Publications of Kazumasa Iwai

A list of publications authored or co-authored by Kazumasa Iwai, derived from the SAO/NASA Astrophysics Data System (ADS). The number in brackets after each title indicates the number of citations that the paper has received.

Orcid ID: 0000-0002-2464-5212

List of publications ordered by citations
Number of papers: 43 (refereed: 43)
No. of citations: 813
First author papers: 14 (refereed: 14)

2025

  1. The Solar and Geomagnetic Storms in 2024 May: A Flash Data Report [108]
    Hayakawa, Hisashi, Ebihara, Yusuke, Mishev, Alexander, Koldobskiy, Sergey, Kusano, Kanya, Bechet, Sabrina, Yashiro, Seiji, Iwai, Kazumasa, Shinbori, Atsuki, Mursula, Kalevi, Miyake, Fusa, Shiota, Daikou, Silveira, Marcos V. D., Stuart, Robert, Oliveira, Denny M., Akiyama, Sachiko, Ohnishi, Kouji, Ledvina, Vincent & Miyoshi, Yoshizumi, ApJ, 979, 49
  2. Ground-based Observations of Temporal Variation of the Cosmic-Ray Spectrum during Forbush Decreases [1]
    Mitthumsiri, W., Ruffolo, D., Munakata, K., Kozai, M., Hayashi, Y., Kato, C., Muangha, P., Sáiz, A., Evenson, P., Mangeard, P.-S., Clem, J., Seunarine, S., Nuntiyakul, W., Miyashita, N., Kataoka, R., Kadokura, A., Miyake, S., Iwai, K., Menjo, H., Echer, E., Dal Lago, A., Rockenbach, M., Schuch, N. J., Bageston, J. V., Braga, C. R., Al Jassar, H. K., Sharma, M. M., Burahmah, N., Zaman, F., Duldig, M. L., Sabbah, I. & Kuwabara, T., ApJ, 986, L7
  3. Solar and Interplanetary Determinants of Long-term Solar Modulation of Cosmic-Ray Intensity for Median Rigidities of 11─107 GV [1]
    Poopakun, K., Nuntiyakul, W., Kato, C., Munakata, K., Kozai, M., Hayashi, Y., Ruffolo, D., Iwai, K., Menjo, H., Zhai, L. M. & Duldig, M. L., ApJ, 991, 127
  4. BepiColombo cruise science: overview of the mission contribution to heliophysics [2]
    Sánchez-Cano, Beatriz, Hadid, Lina Z., Aizawa, Sae, Murakami, Go, Bamba, Yumi, Chiba, Shota, Hara, Takuya, Heyner, Daniel, Ho, George, Iwai, Kazumasa, Kilpua, Emilia, Kinoshita, Gaku, Lavraud, Benoit, Miyoshi, Yoshizumi, Pinto, Marco, Schmid, Daniel, Shiota, Daikou, Vainio, Rami, Andre, Nicolas, Aronica, Alessandro, Asmar, Sami, Auster, Hans-Ulrich, Barabash, Stas, Barthe, Alain, Baumjohann, Wolfgang, Benkhoff, Johannes, Bentley, Mark, Bunce, Emma, Cappuccio, Paolo, Delcourt, Dominique, di Stefano, Ivan, Doria, Irene, Dresing, Nina, Fedorov, Andrei, Fischer, David, Fiethe, Bjorn, Fränz, Markus, Gieseler, Jan, Giner, Franz, Giono, Gabriel, Harada, Yuki, Hussmann, Hauke, Iess, Luciano, Imamura, Takeshi, Jeszenszky, Harald, Jones, Geraint, Katra, Bruno, Kazakov, Adrian, Kozyrev, Alexander, Laky, Gunter, Lefevre, Carlo, Lichtenegger, Herbert, Lindsay, Simon, Lucente, Marco, Magnafico, Carmelo, Magnes, Werner, Martindale, Adrian, Matsuoka, Ayako, Milillo, Anna, Mitrofanov, Igor, Nishiyama, Gaku, Oleynik, Philipp, Orsini, Stefano, Paik, Meegyeong, Palmroos, Christian, Plainaki, Christina, Penou, Emanuel, Persson, Moa, Quarati, Francesco, Quémerais, Eric, Richter, Ingo, Robidel, Rozenn, Rojo, Mathias, Saito, Yoshifumi, Santoli, Francesco, Stark, Alexander, Stumpo, Mirko, Tian, Rong, Varsani, Ali, Verdeil, Christopher, Williamson, Hayley, Witasse, Olivier & Yokota, Shoichiro, Earth, Planets and Space, 77, 114

