8-2. Research Centers

Center for Integrated Data Science (CIDAS)

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Center for Heliospheric Science
Research and development of advanced simulations(SUSANOO, CReSS, Monte Carlo simulations for highprecision age calculations)
Construction of various databases (IUGONET,WDS-CR)
Operation of CIDAS supercomputer system
Membership activity of HPCI consortium

The Center for Integrated Data Science (CIDAS) aimed to construct infrastructure and conduct research anddevelopment to perform a cutting-edge scientific study of the space–Earth environmental system through integrated
analyses using various observational data and advanced computer simulations. CIDAS operates many projects incooperation with ISEE research divisions and centers and other universities and institutes.

Center for Heliospheric Science: Arase, Mio, Hinode, SOLAR- C
The Center for Heliospheric Science (CHS), which is responsible for the development and release of integrated
analysis tools and data files from Arase, Mio, Hinode, and SOLAR-C, including ground-based observations andsimulations, is operated by ISEE, Nagoya University, ISAS/JAXA, and NAOJ. For this purpose, the CHS operates anIntegrated Data Science Computer System (CIDAS system) that provides an analysis environment for researchers.

Cooperative research program for database construction and supercomputing
CIDAS produces various databases for space–Earth environmental research and provides supercomputing facilities
in collaboration with the Information Technology Center of Nagoya University and other universities and institutes.
CIDAS mints DOIs for ISEE research data (DOI prefix: 10.34515) to ensure permanent accessibility and promote thereusability of the data. CIDAS has also joined the inter-university network project (Inter-university Upper atmosphere
Global Observation NETwork: IUGONET) with Tohoku University, NIPR, Kyoto University, Kyushu University, andNagoya University to develop a metadata databases server and data analysis software. CIDAS is responsible for activities
in ISEE as a member of the High-Performance Computing Infrastructure Consortium (HPCI) in Japan.

Research and development of advanced simulations
CIDAS plays a leading role in researching and developing the following advanced computer simulation models:Space Weather Forecast Usable System Anchored by Numerical Operations and Observations (SUSANOO), Cloud
Resolving Storm Simulator (CReSS), and Monte Carlo simulations for accurate Th-U-Pb dating. The CReSS model was
designed for all types of parallel computers to simulate the detailed structure of clouds and storms. CReSS is free to use
for the scientific community. It has been used for meteorological research and real-time weather forecast experiments,
such as simulation experiments of tropical cyclones, heavy rainfall events, snow clouds, tornados, and downscaling
experiments of future tropical cyclones cyclones.

66 Institute for Space–Earth Environmental Research

8-2. Research Centers

Main Activities in FY2022
Development of a data analysis system for the ERG (Arase) and Mio (BepiColmbo/MMO) project
Scientific data from the ERG (Arase) satellite, ground-network observations, and modeling/simulations were archived at the Centerfor Heliospheric Science (CHS), which is operated by ISAS/JAXA and ISEE/Nagoya University. The format of these data files is CDF,
and includes the metadata of each file. This is a de facto format in the solar–terrestrial physics community. The Space Physics Environment
Data Analysis System (SPEDAS), a commonly used software in the solar–terrestrial physics community, can easily read and manipulate
CDF files. The CHS has developed CDF files and SPEDAS plug-in software for the ERG project. We also joined the International
Heliosphere Data Environment Alliance to discuss common data formats in the international framework. The CHS has organized training
sessions for SPEDAS in Japan and Taiwan, providing important opportunities to learn to use SPEDAS and ERG data. The CHS isalso developing a data analysis environment for the CIDAS system. Users can access the CIDAS system via the internet and analyze
ERG project data using SPEDAS (https://ergsc.isee.nagoya-u.ac.jp/research/index.shtml.en). The CHS is also working fordevelopment of the Mercury magnetospheric orbiter Mio (MMO) data files and related tools based on the heritage of the ERG project.

Synthesis of infrared Stokes spectra in an evolving chromospheric jet
Chromospheric jets are believed to play an imperative role in energy and mass transfer within the solar chromosphere, although
their driving mechanisms remain unknown. Accurate measurements of magnetic fields are essential to identify these mechanisms.
We performed a full Stokes synthesis in the infrared range using a realistic radiative magnetohydrodynamic simulation to generatea chromospheric jet and predict spectropolarimetric observations from the Sunrise Chromospheric Infrared Spectropolarimeter(SCIP) aboard the SUNRISE III balloon telescope. The jet’s launch was initiated by the collision between the transition region andupflow, driven by the ascending motion of the twisted magnetic field at the flux tube’s envelope. This motion aligns with theupwardly propagating nonlinear Alfvénic waves. The upflow can be detected as continuous Doppler signals in the Ca ii 849.8 nm
line at the envelope, where the dark line core intensity and strong linear polarization coincide. The axis of the flux tube was brightin both the Fe i 846.8 and Ca ii 849.8 nm lines, with the downflow plasma inside it. Our study’s predicted structure, time evolution,and Stokes signals will enhance future spectropolarimetric observations with SUNRISE III/SCIP.

IUGONET activity
IIUGONET has been promoting the use and application of upper atmospheric observation data by providing metadata
databases and analysis tools in collaboration with other institutions (e.g., the Research Organization of Information and Systems),
and has been developing a universal infrastructure to disclose and cite data. In FY2022, the IUGONET metadata schema wasupdated, and metadata were recreated as they followed the international standard. Furthermore, we defined and implemented amapping from the metadata schema used in the field of space physics to a general schema used for academic information
distribution and converted our metadata. The converted metadata were registered in the Nagoya University institutional repository
so that research data could be searched from a vast range of communities. We also developed a web-based XML file input systemthat allows data providers to easily create metadata to mint DOI.

Operation of the CIDAS supercomputer system
A new computer system for integrated data analysis (CIDAS computer system) was installed on April 2021. Thesystem consists of 16 compute nodes, each of which has two Intel Xeon Gold 6230R CPUs and 384 GiB memory. In
FY2022, 140 researchers/students were registered as users of the CIDAS supercomputer system. Data analyses related tothe Hinode Science Center and ERG/Arase Science Center and computer simulation studies were conducted.

Development of the CReSS model
The CReSS model was developed and improved for physical processes. It is available for scientific research fromCIDAS. The CReSS model was used for the simulation experiments and daily weather forecasts. The simulated daily forecast
data were openly available from the meteorological laboratory website. CIDAS also plans to make available the simulation
output data from the CReSS model.
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