Publications of Kazumasa Iwai ordered by citations

A list of publications authored or co-authored by Kazumasa Iwai, derived from the SAO/NASA Astrophysics Data System (ADS) and ordered by the numbers of citations.

Orcid ID: 0000-0002-2464-5212

124	The Solar and Geomagnetic Storms in 2024 May: A Flash Data Report 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, 2025, ApJ, 979, 49
98	Observing the Sun with the Atacama Large Millimeter/submillimeter Array (ALMA): Fast-Scan Single-Dish Mapping 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., 2017, Solar Physics, 292, 88
73	Observing the Sun with the Atacama Large Millimeter/submillimeter Array (ALMA): High-Resolution Interferometric Imaging 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., 2017, Solar Physics, 292, 87
34	BepiColombo Science Investigations During Cruise and Flybys at the Earth, Venus and Mercury Mangano, Valeria, Dósa, Melinda, Fränz, Markus, Milillo, Anna, Oliveira, Joana S., Lee, Yeon Joo, McKenna-Lawlor, Susan, Grassi, Davide, Heyner, Daniel, Kozyrev, Alexander S., Peron, Roberto, Helbert, Jörn, Besse, Sebastien, de la Fuente, Sara, Montagnon, Elsa, Zender, Joe, Volwerk, Martin, Chaufray, Jean-Yves, Slavin, James A., Krüger, Harald, Maturilli, Alessandro, Cornet, Thomas, Iwai, Kazumasa, Miyoshi, Yoshizumi, Lucente, Marco, Massetti, Stefano, Schmidt, Carl A., Dong, Chuanfei, Quarati, Francesco, Hirai, Takayuki, Varsani, Ali, Belyaev, Denis, Zhong, Jun, Kilpua, Emilia K. J., Jackson, Bernard V., Odstrcil, Dusan, Plaschke, Ferdinand, Vainio, Rami, Jarvinen, Riku, Ivanovski, Stavro Lambrov, Madár, Ákos, Erdős, Géza, Plainaki, Christina, Alberti, Tommaso, Aizawa, Sae, Benkhoff, Johannes, Murakami, Go, Quemerais, Eric, Hiesinger, Harald, Mitrofanov, Igor G., Iess, Luciano, Santoli, Francesco, Orsini, Stefano, Lichtenegger, Herbert, Laky, Gunther, Barabash, Stas, Moissl, Richard, Huovelin, Juhani, Kasaba, Yasumasa, Saito, Yoshifumi, Kobayashi, Masanori & Baumjohann, Wolfgang, 2021, Space Science Reviews, 217, 23
33	Global Distribution of the Solar Wind Speed Reconstructed from Improved Tomographic Analysis of Interplanetary Scintillation Observations between 1985 and 2019 Tokumaru, Munetoshi, Fujiki, Ken'ichi, Kojima, Masayoshi & Iwai, Kazumasa, 2021, ApJ, 922, 73
32	The First ALMA Observation of a Solar Plasmoid Ejection from an X-Ray Bright Point Shimojo, Masumi, Hudson, Hugh S., White, Stephen M., Bastian, Timothy S. & Iwai, Kazumasa, 2017, ApJ, 841, L5
27	IPRT/AMATERAS: A New Metric Spectrum Observation System for Solar Radio Bursts Iwai, K., Tsuchiya, F., Morioka, A. & Misawa, H., 2012, Solar Physics, 277, 447
27	Solar Polar Brightening and Radius at 100 and 230 GHz Observed by ALMA 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, 2019, ApJ, 871, 45
26	Validation of coronal mass ejection arrival-time forecasts by magnetohydrodynamic simulations based on interplanetary scintillation observations Iwai, Kazumasa, Shiota, Daikou, Tokumaru, Munetoshi, Fujiki, Ken'ichi, Den, Mitsue & Kubo, Yûki, 2021, Earth, Planets and Space, 73, 9
26	Solar ALMA Observations: Constraining the Chromosphere above Sunspots Loukitcheva, Maria A., Iwai, Kazumasa, Solanki, Sami K., White, Stephen M. & Shimojo, Masumi, 2017, ApJ, 850, 35
24	Development of a coronal mass ejection arrival time forecasting system using interplanetary scintillation observations Iwai, Kazumasa, Shiota, Daikou, Tokumaru, Munetoshi, Fujiki, Ken'ichi, Den, Mitsue & Kubo, Yûki, 2019, Earth, Planets and Space, 71, 39