2024

  1. Cosmic-Ray North─South Anisotropy: Rigidity Spectrum and Solar Cycle Variations Observed by Ground-based Muon Detectors [0]
    Kozai, M., Hayashi, Y., Fujii, K., Munakata, K., Kato, C., Miyashita, N., Kadokura, A., Kataoka, R., Miyake, S., Duldig, M. L., Humble, J. E. & Iwai, K., ApJ, 977, 160
  2. Global Analysis of the Extended Decreases in Cosmic Rays Observed with Worldwide Networks of Neutron Monitors and Muon Detectors: Temporal Variation of the Rigidity Spectrum and Its Implication [3]
    Munakata, K., Hayashi, Y., Kozai, M., Kato, C., Miyashita, N., Kataoka, R., Kadokura, A., Miyake, S., Iwai, K., Echer, E., Dal Lago, A., Rockenbach, M., Schuch, N. J., Bageston, J. V., Braga, C. R., Al Jassar, H. K., Sharma, M. M., Duldig, M. L., Humble, J. E., Sabbah, I., Evenson, P., Kuwabara, T. & Kóta, J., ApJ, 974, 283
  3. Comparison of Solar Multifrequency Microwave Data with Other Solar Indices for Understanding Solar and Stellar Microwave Data [0]
    Shimojo, Masumi, Namekata, Kosuke, Iwai, Kazumasa, Asai, Ayumi & Watanabe, Kyoko, ApJ, 965, 170
  4. Electron Cyclotron Maser Emission and the Brightest Solar Radio Bursts [5]
    White, Stephen M., Shimojo, Masumi, Iwai, Kazumasa, Bastian, Timothy S., Fleishman, Gregory D., Gary, Dale E., Magdalenic, Jasmina & Vourlidas, Angelos, ApJ, 969, 3

2023

  1. Automatic Detection of Type II Solar Radio Burst by Using 1-D Convolution Neutral Network [0]
    Cho, Kyung-Suk, Kim, Junyoung, Kim, Rok-Soon, Park, Eunsu, Kubo, Yûki & Iwai, Kazumasa, Journal of Korean Astronomical Society, 56, 213
  2. Over seven decades of solar microwave data obtained with Toyokawa and Nobeyama Radio Polarimeters [14]
    Shimojo, Masumi & Iwai, Kazumasa, Geoscience Data Journal, 10, 114

2022

  1. Testing the Alfvén-wave Model of the Solar Wind with Interplanetary Scintillation [4]
    Shoda, Munehito, Iwai, Kazumasa & Shiota, Daikou, ApJ, 928, 130

2021

  1. Validation of coronal mass ejection arrival-time forecasts by magnetohydrodynamic simulations based on interplanetary scintillation observations [26]
    Iwai, Kazumasa, Shiota, Daikou, Tokumaru, Munetoshi, Fujiki, Ken'ichi, Den, Mitsue & Kubo, Yûki, Earth, Planets and Space, 73, 9
  2. Global Distribution of the Solar Wind Speed Reconstructed from Improved Tomographic Analysis of Interplanetary Scintillation Observations between 1985 and 2019 [32]
    Tokumaru, Munetoshi, Fujiki, Ken'ichi, Kojima, Masayoshi & Iwai, Kazumasa, ApJ, 922, 73
  3. Venus's induced magnetosphere during active solar wind conditions at BepiColombo's Venus 1 flyby [5]
    Volwerk, Martin, Sánchez-Cano, Beatriz, Heyner, Daniel, Aizawa, Sae, André, Nicolas, Varsani, Ali, Mieth, Johannes, Orsini, Stefano, Baumjohann, Wolfgang, Fischer, David, Futaana, Yoshifumi, Harrison, Richard, Jeszenszky, Harald, Kazumasa, Iwai, Laky, Gunter, Lichtenegger, Herbert, Milillo, Anna, Miyoshi, Yoshizumi, Nakamura, Rumi, Plaschke, Ferdinand, Richter, Ingo, Rojas Mata, Sebastián, Saito, Yoshifumi, Schmid, Daniel, Shiota, Daikou & Wedlund, Cyril Simon, Annales Geophysicae, 39, 811

2020

  1. Spectral Structures of Type II Solar Radio Bursts and Solar Energetic Particles [9]
    Iwai, Kazumasa, Yashiro, Seiji, Nitta, Nariaki V. & Kubo, Yûki, ApJ, 888, 50
  2. Estimating the Temperature and Density of a Spicule from 100 GHz Data Obtained with ALMA [18]
    Shimojo, Masumi, Kawate, Tomoko, Okamoto, Takenori J., Yokoyama, Takaaki, Narukage, Noriyuki, Sakao, Taro, Iwai, Kazumasa, Fleishman, Gregory D. & Shibata, Kazunari, ApJ, 888, L28

