Kouichi Hirotani

1.8k total citations
47 papers, 741 citations indexed

About

Kouichi Hirotani is a scholar working on Astronomy and Astrophysics, Nuclear and High Energy Physics and Geophysics. According to data from OpenAlex, Kouichi Hirotani has authored 47 papers receiving a total of 741 indexed citations (citations by other indexed papers that have themselves been cited), including 46 papers in Astronomy and Astrophysics, 40 papers in Nuclear and High Energy Physics and 7 papers in Geophysics. Recurrent topics in Kouichi Hirotani's work include Astrophysics and Cosmic Phenomena (38 papers), Pulsars and Gravitational Waves Research (36 papers) and Astrophysical Phenomena and Observations (15 papers). Kouichi Hirotani is often cited by papers focused on Astrophysics and Cosmic Phenomena (38 papers), Pulsars and Gravitational Waves Research (36 papers) and Astrophysical Phenomena and Observations (15 papers). Kouichi Hirotani collaborates with scholars based in Taiwan, Japan and Germany. Kouichi Hirotani's co-authors include Shinpei Shibata, Isao Okamoto, Hung-Yi Pu, J. Takata, A. K. Harding, Daniele Viganò, Martín E. Pessah, D. F. Torres, Hsiang‐Kuang Chang and S. Nitta and has published in prestigious journals such as The Astrophysical Journal, Monthly Notices of the Royal Astronomical Society and The Astrophysical Journal Letters.

In The Last Decade

Kouichi Hirotani

44 papers receiving 717 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Kouichi Hirotani Taiwan 16 695 564 96 65 46 47 741
G. Z. Machabeli Georgia 13 545 0.8× 336 0.6× 123 1.3× 143 2.2× 60 1.3× 64 607
A. N. Timokhin Russia 10 709 1.0× 379 0.7× 195 2.0× 74 1.1× 101 2.2× 22 766
B. Rudak Poland 15 682 1.0× 416 0.7× 89 0.9× 33 0.5× 51 1.1× 45 725
R. P. Fender United Kingdom 18 1.1k 1.5× 449 0.8× 126 1.3× 35 0.5× 10 0.2× 51 1.1k
D. Sanwal United States 14 637 0.9× 307 0.5× 96 1.0× 29 0.4× 32 0.7× 25 652
Kazumi Kashiyama Japan 19 1.0k 1.5× 427 0.8× 51 0.5× 59 0.9× 7 0.2× 51 1.1k
Ben Margalit United States 21 1.5k 2.2× 422 0.7× 126 1.3× 38 0.6× 10 0.2× 36 1.6k
Zhi‐Fu Gao China 10 327 0.5× 125 0.2× 120 1.3× 43 0.7× 36 0.8× 32 382
Roberto Taverna Italy 12 327 0.5× 123 0.2× 117 1.2× 79 1.2× 34 0.7× 31 411
A. G. Muslimov United States 13 932 1.3× 444 0.8× 228 2.4× 95 1.5× 118 2.6× 28 942

Countries citing papers authored by Kouichi Hirotani

Since Specialization
Citations

This map shows the geographic impact of Kouichi Hirotani's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Kouichi Hirotani with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Kouichi Hirotani more than expected).

Fields of papers citing papers by Kouichi Hirotani

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Kouichi Hirotani. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Kouichi Hirotani. The network helps show where Kouichi Hirotani may publish in the future.