22	Coronal magnetic field and the plasma beta determined from radio and multiple satellite observations Iwai, Kazumasa, Shibasaki, Kiyoto, Nozawa, Satoshi, Takahashi, Takuya, Sawada, Shinpei, Kitagawa, Jun, Miyawaki, Shun & Kashiwagi, Hirotaka, 2014, Earth, Planets and Space, 66, 149
22	Solar Radio Type-I Noise Storm Modulated by Coronal Mass Ejections Iwai, K., Miyoshi, Y., Masuda, S., Shimojo, M., Shiota, D., Inoue, S., Tsuchiya, F., Morioka, A. & Misawa, H., 2012, ApJ, 744, 167
21	Detection of Propagating Fast Sausage Waves through Detailed Analysis of a Zebra-pattern Fine Structure in a Solar Radio Burst Kaneda, K., Misawa, H., Iwai, K., Masuda, S., Tsuchiya, F., Katoh, Y. & Obara, T., 2018, ApJ, 855, L29
20	OCTAD-S: digital fast Fourier transform spectrometers by FPGA Iwai, Kazumasa, Kubo, Yûki, Ishibashi, Hiromitsu, Naoi, Takahiro, Harada, Kenichi, Ema, Kenji, Hayashi, Yoshinori & Chikahiro, Yuichi, 2017, Earth, Planets and Space, 69, 95
19	Observation of the Chromospheric Sunspot at Millimeter Range with the Nobeyama 45 m Telescope Iwai, Kazumasa & Shimojo, Masumi, 2015, ApJ, 804, 48
19	The Brightness Temperature of the Quiet Solar Chromosphere at 2.6 mm Iwai, Kazumasa, Shimojo, Masumi, Asayama, Shinichiro, Minamidani, Tetsuhiro, White, Stephen, Bastian, Timothy & Saito, Masao, 2017, Solar Physics, 292, 22
18	ALMA Discovery of Solar Umbral Brightness Enhancement at λ = 3 mm Iwai, Kazumasa, Loukitcheva, Maria, Shimojo, Masumi, Solanki, Sami K. & White, Stephen M., 2017, ApJ, 841, L20
18	Estimating the Temperature and Density of a Spicule from 100 GHz Data Obtained with ALMA Shimojo, Masumi, Kawate, Tomoko, Okamoto, Takenori J., Yokoyama, Takaaki, Narukage, Noriyuki, Sakao, Taro, Iwai, Kazumasa, Fleishman, Gregory D. & Shibata, Kazunari, 2020, ApJ, 888, L28
18	Peak Flux Distributions of Solar Radio Type-i Bursts from Highly Resolved Spectral Observations Iwai, K., Masuda, S., Miyoshi, Y., Tsuchiya, F., Morioka, A. & Misawa, H., 2013, ApJ, 768, L2
17	Chromospheric Sunspots in the Millimeter Range as Observed by the Nobeyama Radioheliograph Iwai, Kazumasa, Koshiishi, Hideki, Shibasaki, Kiyoto, Nozawa, Satoshi, Miyawaki, Shun & Yoneya, Takuro, 2016, ApJ, 816, 91
16	Spectral Structures and Their Generation Mechanisms for Solar Radio Type-I Bursts Iwai, K., Miyoshi, Y., Masuda, S., Tsuchiya, F., Morioka, A. & Misawa, H., 2014, ApJ, 789, 4
16	Variation of the Solar Microwave Spectrum in the Last Half Century Shimojo, Masumi, Iwai, Kazumasa, Asai, Ayumi, Nozawa, Satoshi, Minamidani, Tetsuhiro & Saito, Masao, 2017, ApJ, 848, 62
14	Over seven decades of solar microwave data obtained with Toyokawa and Nobeyama Radio Polarimeters Shimojo, Masumi & Iwai, Kazumasa, 2023, Geoscience Data Journal, 10, 114
14	Measurements of Coronal and Chromospheric Magnetic Fields using Polarization Observations by the Nobeyama Radioheliograph Iwai, Kazumasa & Shibasaki, Kiyoto, 2013, Publications of the Astronomical Society of Japan, 65, S14
14	Coronal Magnetic Fields Derived from Simultaneous Microwave and EUV Observations and Comparison with the Potential Field Model Miyawaki, Shun, iwai, Kazumasa, Shibasaki, Kiyoto, Shiota, Daikou & Nozawa, Satoshi, 2016, ApJ, 818, 8
13	BepiColombo's cruise phase: unique opportunity for synergistic observations Hadid, L. Z., Génot, V., Aizawa, S., Milillo, A., Zender, J., Murakami, G., Benkhoff, J., Zouganelis, I., Alberti, T., André, N., Bebesi, Z., Califano, F., Dimmock, A. P., Dosa, M., Escoubet, C. P., Griton, L., Ho, G. C., Horbury, T. S., Iwai, K., Janvier, M., Kilpua, E., Lavraud, B., Madar, A., Miyoshi, Y., Müller, D., Pinto, R. F., Rouillard, A. P., Raines, J. M., Raouafi, N., Sahraoui, F., Sánchez-Cano, B., Shiota, D., Vainio, R. & Walsh, A., 2021, Frontiers in Astronomy and Space Sciences, 8, 154