2019

  1. Comparative Study of Microwave Polar Brightening, Coronal Holes, and Solar Wind over the Solar Poles [3]
    Fujiki, Ken'ichi, Shibasaki, Kiyoto, Yashiro, Seiji, Tokumaru, Munetoshi, Iwai, Kazumasa & Masuda, Satoshi, Solar Physics, 294, 30
  2. Development of a coronal mass ejection arrival time forecasting system using interplanetary scintillation observations [24]
    Iwai, Kazumasa, Shiota, Daikou, Tokumaru, Munetoshi, Fujiki, Ken'ichi, Den, Mitsue & Kubo, Yûki, Earth, Planets and Space, 71, 39
  3. Solar Polar Brightening and Radius at 100 and 230 GHz Observed by ALMA [26]
    Selhorst, Caius L., Simões, Paulo J. A., Brajša, Roman, Valio, Adriana, Giménez de Castro, C. G., Costa, Joaquim E. R., Menezes, Fabian, Rozelot, Jean Pierre, Hales, Antonio S., Iwai, Kazumasa & White, Stephen, ApJ, 871, 45
  4. Coordinated Interplanetary Scintillation Observations in Japan and Russia for Coronal Mass Ejection Events in Early September 2017 [8]
    Tokumaru, Munetoshi, Fujiki, Ken'ichi, Iwai, Kazumasa, Tyul'bashev, Sergey & Chashei, Igor, Solar Physics, 294, 87

2018

  1. Detection of Propagating Fast Sausage Waves through Detailed Analysis of a Zebra-pattern Fine Structure in a Solar Radio Burst [21]
    Kaneda, K., Misawa, H., Iwai, K., Masuda, S., Tsuchiya, F., Katoh, Y. & Obara, T., ApJ, 855, L29

2017

  1. ALMA Discovery of Solar Umbral Brightness Enhancement at λ = 3 mm [18]
    Iwai, Kazumasa, Loukitcheva, Maria, Shimojo, Masumi, Solanki, Sami K. & White, Stephen M., ApJ, 841, L20
  2. The Brightness Temperature of the Quiet Solar Chromosphere at 2.6 mm [19]
    Iwai, Kazumasa, Shimojo, Masumi, Asayama, Shinichiro, Minamidani, Tetsuhiro, White, Stephen, Bastian, Timothy & Saito, Masao, Solar Physics, 292, 22
  3. OCTAD-S: digital fast Fourier transform spectrometers by FPGA [20]
    Iwai, Kazumasa, Kubo, Yûki, Ishibashi, Hiromitsu, Naoi, Takahiro, Harada, Kenichi, Ema, Kenji, Hayashi, Yoshinori & Chikahiro, Yuichi, Earth, Planets and Space, 69, 95
  4. Polarization Characteristics of Zebra Patterns in Type IV Solar Radio Bursts [8]
    Kaneda, K., Misawa, H., Iwai, K., Tsuchiya, F., Obara, T., Katoh, Y. & Masuda, S., ApJ, 842, 45
  5. Solar ALMA Observations: Constraining the Chromosphere above Sunspots [26]
    Loukitcheva, Maria A., Iwai, Kazumasa, Solanki, Sami K., White, Stephen M. & Shimojo, Masumi, ApJ, 850, 35
  6. Observing the Sun with the Atacama Large Millimeter/submillimeter Array (ALMA): High-Resolution Interferometric Imaging [72]
    Shimojo, M., Bastian, T. S., Hales, A. S., White, S. M., Iwai, K., Hills, R. E., Hirota, A., Phillips, N. M., Sawada, T., Yagoubov, P., Siringo, G., Asayama, S., Sugimoto, M., Brajša, R., Skokić, I., Bárta, M., Kim, S., de Gregorio-Monsalvo, I., Corder, S. A., Hudson, H. S., Wedemeyer, S., Gary, D. E., De Pontieu, B., Loukitcheva, M., Fleishman, G. D., Chen, B., Kobelski, A. & Yan, Y., Solar Physics, 292, 87
  7. The First ALMA Observation of a Solar Plasmoid Ejection from an X-Ray Bright Point [32]
    Shimojo, Masumi, Hudson, Hugh S., White, Stephen M., Bastian, Timothy S. & Iwai, Kazumasa, ApJ, 841, L5
  8. Variation of the Solar Microwave Spectrum in the Last Half Century [15]
    Shimojo, Masumi, Iwai, Kazumasa, Asai, Ayumi, Nozawa, Satoshi, Minamidani, Tetsuhiro & Saito, Masao, ApJ, 848, 62
  9. Observing the Sun with the Atacama Large Millimeter/submillimeter Array (ALMA): Fast-Scan Single-Dish Mapping [97]
    White, S. M., Iwai, K., Phillips, N. M., Hills, R. E., Hirota, A., Yagoubov, P., Siringo, G., Shimojo, M., Bastian, T. S., Hales, A. S., Sawada, T., Asayama, S., Sugimoto, M., Marson, R. G., Kawasaki, W., Muller, E., Nakazato, T., Sugimoto, K., Brajša, R., Skokić, I., Bárta, M., Kim, S., Remijan, A. J., de Gregorio, I., Corder, S. A., Hudson, H. S., Loukitcheva, M., Chen, B., De Pontieu, B., Fleishmann, G. D., Gary, D. E., Kobelski, A., Wedemeyer, S. & Yan, Y., Solar Physics, 292, 88

