1.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Institute of Space and Astronautical ScienceJP1.7k papers
- The University of TokyoJP906 papers
- National Astronomical Observatory of JapanJP689 papers
- Nagoya UniversityJP477 papers
- Kyoto UniversityJP381 papers
- Goddard Space Flight CenterUS339 papers
- The Graduate University for Advanced Studies, SOKENDAIJP298 papers
- The University of OsakaJP273 papers
- Centre National de la Recherche ScientifiqueFR252 papers
- RIKENJP234 papers
- Hiroshima UniversityJP229 papers
- Tokyo Institute of TechnologyJP205 papers
223 papers · 1 filter
Cause of chromospheric opposite polarity intrusions discovered in Sunrise III/SCIP data: MURaM-ChE simulations point to twisted flux ropes
Patrick A. Ondratschek, Damien F. Przybylski, Robert H. Cameron +33
The Sunrise Chromospheric Infrared spectroPolarimeter (SCIP) instrument onboard the balloon-borne Sunrise III observatory provided new high-resolution observations of the solar chr…
Science operation, data handling, and ground support system of the SOLAR-C mission
Shin Toriumi, Mari Nishiyama, Keiichi Matsuzaki +16
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…
Pre-flare and active region plasma flows and structure seen by the short wavelength camera on SOLAR-C/EUVST
James McKevitt, Sarah Matthews, David H. Brooks +20
The mechanisms triggering solar flares and driving coronal heating occur across wide temperature ranges on small spatial scales and short timescales, making them difficult to obser…
The Sunrise Chromospheric Infrared Spectro-Polarimeter SCIP: an instrument for SUNRISE III
Y. Katsukawa, J. C. del Toro Iniesta, S. K. Solanki +54
The Sunrise balloon-borne solar observatory is equipped with a one-meter aperture optical telescope, offering a unique platform for uninterrupted seeing-free observations across ul…
JWST-DECO: Temporal Variations in the Mid-IR Silicate Features of Two T Tauri Discs Based on Spitzer and JWST observations
N. Sameshima, T. Miyata, T. Kamizuka +9
Mid-infrared spectra of planet-forming discs commonly show prominent silicate emission, whose spectral shape is sensitive to the disc temperature distribution as well as its minera…
XRISM view of a stellar flare: High-resolution Fe K spectra of HR 1099, an RS CVn-type star
Miki Kurihara, Masahiro Tsujimoto, Michael Loewenstein +21
A high-resolution X-ray spectroscopic observation was made of the RS CVn-type binary star HR 1099 using the Resolve instrument onboard XRISM for its calibration purposes. During th…
Determining the Magnetic Field in the Atmosphere of a Solar Active Region Observed by the CLASP2.1 Sounding Rocket Experiment
Ryohko Ishikawa, Javier Trujillo Bueno, David E. McKenzie +17
We determine magnetic fields from the photosphere to the upper chromosphere combining data from the Hinode satellite and the CLASP2.1 sounding rocket experiment. CLASP2.1 provided…
Observational Comparison Between Confined and Eruptive Flares: Magnetohydrodynamics Instability Parameters in a Similar Magnetic Configuration
Kouhei Teraoka, Daiki Yamasaki, Yusuke Kawabata +2
Unstable states of the solar coronal magnetic field structure result in various flare behaviors. In this study, we compared the confined and eruptive flares that occurred under sim…
The Extreme Space Weather Event of 1872 February: Sunspots, Magnetic Disturbance, and Auroral Displays
Hisashi Hayakawa, Edward W. Cliver, Frédéric Clette +19
We review observations of solar activity, geomagnetic variation, and auroral visibility for the extreme geomagnetic storm on 1872 February 4. The extreme storm (referred to here as…
Chromospheric Mg I Emission Lines of Pre-Main-Sequence Stars
Mai Yamashita, Yoichi Itoh, Yuhei Takagi
To reveal details of the internal structure, the relationship between chromospheric activity and the Rossby number has been extensively examined for main-sequence stars. For active…
Temperature and differential emission measure evolution of a limb flare on 13 January 2015
Malte Bröse, Alexander Warmuth, Taro Sakao +1
Spatially unresolved observations show that the cooling phase in solar flares can be much longer than theoretical models predict. It has not yet been determined whether this is als…
Particle acceleration in solar flares with imaging-spectroscopy in soft X-rays
Mitsuo Oka, Amir Caspi, Bin Chen +15
Particles are accelerated to very high, non-thermal energies during explosive energy-release phenomena in space, solar, and astrophysical plasma environments. In the case of solar…
From Dust to Nanodust: Resolving Circumstellar Dust from the Colliding-Wind Binary Wolf-Rayet (WR) 140
Ryan M. Lau, Jason Wang, Matthew J. Hankins +17
Wolf-Rayet (WR) 140 is the archetypal periodic dust-forming colliding-wind binary that hosts a carbon-rich WR (WC) star and an O-star companion with an orbital period of 7.93 years…
Which Component of Solar Magnetic Field Drives the Evolution of Interplanetary Magnetic Field over Solar Cycle?