12	Frequency Dependence of Polarization of Zebra Pattern in Type-IV Solar Radio Bursts Kaneda, Kazutaka, Misawa, H., Iwai, K., Tsuchiya, F. & Obara, T., 2015, ApJ, 808, L45
11	PSTEP: project for solar─terrestrial environment prediction Kusano, Kanya, Ichimoto, Kiyoshi, Ishii, Mamoru, Miyoshi, Yoshizumi, Yoden, Shigeo, Akiyoshi, Hideharu, Asai, Ayumi, Ebihara, Yusuke, Fujiwara, Hitoshi, Goto, Tada-Nori, Hanaoka, Yoichiro, Hayakawa, Hisashi, Hosokawa, Keisuke, Hotta, Hideyuki, Hozumi, Kornyanat, Imada, Shinsuke, Iwai, Kazumasa, Iyemori, Toshihiko, Jin, Hidekatsu, Kataoka, Ryuho, Katoh, Yuto, Kikuchi, Takashi, Kubo, Yûki, Kurita, Satoshi, Matsumoto, Haruhisa, Mitani, Takefumi, Miyahara, Hiroko, Miyoshi, Yasunobu, Nagatsuma, Tsutomu, Nakamizo, Aoi, Nakamura, Satoko, Nakata, Hiroyuki, Nishizuka, Naoto, Otsuka, Yuichi, Saito, Shinji, Saito, Susumu, Sakurai, Takashi, Sato, Tatsuhiko, Shimizu, Toshifumi, Shinagawa, Hiroyuki, Shiokawa, Kazuo, Shiota, Daikou, Takashima, Takeshi, Tao, Chihiro, Toriumi, Shin, Ueno, Satoru, Watanabe, Kyoko, Watari, Shinichi, Yashiro, Seiji, Yoshida, Kohei & Yoshikawa, Akimasa, 2021, Earth, Planets and Space, 73, 159
10	Spectral Structures of Type II Solar Radio Bursts and Solar Energetic Particles Iwai, Kazumasa, Yashiro, Seiji, Nitta, Nariaki V. & Kubo, Yûki, 2020, ApJ, 888, 50
9	Forecasting Heliospheric CME Solar-Wind Parameters Using the UCSD Time-Dependent Tomography and ISEE Interplanetary Scintillation Data: The 10 March 2022 CME Jackson, Bernard V., Tokumaru, Munetoshi, Iwai, Kazumasa, Bracamontes, Matthew T., Buffington, Andrew, Fujiki, Ken'ichi, Murakami, Go, Heyner, Daniel, Sanchez-Cano, Beatriz, Rojo, Mathias, Aizawa, Sae, Andre, Nicolas, Barthe, Alain, Penou, Emmanuel, Fedorov, Andrei, Sauvaud, Jean-Andre, Yokota, Shoichiro & Saito, Yoshifumi, 2023, Solar Physics, 298, 74
8	Polarization Characteristics of Zebra Patterns in Type IV Solar Radio Bursts Kaneda, K., Misawa, H., Iwai, K., Tsuchiya, F., Obara, T., Katoh, Y. & Masuda, S., 2017, ApJ, 842, 45
8	Coordinated Interplanetary Scintillation Observations in Japan and Russia for Coronal Mass Ejection Events in Early September 2017 Tokumaru, Munetoshi, Fujiki, Ken'ichi, Iwai, Kazumasa, Tyul'bashev, Sergey & Chashei, Igor, 2019, Solar Physics, 294, 87
8	Solar observing with the Atacama large millimeter-submillimeter array Bastian, T. S., Shimojo, M., Bárta, M., White, S. M. & Iwai, K., 2022, Frontiers in Astronomy and Space Sciences, 9, 977368
7	Generation Mechanism of the Slowly Drifting Narrowband Structure in the Type IV Solar Radio Bursts Observed by Amateras Katoh, Y., Iwai, K., Nishimura, Y., Kumamoto, A., Misawa, H., Tsuchiya, F. & Ono, T., 2014, ApJ, 787, 45
7	Application of novel interplanetary scintillation visualisations using LOFAR: A case study of merged CMEs from September 2017 Fallows, R. A., Iwai, K., Jackson, B. V., Zhang, P., Bisi, M. M. & Zucca, P., 2023, Advances in Space Research, 72, 5311
6	Electron Cyclotron Maser Emission and the Brightest Solar Radio Bursts White, Stephen M., Shimojo, Masumi, Iwai, Kazumasa, Bastian, Timothy S., Fleishman, Gregory D., Gary, Dale E., Magdalenic, Jasmina & Vourlidas, Angelos, 2024, ApJ, 969, 3
5	Comparative Study of Microwave Polar Brightening, Coronal Holes, and Solar Wind over the Solar Poles Fujiki, Ken'ichi, Shibasaki, Kiyoto, Yashiro, Seiji, Tokumaru, Munetoshi, Iwai, Kazumasa & Masuda, Satoshi, 2019, Solar Physics, 294, 30
