187 citations · 333 across the 13 of their papers we have counts for
14 papers
Using Consumer Cameras to Observe Scintillation Light from Radiation
Yuzuka Sasaki, Yuuki Wada, Kazuo S. Tanaka
For a long time, the cloud chamber was the only educational tool available for measuring radiation. In recent years, simple radiation detectors combining scintillators with silicon…
Evolution of the inner accretion flow and the white-dwarf spin pulse during the 2023 outburst in GK Persei
Mariko Kimura, Takayuki Hayashi, Yuuki Wada +8
We present our X-ray and optical observations performed by NICER, NuSTAR, and Tomo-e Gozen during the 2023 outburst in the intermediate polar GK Persei. The X-ray spectrum consiste…
X-Raying Neutral Density Disturbances in the Mesosphere and Lower Thermosphere induced by the 2022 Hunga-Tonga Volcano Eruption-Explosion
Satoru Katsuda, Hiroyuki Shinagawa, Hitoshi Fujiwara +14
We present X-ray observations of the upper atmospheric density disturbance caused by the explosive eruption of the Hunga Tonga-Hunga Ha'apai (HTHH) volcano on 15 January 2022. From…
On-ground calibration of the X-ray, gamma-ray, and relativistic electron detector onboard TARANIS
Yuuki Wada, Philippe Laurent, Damien Pailot +9
We developed the X-ray, Gamma-ray and Relativistic Electron detector (XGRE) onboard the TARANIS satellite, to investigate high-energy phenomena associated with lightning discharges…
Catalog of Gamma-ray Glows during Four Winter Seasons in Japan
Yuuki Wada, Takahiro Matsumoto, Teruaki Enoto +12
In 2015 the Gamma-Ray Observation of Winter Thunderstorms (GROWTH) collaboration launched a mapping observation campaign for high-energy atmospheric phenomena related to thundersto…
Generation possibility of gamma-ray glows induced by photonuclear reactions
Gabriel Sousa Diniz, Ivan Soares Ferreira, Yuuki Wada +1
Relativistic runaway electron avalanches (RREAs) imply a large multiplication of high energy electrons (~1 MeV). Two factors are necessary for this phenomenon: a high electric fiel…
Thundercloud Project: Exploring high-energy phenomena in thundercloud and lightning
Takayuki Yuasa, Yuuki Wada, Teruaki Enoto +10
We designed, developed, and deployed a distributed sensor network aiming at observing high-energy ionizing radiation, primarily gamma rays, from winter thunderclouds and lightning…
Photoneutron Detection in Lightning by Gadolinium Orthosilicate Scintillators
Yuuki Wada, Kazuhiro Nakazawa, Teruaki Enoto +4
During a winter thunderstorm on November 24, 2017, a downward terrestrial gamma-ray flash took place and triggered photonuclear reactions with atmospheric nitrogen and oxygen nucle…
Downward Terrestrial Gamma-ray Flash observed in Winter Thunderstorm
Yuuki Wada, Teruaki Enoto, Kazuhiro Nakazawa +7
During a winter thunderstorm on 2017 November 24, a strong burst of gamma rays with energies up to 10~MeV was detected coincident with a lightning discharge, by scintillation…
Mapping Observation Project of High-Energy Phenomena during Winter Thunderstorms in Japan
Yuuki Wada, Teruaki Enoto, Yoshihiro Furuta +7
The Gamma-Ray Observation of Winter Thunderclouds (GROWTH) collaboration has been performing observation campaigns of high-energy radiation in coastal areas of Japan Sea. Winter th…
Termination of Electron Acceleration in Thundercloud by Intra/Inter-cloud Discharge
Yuuki Wada, Gregory S. Bowers, Teruaki Enoto +12
An on-ground observation program for high energy atmospheric phenomena in winter thunderstorms along Japan Sea has been performed via measurements of gamma-ray radiation, atmospher…
Photonuclear Reactions in Lightning Discovered from Detection of Positrons and Neutrons
Teruaki Enoto, Yuuki Wada, Yoshihiro Furuta +9
Lightning and thundercloud are the most dramatic natural particle accelerators on the Earth. Relativistic electrons accelerated by electric fields therein emit bremsstrahlung gamma…
An Estimation of the White Dwarf Mass in the Dwarf Nova GK Persei with NuSTAR Observations of Two States
Yuuki Wada, Takayuki Yuasa, Kazuhiro Nakazawa +3
We report on X-ray observations of the Dwarf Nova GK Persei performed by {\it NuSTAR} in 2015. GK Persei, behaving also as an Intermediate Polar, exhibited a Dwarf Nova outburst in…
NuSTAR observations of the Dwarf Nova GK Persei in 2015: comparison between outburst and quiescent phases
Yuuki Wada, Takayuki Yuasa, Kazuhiro Nakazawa +3
We report on NuSTAR observations of the Intermediate Polar GK Persei which also behaves as a Dwarf Nova. It exhibited a Dwarf Nova outburst in 2015 March-April. The object was obse…