S. Masuda

Characteristics of geomagnetic solar flare effects from the 2024 X-class flares and the influence of local current systems

Ryosuke Okubo, K. Watanabe, Sinnosuke Kitajima, S. Masuda et autres

Solar flares can cause fluctuations in the Earth's magnetic field, known as the solar flare effect (SFE). However, their impact on the geomagnetic field is highly complex and exhibits regional dependence, and its characteristics have not been established. Many X-class flares occurred …

jp (code pays fourni par la source)

Statistical analysis to investigate the characteristics of Sq and SFE current using the Kakioka magnetometer

Ryosuke Okubo, K. Watanabe, S. Masuda, A. Ieda

Abstract The solar flare effect (SFE) is a transient geomagnetic variation caused by a sudden increase in solar electromagnetic radiation. Although soft X-rays have traditionally been considered the primary driver, the contribution of extreme ultraviolet (EUV) radiation and its temporal evolution remain …

jp (code pays fourni par la source)

Nonthermal Sources from Stereoscopic Hard X-Ray and Earth-based Microwave Observations in a Data-constrained Magnetohydrodynamic Simulation

Keitarou Matsumoto, Satoshi Inoue, Meiqi Wang, Bin Chen et autres

Abstract We analyze the X7.1 flare on 2024 October 1 from NOAA AR 13842 using hard X-ray (HXR) imaging, microwave observations by the Expanded Owens Valley Solar Array (EOVSA), and a three-dimensional magnetohydrodynamic (MHD) simulation. The flare was observed from two vantage …

us, jp, ch (code pays fourni par la source)

Science operation, data handling, and ground support system of the SOLAR-C mission

Shin Toriumi, Mari Nishiyama, Keiichi Matsuzaki, Toshifumi Shimizu et autres

SOLAR-C is an international solar-observing satellite mission led by Japan Aerospace Exploration Agency (JAXA). It aims to elucidate mass and energy transport in solar atmospheres through extreme ultraviolet (EUV) spectroscopy. The mission carries the EUV High-throughput Spectroscopic Telescope (EUVST) and the Solar …

jp (code pays fourni par la source)

Stereoscopic Observations of Solar X-Ray Sources Explained by a Data-constrained Magnetohydrodynamic Simulation

Keitarou Matsumoto, Satoshi Inoue, Meiqi Wang, Sam Krucker et autres

We investigated the three-dimensional (3D) magnetic structures and dynamics responsible for particle acceleration in an X7.1-class flare that occurred on 2024 October 1, in NOAA active region 13842. We combined stereoscopic hard X-ray (HXR) observations from the Advanced Space-based Solar Observatory/Hard X-ray …

Generating High-Level Test Cases from Requirements Using LLM: an Industry Study

S. Masuda, Satoshi Kouzawa, Kyousuke Sezai, Hidetoshi Suhara et autres

Currently, generating high-level test cases de-scribed in natural language from requirement documents is performed manually. In the industry, including companies spe-cializing in software testing, there is a significant demand for the automatic generation of high-level test cases from requirement documents using Large …

jp (code pays fourni par la source)

Microwave Bright Points with Multiple Periodic Oscillations in the Solar Polar Coronal Hole during Solar Cycle Minimum

Jing Huang, S. Masuda, Baolin Tan, Yin Zhang et autres

Abstract During solar cycle minimum, polar coronal holes show a prominent radio brightening cap. The analysis of polar microwave enhanced radiation in polar coronal holes is helpful for understanding the magnetic field characteristics and the origin of the solar wind. Using the …

Observation of Solar Neutron Decay Protons by the International Solar Neutron Detection Network

Y. Muraki, R. Buetikofer, T. Karapetyan, S. Masuda et autres

Possibly, in association with a large solar flare on May 27th of 2024 (start time 06:57UT), the solar neutron detector located at Mt. Chacaltaya (5,250m a.s.l.) detected an enhancement with 11.5 sigma in the counting rate. Taking into account the local time …

mx (code pays fourni par la source)

Comparison of Polar Magnetic Fields Derived from MILOS and MERLIN Inversions with Hinode/SOT-SP Data

Masahito Kubo, Daikou Shiota, Yukio Katsukawa, M. Shimojo et autres

The detailed investigation of the polar magnetic field and its time evolution is one of the major achievements of Hinode. Precise measurements of the polar magnetic field are essential for understanding the solar cycle, as they provide important constraints for identifying the …

Comparison of Polar Magnetic Fields Derived from MILOS and MERLIN Inversions with Hinode/SOT-SP Data

Masahito Kubo, Daikou Shiota, Yukio Katsukawa, M. Shimojo et autres

jp, se, es, us (code pays fourni par la source)

Dynamic Motion of Microwave Bursts during a Solar Limb Flare

Sujin Kim, Jeongwoo Lee, Sung‐Hong Park, Su‐Chan Bong et autres

Abstract The SOL2013-10-28T02:02:58L133C110 flare occurred on the western limb, acquiring the GOES class of X1.0, and we focus on an oscillatory phenomenon detected at 34 GHz by the Nobeyama Radioheliograph (NoRH) during this flare. The oscillation is less obvious at 17 GHz …

kr, us, jp (code pays fourni par la source)

Development and quality control of PMT modules for the large-sized telescopes of the Cherenkov Telescope Array Observatory

T. Saito, Mitsunari Takahashi, Yusuke Inome, Hidetarô Abe et autres

International audience

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