98 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Kyoto UniversityJP18 papers
- The University of OsakaJP8 papers
- Rutherford Appleton LaboratoryGB7 papers
- National Astronomical Observatory of JapanJP5 papers
- Science and Technology Facilities CouncilGB5 papers
- The University of TokyoJP4 papers
- Institute of Space and Astronautical ScienceJP3 papers
- Japan Aerospace Exploration AgencyJP3 papers
- Kobe UniversityJP3 papers
- Nagoya UniversityJP3 papers
- Tohoku UniversityJP3 papers
- Japan Society for the Promotion of ScienceJP2 papers
18 papers
The Earliest Candidates of Auroral Observations in Assyrian Astrological Reports: Insights on Solar Activity around 660 BCE
Hisashi Hayakawa, Yasuyuki Mitsuma, Yusuke Ebihara +1
Auroral records found in historical archives and cosmogenic isotopes found in natural archives have served as sound proxies of coronal mass ejections (CMEs) and solar energetic par…
Temporal and Spatial Evolutions of a Large Sunspot Group and Great Auroral Storms around the Carrington Event in 1859
Hisashi Hayakawa, Yusuke Ebihara, David M. Willis +10
The Carrington event is considered to be one of the most extreme space weather events in observational history within a series of magnetic storms caused by extreme interplanetary c…
Multiple Boris integrators for particle-in-cell simulation
Seiji Zenitani, Tsunehiko N Kato
We construct Boris-type schemes for integrating the motion of charged particles in particle-in-cell (PIC) simulation. The new solvers virtually combine the 2-step Boris procedure a…
Intense geomagnetic storm during Maunder minimum possibly by a quiescent filament eruption
Hiroaki Isobe, Yusuke Ebihara, Akito D. Kawamura +2
The sun occasionally undergoes the so-called grand minima, in which its magnetic activity, measured by the number of sunspots, is suppressed for decades. The most prominent grand m…
Evaluation of plasma properties from chorus waves observed at the generation region
Lilla Juhász, Yoshiharu Omura, János Lichtenberger +1
In this study we present an inversion method which provides thermal plasma population parameters from characteristics of chorus emissions only. Our ultimate goal is to apply this m…
Low-Latitude Aurorae during the Extreme Space Weather Events in 1859
Hisashi Hayakawa, Yusuke Ebihara, David P. Hand +4
The Carrington storm (September 1/2, 1859) is one of the largest magnetic storms ever observed and it has caused global auroral displays in low-latitude areas, together with a seri…
On the Boris solver in particle-in-cell simulation
Seiji Zenitani, Takayuki Umeda
A simple form of the Boris solver in particle-in-cell (PIC) simulation is proposed. It employs an exact solution of the Lorentz-force part, and it is equivalent to the Boris solver…
Sporadic Aurora near Geomagnetic Equator: In the Philippines, on 27 October 1856
Hisashi Hayakawa, José. M. Vaquero, Yusuke Ebihara
While low latitude auroral displays are normally considered to be a manifestation of magnetic storms of considerable size, Silverman (2003, JGR, 108, A4) reported numerous "sporadi…
A Great Space Weather Event in February 1730
Hisashi Hayakawa, Yusuke Ebihara, José M. Vaquero +9
Aims. Historical records provide evidence of extreme magnetic storms with equatorward auroral extensions before the epoch of systematic magnetic observations. One significant magne…
The Great Space Weather Event during February 1872 Recorded in East Asia
Hisashi Hayakawa, Yusuke Ebihara, David M. Willis +9
The study of historical great geomagnetic storms is crucial for assessing the possible risks to the technological infrastructure of a modern society, caused by extreme space-weathe…
Dayside magnetospheric and ionospheric responses to a foreshock transient on June 25, 2008: 2. 2-D evolution based on dayside auroral imaging
Boyi Wang, Yukitoshi Nishimura, Heli Hietala +8
The foreshock region involves localized and transient structures such as foreshock cavities and hot flow anomalies due to solar wind-bow shock interactions, and foreshock transient…
Records of Sunspots and Aurora Candidates in the Chinese Official Histories of the Yuán and Míng Dynasties during 1261-1644
Hisashi Hayakawa, Harufumi Tamazawa, Yusuke Ebihara +4
Records of observations of sunspots and auroras in pre-telescopic historical documents provide useful information about past solar activity both in long-term trends and short-term…
Electron dynamics surrounding the X-line in asymmetric magnetic reconnection
Seiji Zenitani, Hiroshi Hasegawa, Tsugunobu Nagai
Electron dynamics surrounding the X-line in magnetopause-type asymmetric reconnection is investigated using a two-dimensional particle-in-cell simulation. We study electron propert…
Magnetohydrodynamic Simulation Code CANS+: Assessments and Applications
Yosuke Matsumoto, Yuta Asahina, Yuki Kudoh +7
We present a new magnetohydrodynamic (MHD) simulation code with the aim of providing accurate numerical solutions to astrophysical phenomena where discontinuities, shock waves, and…
The earliest drawings of datable auroras and a two-tail comet from the Syriac Chronicle of Zūqnīn
Hisashi Hayakawa, Yasuyuki Mitsuma, Yasunori Fujiwara +7
People have probably been watching the sky since the beginning of human history. Observers in pre-telescopic ages recorded anomalous events and these astronomical records in the hi…
Development of a 30 cm-cube Electron-Tracking Compton Camera for the SMILE-II Experiment
Y. Mizumura, T. Tanimori, H. Kubo +16
To explore the sub-MeV/MeV gamma-ray window for astronomy, we have developed the Electron-Tracking Compton Camera (ETCC), and carried out the first performance test at room conditi…
Non-thermal Electrons at the Earth's Bow Shock: A `Gradual' Event
M. Oka, T. Terasawa, M. Fujimoto +6
Earth's bow shock is known to produce non-thermal electrons which are generally observed as a `spike' in their flux profile. Here, in this paper, we present an analysis of electron…
Compression stress in opposite wood of angiosperms: observations in chestnut, mani and poplar
Bruno Clair, Tancrède Alméras, Junji Sugiyama
In order to face environmental constraints, trees are able to re-orient their axes by controlling the stress level in the newly formed wood layers. Angiosperms and gymnosperms evol…