Co-authorship network of co-authors of Kouichi Hirotani

This figure shows the co-authorship network connecting the top 25 collaborators of Kouichi Hirotani. A scholar is included among the top collaborators of Kouichi Hirotani based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Kouichi Hirotani. Kouichi Hirotani is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Hirotani, Kouichi, Hsien Shang, Ruben Krasnopolsky, & Ken‐Ichi Nishikawa. (2023). Two-dimensional Particle-in-cell Simulations of Axisymmetric Black Hole Magnetospheres: Angular Dependence of the Blandford–Znajek Flux. The Astrophysical Journal. 943(2). 164–164. 5 indexed citations
2.
Nishikawa, Ken‐Ichi, A. Meli, Christoph Köhn, et al.. (2021). 3D PIC Simulations for Relativistic Jets with a Toroidal Magnetic Field. Proceedings of the International Astronomical Union. 17(S375). 44–48. 2 indexed citations
3.
Hirotani, Kouichi, et al.. (2018). High-energy and Very High Energy Emission from Stellar-mass Black Holes Moving in Gaseous Clouds. The Astrophysical Journal. 867(2). 120–120. 4 indexed citations
4.
Hirotani, Kouichi. (2018). Very High-Energy Emission from the Direct Vicinity of Rapidly Rotating Black Holes. Galaxies. 6(4). 122–122. 6 indexed citations
5.
Hirotani, Kouichi, Hung-Yi Pu, & Satoki Matsushita. (2018). Lightning black holes as unidentified TeV sources. Journal of Astrophysics and Astronomy. 39(4). 2 indexed citations
6.
Pu, Hung-Yi, et al.. (2017). Enhanced gamma radiation towards the rotation axis from the immediate vicinity of extremely rotating black holes. Monthly Notices of the Royal Astronomical Society Letters. 471(1). L135–L139. 5 indexed citations
7.
Viganò, Daniele, D. F. Torres, Kouichi Hirotani, & Martín E. Pessah. (2015). An assessment of the pulsar outer gap model – I. Assumptions, uncertainties, and implications on the gap size and the accelerating field. Monthly Notices of the Royal Astronomical Society. 447(3). 2631–2648. 13 indexed citations
8.
Viganò, Daniele, D. F. Torres, Kouichi Hirotani, & Martín E. Pessah. (2014). Compact formulae, dynamics and radiation of charged particles under synchro-curvature losses. Monthly Notices of the Royal Astronomical Society. 447(2). 1164–1172. 22 indexed citations
9.
Hirotani, Kouichi. (2013). LUMINOSITY EVOLUTION OF GAMMA-RAY PULSARS. The Astrophysical Journal. 766(2). 98–98. 12 indexed citations
10.
Hirotani, Kouichi. (2008). Outer-Gap versus Slot-Gap Models for Pulsar High-Energy Emissions: The Case of the Crab Pulsar. The Astrophysical Journal. 688(1). L25–L28. 36 indexed citations
11.
Takata, J., et al.. (2006). A two-dimensional electrodynamical outer gap model for  -ray pulsars:  -ray spectrum. Monthly Notices of the Royal Astronomical Society. 366(4). 1310–1328. 42 indexed citations
12.
Hirotani, Kouichi. (2005). High energy emission from pulsars: Outer gap scenario. Advances in Space Research. 35(6). 1085–1091. 4 indexed citations
13.
Takata, J., et al.. (2004). Outer-magnetospheric model for Vela-like pulsars: formation of sub-GeV spectrum. Monthly Notices of the Royal Astronomical Society. 348(1). 241–249. 13 indexed citations
14.
Hirakawa, Kazuhiko, et al.. (2002). High-sensitivity modulation-doped quantum dot infrared photodetectors. Microelectronic Engineering. 63(1-3). 185–192. 13 indexed citations
15.
Hirotani, Kouichi & Shinpei Shibata. (2001). Electrodynamic Structure of an Outer Gap Accelerator: Location of the Gap and the Gamma‐Ray Emission from the Crab Pulsar. The Astrophysical Journal. 558(1). 216–227. 20 indexed citations
16.
Hirotani, Kouichi & Shinpei Shibata. (2000). Electrodynamic Structure of an Outer-Gap Accelerator: Gamma-Ray Emission from the Crab Pulsar. CERN Bulletin. 30. 193–199. 1 indexed citations
17.
Hirotani, Kouichi. (2000). Gamma-ray emission from pulsars: strength of the acceleration field in the outer gap. Monthly Notices of the Royal Astronomical Society. 317(2). 225–233. 6 indexed citations
18.
Hirotani, Kouichi & Shinpei Shibata. (1999). One-dimensional electric field structure of an outer gap accelerator — II. γ-ray production resulting from inverse Compton scattering. Monthly Notices of the Royal Astronomical Society. 308(1). 67–76. 19 indexed citations
19.
Hirotani, Kouichi & Isao Okamoto. (1998). Pair Plasma Production in a Force‐free Magnetosphere around a Supermassive Black Hole. The Astrophysical Journal. 497(2). 563–572. 72 indexed citations
20.
Hirotani, Kouichi, Masaaki Takahashi, S. Nitta, & Akira Tomimatsu. (1992). Accretion in a Kerr black hole magnetosphere - Energy and angular momentum transport between the magnetic field and the matter. The Astrophysical Journal. 386. 455–455. 38 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

Explore authors with similar magnitude of impact

Breakdown of academic impact, for papers by G. Z. Machabeli Breakdown of academic impact, for papers by A. N. Timokhin Breakdown of academic impact, for papers by B. Rudak Breakdown of academic impact, for papers by R. P. Fender Breakdown of academic impact, for papers by D. Sanwal Breakdown of academic impact, for papers by Kazumi Kashiyama Breakdown of academic impact, for papers by Ben Margalit Breakdown of academic impact, for papers by Zhi‐Fu Gao Breakdown of academic impact, for papers by Roberto Taverna Breakdown of academic impact, for papers by A. G. Muslimov
Rankless by CCL
2026