2016

  1. Chromospheric Sunspots in the Millimeter Range as Observed by the Nobeyama Radioheliograph [17]
    Iwai, Kazumasa, Koshiishi, Hideki, Shibasaki, Kiyoto, Nozawa, Satoshi, Miyawaki, Shun & Yoneya, Takuro, ApJ, 816, 91
  2. Coronal Magnetic Fields Derived from Simultaneous Microwave and EUV Observations and Comparison with the Potential Field Model [14]
    Miyawaki, Shun, iwai, Kazumasa, Shibasaki, Kiyoto, Shiota, Daikou & Nozawa, Satoshi, ApJ, 818, 8
  3. Microwave observations of a large-scale coronal wave with the Nobeyama radioheliograph [4]
    Warmuth, A., Shibasaki, K., Iwai, K. & Mann, G., A&A, 593, A102

2015

  1. Observation of the Chromospheric Sunspot at Millimeter Range with the Nobeyama 45 m Telescope [19]
    Iwai, Kazumasa & Shimojo, Masumi, ApJ, 804, 48
  2. Frequency Dependence of Polarization of Zebra Pattern in Type-IV Solar Radio Bursts [12]
    Kaneda, Kazutaka, Misawa, H., Iwai, K., Tsuchiya, F. & Obara, T., ApJ, 808, L45
  3. Solar Micro-Type III Burst Storms and Long Dipolar Magnetic Field in the Outer Corona [5]
    Morioka, A., Miyoshi, Y., Iwai, K., Kasaba, Y., Masuda, S., Misawa, H. & Obara, T., ApJ, 808, 191

2014

  1. Spectral Structures and Their Generation Mechanisms for Solar Radio Type-I Bursts [16]
    Iwai, K., Miyoshi, Y., Masuda, S., Tsuchiya, F., Morioka, A. & Misawa, H., ApJ, 789, 4
  2. Coronal magnetic field and the plasma beta determined from radio and multiple satellite observations [22]
    Iwai, Kazumasa, Shibasaki, Kiyoto, Nozawa, Satoshi, Takahashi, Takuya, Sawada, Shinpei, Kitagawa, Jun, Miyawaki, Shun & Kashiwagi, Hirotaka, Earth, Planets and Space, 66, 149
  3. Generation Mechanism of the Slowly Drifting Narrowband Structure in the Type IV Solar Radio Bursts Observed by Amateras [7]
    Katoh, Y., Iwai, K., Nishimura, Y., Kumamoto, A., Misawa, H., Tsuchiya, F. & Ono, T., ApJ, 787, 45

2013

  1. Peak Flux Distributions of Solar Radio Type-i Bursts from Highly Resolved Spectral Observations [18]
    Iwai, K., Masuda, S., Miyoshi, Y., Tsuchiya, F., Morioka, A. & Misawa, H., ApJ, 768, L2
  2. Measurements of Coronal and Chromospheric Magnetic Fields using Polarization Observations by the Nobeyama Radioheliograph [14]
    Iwai, Kazumasa & Shibasaki, Kiyoto, Publications of the Astronomical Society of Japan, 65, S14

2012

  1. IPRT/AMATERAS: A New Metric Spectrum Observation System for Solar Radio Bursts [27]
    Iwai, K., Tsuchiya, F., Morioka, A. & Misawa, H., Solar Physics, 277, 447
  2. Solar Radio Type-I Noise Storm Modulated by Coronal Mass Ejections [21]
    Iwai, K., Miyoshi, Y., Masuda, S., Shimojo, M., Shiota, D., Inoue, S., Tsuchiya, F., Morioka, A. & Misawa, H., ApJ, 744, 167

Created on Wed Apr 8 04:30:15 2026.