO.2) To unveil the vertical propagation of planetary scale disturbances from the middle atmosphere (non-migrating tides and stratospheric sudden warming events) to the upper atmosphere. (MO.3) To understand atmospheric variations due to electromagnetic energy input from the magnetosphere (particle precipitation and magnetic storm). (MO.4) To provide benchmarks for whole atmosphere models and climate models with detailed description of the background thermal structure and distribution of minor species.

Previously, SMILES-2 was to have 3 sub-mm bands (LO=507 GHz, 566.5 GHz, and 638.075 GHz). After preliminary satellite design study, we should reduce sub-mm antenna size (80-100 cm down to 75 cm) and minimize the size of 4K cooled part. By choosing higher frequency band (LO=763.5 GHz), we concluded almost same (or better) sensitivity other than CO and BrO with (LO=638.075 GHz, and 763.5 GHz). Expected SMILES-2 data are: Horizontal wind (30-150 km), Temperature (15-150 km), O3, all O3 isotopes, O atom (80-150 km), H2O (20-100 km), HO2, OH, HCl, ClO, HOCl, BrO, N2O, NO, NO2, HNO3, CH3CN, HCN, and volcanic enhanced SO2.