Minami Yoshida, Toshifumi Shimizu, Shin Toriumi
The solar magnetic structure changes over the solar cycle. It has a dipole structure during solar minimum, where the open flux extends mainly from the polar regions into the interp…
Thermodynamic properties of small flares in the quiet Sun observed by H and EUV: plasma motion of the chromosphere and time evolution of temperature/emission measure
Yuji Kotani, Takako T. Ishii, Daiki Yamasaki +4
Small flares frequently occur in the quiet Sun. Previous studies have noted that they share many common characteristics with typical solar flares in active regions. However, their…
Magnetic Field of Solar Dark Filaments Obtained from He I 10830 Angstrom Spectro-polarimetric Observation
Daiki Yamasaki, Yu Wei Huang, Yuki Hashimoto +4
Solar filaments are dense and cool plasma clouds in the solar corona. They are supposed to be supported in a dip of coronal magnetic field. However, the models are still under argu…
The 17 April 2021 widespread solar energetic particle event
N. Dresing, L. Rodríguez-García, I. C. Jebaraj +46
Context. A solar eruption on 17 April 2021 produced a widespread Solar Energetic Particle (SEP) event that was observed by five longitudinally well-separated observers in the inner…
Direct Imaging Explorations for Companions around Mid-Late M Stars from the Subaru/IRD Strategic Program
Taichi Uyama, Charles Beichman, Masayuki Kuzuhara +32
The Subaru telescope is currently performing a strategic program (SSP) using the high-precision near-infrared (NIR) spectrometer IRD to search for exoplanets around nearby mid/late…
Reconstructing the XUV Spectra of Active Sun-like Stars Using Solar Scaling Relations with Magnetic Flux
Kosuke Namekata, Shin Toriumi, Vladimir S. Airapetian +3
Kepler Space Telescope and Transiting Exoplanet Survey Satellite unveiled that Sun-like stars frequently host exoplanets. These exoplanets are subject to fluxes of ionizing radiati…
Probability Distribution Functions of Sunspot Magnetic Flux
Takashi Sakurai, Shin Toriumi
We have investigated the probability distributions of sunspot area and magnetic flux by using the data from Royal Greenwich Observatory and USAF/NOAA. We have constructed a sample…
Radiation-driven acceleration in the expanding WR140 dust shell
Yinuo Han, Peter G. Tuthill, Ryan M. Lau +1
The Wolf-Rayet (WR) binary system WR140 is a close (0.9-16.7 mas) binary star consisting of an O5 primary and WC7 companion and is known as the archetype of episodic dust-producing…
Nested Dust Shells around the Wolf-Rayet Binary WR 140 observed with JWST
Ryan M. Lau, Matthew J. Hankins, Yinuo Han +29
Massive colliding-wind binaries that host a Wolf-Rayet (WR) star present a potentially important source of dust and chemical enrichment in the interstellar medium (ISM). However, t…
Impact of subsurface convective flows on the formation of sunspot magnetic field and energy build-up
Takafumi Kaneko, Hideyuki Hotta, Shin Toriumi +1
Strong solar flares occur in -spots characterized by the opposite-polarity magnetic fluxes in a single penumbra. Sunspot formation via flux emergence from the convection zone to…
Universal Scaling Laws for Solar and Stellar Atmospheric Heating: Catalog of Power-law Index between Solar Activity Proxies and Various Spectral Irradiances
Shin Toriumi, Vladimir S. Airapetian, Kosuke Namekata +1
The formation of extremely hot outer atmospheres is one of the most prominent manifestations of magnetic activity common to the late-type dwarf stars, including the Sun. It is wide…