Kazumasa Iwai

829 total citations · 1 hit paper
33 papers, 300 citations indexed

About

Kazumasa Iwai is a scholar working on Astronomy and Astrophysics, Molecular Biology and Signal Processing. According to data from OpenAlex, Kazumasa Iwai has authored 33 papers receiving a total of 300 indexed citations (citations by other indexed papers that have themselves been cited), including 30 papers in Astronomy and Astrophysics, 9 papers in Molecular Biology and 3 papers in Signal Processing. Recurrent topics in Kazumasa Iwai's work include Solar and Space Plasma Dynamics (28 papers), Ionosphere and magnetosphere dynamics (16 papers) and Geomagnetism and Paleomagnetism Studies (9 papers). Kazumasa Iwai is often cited by papers focused on Solar and Space Plasma Dynamics (28 papers), Ionosphere and magnetosphere dynamics (16 papers) and Geomagnetism and Paleomagnetism Studies (9 papers). Kazumasa Iwai collaborates with scholars based in Japan, United States and Germany. Kazumasa Iwai's co-authors include Fuminori Tsuchiya, Hiroaki Misawa, M. Shimojo, K. Fujiki, M. Tokumaru, K. Shibasaki, A. Morioka, S. M. White, Yoshizumi Miyoshi and S. Masuda and has published in prestigious journals such as The Astrophysical Journal, Astronomy and Astrophysics and Solar Physics.

In The Last Decade

Kazumasa Iwai

29 papers receiving 287 citations

Hit Papers

The Solar and Geomagnetic Storms in 2024 May: A Flash Dat... 2025 2026 2025 10 20 30 40
What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

  1. The Solar and Geomagnetic Storms in 2024 May: A Flash Data Report
    2025 47 citations Kazumasa Iwai, Daikou Shiota et al. The Astrophysical Journal profile →

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Kazumasa Iwai Japan 12 284 59 39 30 25 33 300
Edmund Henley United Kingdom 7 297 1.0× 93 1.6× 31 0.8× 30 1.0× 34 1.4× 11 319
Vratislav Krupař United States 14 435 1.5× 50 0.8× 11 0.3× 38 1.3× 29 1.2× 41 444
L. Rastäetter United States 11 322 1.1× 143 2.4× 33 0.8× 72 2.4× 31 1.2× 54 362
S. L. McGregor United States 10 409 1.4× 142 2.4× 30 0.8× 20 0.7× 46 1.8× 17 427
Karl‐Ludwig Klein France 14 499 1.8× 61 1.0× 17 0.4× 21 0.7× 55 2.2× 27 517
L. V. Yasnov Russia 12 311 1.1× 81 1.4× 14 0.4× 18 0.6× 19 0.8× 52 326
B. Nikutowski Germany 12 269 0.9× 102 1.7× 56 1.4× 28 0.9× 21 0.8× 30 299
R. B. Decker United States 12 479 1.7× 68 1.2× 25 0.6× 25 0.8× 41 1.6× 42 493
G. Pallocchia Italy 12 423 1.5× 218 3.7× 27 0.7× 71 2.4× 19 0.8× 22 452
S. N. Kuznetsov Russia 10 210 0.7× 75 1.3× 21 0.5× 72 2.4× 11 0.4× 51 254

Countries citing papers authored by Kazumasa Iwai

Since Specialization
Citations

This map shows the geographic impact of Kazumasa Iwai'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 Kazumasa Iwai with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Kazumasa Iwai more than expected).

Fields of papers citing papers by Kazumasa Iwai

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Kazumasa Iwai. 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 Kazumasa Iwai. The network helps show where Kazumasa Iwai may publish in the future.