5	Testing the Alfvén-wave Model of the Solar Wind with Interplanetary Scintillation Shoda, Munehito, Iwai, Kazumasa & Shiota, Daikou, 2022, ApJ, 928, 130
5	Magnetohydrodynamic simulation of coronal mass ejections using interplanetary scintillation data observed from radio sites ISEE and LOFAR Iwai, Kazumasa, Fallows, Richard A., Bisi, Mario M., Shiota, Daikou, Jackson, Bernard V., Tokumaru, Munetoshi & Fujiki, Ken'ichi, 2023, Advances in Space Research, 72, 5328
5	Solar Micro-Type III Burst Storms and Long Dipolar Magnetic Field in the Outer Corona Morioka, A., Miyoshi, Y., Iwai, K., Kasaba, Y., Masuda, S., Misawa, H. & Obara, T., 2015, ApJ, 808, 191
5	Venus's induced magnetosphere during active solar wind conditions at BepiColombo's Venus 1 flyby 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, 2021, Annales Geophysicae, 39, 811
4	Microwave observations of a large-scale coronal wave with the Nobeyama radioheliograph Warmuth, A., Shibasaki, K., Iwai, K. & Mann, G., 2016, A&A, 593, A102
4	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 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., 2024, ApJ, 974, 283
3	BepiColombo cruise science: overview of the mission contribution to heliophysics 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, 2025, Earth, Planets and Space, 77, 114
2	Ground-based Observations of Temporal Variation of the Cosmic-Ray Spectrum during Forbush Decreases 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., 2025, ApJ, 986, L7
2	Interplanetary Scintillation Observations of Solar-Wind Disturbances During Cycles 23 and 24 Tokumaru, Munetoshi, Fujiki, Ken'ichi & Iwai, Kazumasa, 2023, Solar Physics, 298, 22
1	Solar and Interplanetary Determinants of Long-term Solar Modulation of Cosmic-Ray Intensity for Median Rigidities of 11─107 GV Poopakun, K., Nuntiyakul, W., Kato, C., Munakata, K., Kozai, M., Hayashi, Y., Ruffolo, D., Iwai, K., Menjo, H., Zhai, L. M. & Duldig, M. L., 2025, ApJ, 991, 127
1	Comparison of Solar Multifrequency Microwave Data with Other Solar Indices for Understanding Solar and Stellar Microwave Data Shimojo, Masumi, Namekata, Kosuke, Iwai, Kazumasa, Asai, Ayumi & Watanabe, Kyoko, 2024, ApJ, 965, 170
0	East-West Asymmetry in Interplanetary-Scintillation-Level Variation Associated with Solar-Wind Disturbances Tokumaru, Munetoshi, Nagai, Miho, Fujiki, Ken'ichi & Iwai, Kazumasa, 2023, Solar Physics, 298, 127
0	Cosmic-Ray North─South Anisotropy: Rigidity Spectrum and Solar Cycle Variations Observed by Ground-based Muon Detectors 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., 2024, ApJ, 977, 160
0	Real-time monitoring of the rigidity spectrum of large Forbush decreases in May and October 2024 with the paired neutron monitor and muon detector at the Antarctic Syowa Station Hayashi, Yuki, Munakata, Kazuoki, Kozai, Masayoshi, Kataoka, Ryuho, Kadokura, Akira, Kato, Chihiro, Miyashita, Naoko, Miyake, Shoko, Murase, Kiyoka, Duldig, Marcus L., Ruffolo, David, Mitthumsiri, Warit, Muangha, Pradiphat, Sáiz, Alejandro, Seunarine, Surujdheo, Evenson, Paul A., Mangeard, Pierre-Simon, Iwai, Kazumasa, Menjo, Hiroaki, Echer, Ezequiel, Lago, Alisson Dal, Rockenbach, Marlos, Schuch, Nelson Jorge, Bageston, Jose V., Braga, Carlos Roberto, Jassar, Hala Khalid Al, Sharma, Madan Mohan, Burahmah, Naser, Zaman, Fahad, Sabbah, Ismail, Kuwabara, Takao, Chen, Ding & Huang, Jing, 2026, Earth, Planets and Space, 78, 75
0	Automatic Detection of Type II Solar Radio Burst by Using 1-D Convolution Neutral Network Cho, Kyung-Suk, Kim, Junyoung, Kim, Rok-Soon, Park, Eunsu, Kubo, Yûki & Iwai, Kazumasa, 2023, Journal of Korean Astronomical Society, 56, 213