Shuji Abe

Kyushu University

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ТУ

Т. Уозуми

Kyushu University

Akimasa Yoshikawa

Kyushu University

Atsuki Shinbori

Nagoya University

S. Ueno

Ryukoku University

Yoshimasa Tanaka

National Institute of Polar Research

Yukinobu Koyama

National Institute of Technology, Oita College

Norio Umemura

Nagoya University

Tomoaki Hori

Nagoya University

K. Yumoto

Kyushu University

Akiko Fujimoto

Osaka Institute of Technology

Cooperative Institutions

Nagoya University

Kyushu University

Kyoto University

Tohoku University

University of California, Berkeley

John Wiley & Sons (United States)

The University of Tokyo

Goddard Space Flight Center

Charles River Laboratories (Netherlands)

Japan Aerospace Exploration Agency

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Research Field

Observation on Geomagnetic Field from MAGDAS (PEN) and INTERMAGNET (DAL) Stations in Equatorial Region

S. Selvakone Siti Hajar Yusoff Nur Awatiff Mohamad Rizal Nasriah Zakaria Akimasa Yoshikawa

International Real-Time Magnetic Observatory Network (INTERMAGNET) and Magnetic Data Acquisition System (MAGDAS) are ground-based magnetometer networks developed to study the space weather and monitor the geomagnetic variations. A MAGDAS-II type magnetometer was installed at Penang recently for seismic monitoring. The MAGDAS (PEN) station is newly established, the reliability of the magnetometer had to be tested. The test is conducted by comparing its data with geomagnetic data obtained from another well-established magnetometer system. Therefore, this research is conducted to study the reliability of the newly installed MAGDAS system by comparing geomagnetic data with the INTERMAGNET system. The closest INTERMAGNET station that was chosen for this study is Dalat, Vietnam. The available data from November 2019 to July 2020 are selected to analyse the geomagnetic components H, D, and Z variations obtained from both stations. The result of the variations will be discussed briefly in the result and discussion part of this paper. The variations of the geomagnetic component of the newly installed MAGDAS magnetometer are verified to be reliable data for the geomagnetic field monitoring.

Space Weather

10.1109/iconspace53224.2021.9768740

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Evaluation of Space Debris Mitigation Measures Using a Debris Evolutionary Model

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES AEROSPACE TECHNOLOGY JAPAN (2018)

Satomi Kawamoto Takayuki Hirai Shiki Kitajima Shuji Abe Toshiya Hanada

Debris mitigation measures such as post-mission disposal (PMD) were set by considering the effects thereof using a debris evolutionary model. Many small satellites have recently been deployed in orbit and various plans are proposed for a so-called mega-constellation consisting of thousands of satellites in Low Earth Orbit (LEO). New systems such as an electric propulsion system and air drag augmentation devices are also proposed for satellite de-orbit. Therefore, the impact of them must be discussed in order to preserve the space environment. This study evaluates the debris mitigation measures taken by using the Near-Earth Orbital Debris Environment Evolutionary Model (NEODEEM) that was jointly developed by Kyushu University and JAXA. It revealed that mega-constellations have much impacts on the debris environment, and that the future environment will be affected by the PMD compliance rate and how PMD is achieved.

10.2322/tastj.16.599

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Citations (10)

Empirical models of Total Electron Content based on functional fitting over Taiwan during geomagnetic quiet condition

Annales Geophysicae (2009)

Yoshihiro Kakinami C. H. Chen Jann‐Yenq Liu Koichiro Oyama Wen‐Hsi Yang

Abstract. Empirical models of Total Electron Content (TEC) based on functional fitting over Taiwan (120° E, 24° N) have been constructed using data of the Global Positioning System (GPS) from 1998 to 2007 during geomagnetically quiet condition (Dst>−30 nT). The models provide TEC as functions of local time (LT), day of year (DOY) and the solar activity (F), which are represented by 1–162 days mean of F10.7 and EUV. Other models based on median values have been also constructed and compared with the models based on the functional fitting. Under same values of F parameter, the models based on the functional fitting show better accuracy than those based on the median values in all cases. The functional fitting model using daily EUV is the most accurate with 9.2 TECu of root mean square error (RMS) than the 15-days running median with 10.4 TECu RMS and the model of International Reference Ionosphere 2007 (IRI2007) with 14.7 TECu RMS. IRI2007 overestimates TEC when the solar activity is low, and underestimates TEC when the solar activity is high. Though average of 81 days centered running mean of F10.7 and daily F10.7 is often used as indicator of EUV, our result suggests that average of F10.7 mean from 1 to 54 day prior and current day is better than the average of 81 days centered running mean for reproduction of TEC. This paper is for the first time comparing the median based model with the functional fitting model. Results indicate the functional fitting model yielding a better performance than the median based one. Meanwhile we find that the EUV radiation is essential to derive an optimal TEC.