Co-authorship network of co-authors of Kazumasa Iwai

This figure shows the co-authorship network connecting the top 25 collaborators of Kazumasa Iwai. A scholar is included among the top collaborators of Kazumasa Iwai 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 Kazumasa Iwai. Kazumasa Iwai 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.
White, S. M., Kazumasa Iwai, M. Shimojo, et al.. (2023). The Importance of Synoptic Solar Radio Observations.
2.
Jackson, B. V., M. Tokumaru, Kazumasa Iwai, et al.. (2023). Forecasting Heliospheric CME Solar-Wind Parameters Using the UCSD Time-Dependent Tomography and ISEE Interplanetary Scintillation Data: The 10 March 2022 CME. Solar Physics. 298(5). 74–74. 5 indexed citations
3.
Shoda, Munehito, Kazumasa Iwai, & Daikou Shiota. (2022). Testing the Alfv\'en-wave model of the solar wind with interplanetary scintillation. arXiv (Cornell University).
4.
Fallows, R. A., M. Tokumaru, M. M. Bisi, & Kazumasa Iwai. (2021). Tracing the Passage of CMEs in the Inner Heliosphere with LOFAR. 43. 1026. 1 indexed citations
5.
Bisi, M. M., Alessandra Abe Pacini, E. Aguilar‐Rodríguez, et al.. (2021). A Ground-Based Heliospheric Observatory for Space Weather: The Worldwide Interplanetary Scintillation (IPS) Stations (WIPSS) Network. 43. 2370. 2 indexed citations
6.
Tokumaru, M., K. Fujiki, Masayoshi Kojima, & Kazumasa Iwai. (2021). Global Distribution of the Solar Wind Speed Reconstructed from Improved Tomographic Analysis of Interplanetary Scintillation Observations between 1985 and 2019. The Astrophysical Journal. 922(1). 73–73. 25 indexed citations
7.
Tokumaru, M., K. Fujiki, Kazumasa Iwai, S. А. Tyul’bashev, & И. В. Чашей. (2019). Coordinated Interplanetary Scintillation Observations in Japan and Russia for Coronal Mass Ejection Events in Early September 2017. Solar Physics. 294(7). 11 indexed citations
8.
Misawa, Hiroaki, Kazumasa Iwai, S. Masuda, et al.. (2018). Detection of Propagating Fast Sausage Waves through Detailed Analysis of a Zebra-pattern Fine Structure in a Solar Radio Burst. The Astrophysical Journal Letters. 855(2). L29–L29. 13 indexed citations
9.
White, S. M., M. Shimojo, T. S. Bastian, et al.. (2017). Solar Commissioning Observations of the Sun with ALMA. 1 indexed citations
10.
Iwai, Kazumasa, M. Shimojo, Shin’ichiro Asayama, et al.. (2017). The Brightness Temperature of the Quiet Solar Chromosphere at 2.6 mm. Solar Physics. 292(1). 15 indexed citations
11.
Loukitcheva, M., Kazumasa Iwai, S. K. Solanki, S. M. White, & M. Shimojo. (2017). Solar ALMA Observations: Constraining the Chromosphere above Sunspots. The Astrophysical Journal. 850(1). 35–35. 20 indexed citations
12.
Nakahara, Hiroki, Hiroyuki Nakanishi, Kazumasa Iwai, & Tsutomu Sasao. (2017). An FFT Circuit for a Spectrometer of a Radio Telescope using the Nested RNS including the Constant Division. ACM SIGARCH Computer Architecture News. 44(4). 44–49. 4 indexed citations
13.
Iwai, Kazumasa, et al.. (2016). CHROMOSPHERIC SUNSPOTS IN THE MILLIMETER RANGE AS OBSERVED BY THE NOBEYAMA RADIOHELIOGRAPH. The Astrophysical Journal. 816(2). 91–91. 12 indexed citations
14.
Warmuth, A., K. Shibasaki, Kazumasa Iwai, & G. Mann. (2016). Microwave observations of a large-scale coronal wave with the Nobeyama radioheliograph. Astronomy and Astrophysics. 593. A102–A102. 3 indexed citations
15.
Morioka, A., Yoshizumi Miyoshi, Kazumasa Iwai, et al.. (2015). SOLAR MICRO-TYPE III BURST STORMS AND LONG DIPOLAR MAGNETIC FIELD IN THE OUTER CORONA. The Astrophysical Journal. 808(2). 191–191. 4 indexed citations
16.
Nakahara, Hiroki, Tsutomu Sasao, Hiroyuki Nakanishi, & Kazumasa Iwai. (2015). An RNS FFT Circuit Using LUT Cascades Based on a Modulo EVMDD. 4. 97–102. 2 indexed citations
17.
Nakahara, Hiroki, Hiroyuki Nakanishi, & Kazumasa Iwai. (2014). An AWF digital spectrometer for a radio telescope. 7. 1–6.
18.
Katoh, Yuto, Kazumasa Iwai, Atsushi Kumamoto, et al.. (2014). GENERATION MECHANISM OF THE SLOWLY DRIFTING NARROWBAND STRUCTURE IN THE TYPE IV SOLAR RADIO BURSTS OBSERVED BY AMATERAS. The Astrophysical Journal. 787(1). 45–45. 5 indexed citations
19.
Iwai, Kazumasa, Yoshizumi Miyoshi, S. Masuda, et al.. (2014). SPECTRAL STRUCTURES AND THEIR GENERATION MECHANISMS FOR SOLAR RADIO TYPE-I BURSTS. The Astrophysical Journal. 789(1). 4–4. 8 indexed citations
20.
Iwai, Kazumasa, S. Masuda, Yoshizumi Miyoshi, et al.. (2013). PEAK FLUX DISTRIBUTIONS OF SOLAR RADIO TYPE-I BURSTS FROM HIGHLY RESOLVED SPECTRAL OBSERVATIONS. The Astrophysical Journal Letters. 768(1). L2–L2. 11 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.

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