Masahiro Takayanagi

Current status of level 2 product of Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES)

New level 2 products v2.0 of JEM/SMILES are scheduled to be released in Sep., 2011. This will be the first publicreleased version. In pre-released product v1.3, positive bias of retrieved temperature in the stratosphere was the largest issue since temperature is basic parameter which characterizes the atmospheric structure. The new product use latest L1B 007 which includes gain nonlinearity effect of receivers, bias of temperature in upper stratosphere is suppressed. In addition, we stopped temperature retrieval above 40km and refer MLS temperature product with applying migrating tidal model. HCl profiles in mesosphere become constant, which supports this temperature processing.

CALET UPPER LIMITS on X-RAY and GAMMA-RAY COUNTERPARTS of GW151226

We present upper limits in the hard X-ray and gamma-ray bands at the time of the LIGO gravitational-wave event GW 151226 derived from the CALorimetric Electron Telescope (CALET) observation. The main instrument of CALET, CALorimeter (CAL), observes gamma-rays from ~1 GeV up to 10 TeV with a field of view of ~2 sr. The CALET gamma-ray burst monitor (CGBM) views ~3 sr and ~2pi sr of the sky in the 7 keV - 1 MeV and the 40 keV - 20 MeV bands, respectively, by using two different scintillator-based instruments. The CGBM covered 32.5% and 49.1% of the GW 151226 sky localization probability in the 7 keV - 1 MeV and 40 keV - 20 MeV bands respectively. We place a 90% upper limit of 2 x 10^{-7} erg cm-2 s-1 in the 1 - 100 GeV band where CAL reaches 15% of the integrated LIGO probability (~1.1 sr). The CGBM 7 sigma upper limits are 1.0 x 10^{-6} erg cm-2 s-1 (7-500 keV) and 1.8 x 10^{-6} erg cm-2 s-1 (50-1000 keV) for one second exposure. Those upper limits correspond to the luminosity of 3-5 x 10^{49} erg s-1 which is significantly lower than typical short GRBs.

The CALET, CALorimetric Electron Telescope, mission for the International Space Station

Abstract The CALorimetric Electron Telescope, CALET, mission is proposed for the Japanese Experiment Module Exposure Facility of the International Space Station. Major goals of the mission are precise measurements of the electrons in a few GeV - 10 TeV and the gamma-rays in 100 MeV - several TeV, keeping an energy resolution of a few % over 100 GeV. From the measurements, a systematic investigation of high-energy electromagnetic process in universe will be performed. A detection of SUSY particle which is a candidate of the dark matter would also be expected. The detector is composed of an imaging calorimeter of scintillating fibers and a total absorption calorimeter. Total thickness of the absorber is 45 r.1 for electro-magnetic particles and 2.1 m.f.p for protons. Total weight of the payload is nearly 2,200 kg, and the effective geometrical factor should be ∼ 1.0 m 2 sr. The hadron rejection power can be 10 6 for electrons.

The CALorimetric Electron Telescope (CALET) for high-energy astroparticle physics on the International Space Station

The CALorimetric Electron Telescope (CALET) is a space experiment, currently under development by Japan in collaboration with Italy and the United States, which will measure the flux of cosmic-ray electrons (and positrons) up to 20 TeV energy, of gamma rays up to 10 TeV, of nuclei with Z from 1 to 40 up to 1 PeV energy, and will detect gamma-ray bursts in the 7 keV to 20 MeV energy range during a 5 year mission. These measurements are essential to investigate possible nearby astrophysical sources of high energy electrons, study the details of galactic particle propagation and search for dark matter signatures. The main detector of CALET, the Calorimeter, consists of a module to identify the particle charge, followed by a thin imaging calorimeter (3 radiation lengths) with tungsten plates interleaving scintillating fibre planes, and a thick energy measuring calorimeter (27 radiation lengths) composed of lead tungstate logs. The Calorimeter has the depth, imaging capabilities and energy resolution necessary for excellent separation between hadrons, electrons and gamma rays. The instrument is currently being prepared for launch (expected in 2015) to the International Space Station ISS, for installation on the Japanese Experiment Module - Exposure Facility (JEM-EF).

Recent results from the superconducting submillimeter-wave limb-emission sounder (SMILES) onboard ISS/JEM

The Superconducting submillimeter-wave limb-emission sounder (SMILES) employs superconducting detectors mechanically cooled down to ~4K, and it is extremely sensitive (Tsys < 400K), for the weak emission from trace species of stratosphere and mesosphere, such as O3, HCl, HNO3, ClO, HO2, 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 has been observing precise spectra with ~1K noise. Level- 2 (L2) data processing is on going at ISAS/JAXA in semi-real time basis. O3, HCl, HNO3 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. HO2 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 challenging. This paper describes L2 processing at ISAS/JAXA and early results of SMILES.

Particle temperature measurement using pair distribution function in complex plasmas

In order to obtain more reliable particle temperature of complex plasmas, a new method of obtaining it in a solid phase is investigated. Since a conventional method uses a velocity distribution function (VDF), both high spacial resolution and sufficiently large observation area are required for sufficient measurement accuracy. It is often difficult, however, to satisfy them simultaneously due to necessities of highly magnified observation for the former requirement and low magnified one for the latter one. Therefore, we investigate another method of estimating particle temperature in the solid phase by use of a pair distribution function (PDF). This method has a feature that only one observation magnification is required. From comparison between the experimentally obtained PDFs and calculated ones, mean square displacement (MSD) is determined. The temperature is estimated by using the MSD if the particle motion is regarded as harmonic oscillation. It is found that the obtained temperature from the PDF is consistent with that from the VDF.

Search for GeV Gamma-ray Counterparts of Gravitational Wave Events by CALET

We present results on searches for gamma-ray counterparts of the LIGO/Virgo gravitational-wave events using CALorimetric Electron Telescope ({\sl CALET}) observations. The main instrument of {\sl CALET}, CALorimeter (CAL), observes gamma-rays from

CAET Mission on the ISS

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Overview and early results of the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES)

GeV up to 10 TeV with a field of view of nearly 2 sr. In addition, the {\sl CALET} gamma-ray burst monitor (CGBM) views

The Level 2 research product algorithms for the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES)

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