International Reference Ionosphere

Root mean square

QUIET

Empirical modelling

10.5194/angeo-27-3321-2009

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Citations (30)

Characteristics of Schumann Resonance Parameters at Kuju Station

E3S Web of Conferences (2017)

Akihiro Ikeda Т. Уозуми Akimasa Yoshikawa Akiko Fujimoto Shuji Abe

The ground magnetic field variation in the extremely low frequency (ELF) range has been measured by an induction magnetometer at Kuju, Japan (KUJ; M.Lat. = 23.4 degrees, M. Lon. = 201.0 degrees) since 2003. The first mode of the Schumann resonance (SR) around 8 Hz can be seen at KUJ. The SR in H (horizontal northward component) shows maximum peaks around 08 UT and 15 UT. In the case of D (horizontal eastward component), the SR shows its maximum peak around 08 UT. These peaks are coincident with the enhancement of lightning activity in Africa and Asia. Thus, we found the influence of the lightning activity on the observed SR at KUJ.

Schumann resonances

Lightning

10.1051/e3sconf/20172001004

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Citations (2)

Development Of Eej Model Based On Dense Ground-based Magnetometer Array

AGU Fall Meeting Abstracts (2016)

H. Matsushita Akimasa Yoshikawa Т. Уозуми Akihiro Fujimoto Shuji Abe

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Distribution of polar upper atmospheric data and promotion of polar science by the IUGONET project

Hiroo Hayashi Yoshimasa Tanaka Tomoaki Hori Yukinobu Koyama Atsuki Shinbori

Promotion (chess)

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Comparison of the equivalent doses of the eye lenses, thyroid, and mammary gland among three pediatric and one adult anthropomorphic phantom during the chest CT examinations using a 40 mm volume helical scan

Radiation Protection Dosimetry (2024)

Takanori Masuda Masao Kiguchi Chikako Fujioka Takayuki Oku Toru Ishibashi

Abstract Equivalent doses for the eye lenses, thyroid, and mammary glands were measured and compared between one adult and three pediatric anthropomorphic phantoms during chest computed tomography (CT) using 40 mm volume helical scan on the Aquilion ONE GENESIS Edition CT equipment. Placing an optically stimulated luminescence dosemeter (OSLD) on the eye lenses, thyroid, and mammary gland, we measured and compared the equivalent dose of OSLD among different phantoms during chest CT using a helical scan. Compared with adults, the equivalent doses to the eye lens, thyroid, and mammary glands were ~81%, 77%, and 63% lower in newborns, 1-year-olds, and 5-year-olds using comparable image noise during chest CT.

Eye lens

10.1093/rpd/ncae165

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Inter-University upper Atmosphere Global Observation Network (IUGONET)

Data Science Journal (2013)

Hiroo Hayashi Yukinobu Koyama Tomoaki Hori Yoshimasa Tanaka Shuji Abe

The CODATA Data Science Journal is a peer-reviewed, open access, electronic journal, publishing papers on the management, dissemination, use and reuse of research data and databases across all research domains, including science, technology, the humanities and the arts. The scope of the journal includes descriptions of data systems, their implementations and their publication, applications, infrastructures, software, legal, reproducibility and transparency issues, the availability and usability of complex datasets, and with a particular focus on the principles, policies and practices for open data.All data is in scope, whether born digital or converted from other sources.

Scope (computer science)

Implementation

Digital Preservation

Open Science

10.2481/dsj.wds-030

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Citations (51)

IUGONET activities for data sharing and interdisciplinary study

Japan Geoscience Union (2016)

Yoshimasa Tanaka Norio Umemura Shuji Abe Atsuki Shinbori Yukinobu Koyama

Data Sharing

Source