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Your search keyword '"Matsuda, S."' showing total 19 results
Start Over Author "Matsuda, S." Journal geophysical research letters
19 results on '"Matsuda, S."'

1. Quantifying the Size and Duration of a Microburst‐Producing Chorus Region on 5 December 2017

Author

Elliott, S. S., primary, Breneman, A. W., additional, Colpitts, C., additional, Pettit, J. M., additional, Cattell, C. A., additional, Halford, A. J., additional, Shumko, M., additional, Sample, J., additional, Johnson, A. T., additional, Miyoshi, Y., additional, Kasahara, Y., additional, Cully, C. M., additional, Nakamura, S., additional, Mitani, T., additional, Hori, T., additional, Shinohara, I., additional, Shiokawa, K., additional, Matsuda, S., additional, Connors, M., additional, Ozaki, M., additional, and Manninen, J., additional

Published
2022
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2. Multipoint Measurement of Fine‐Structured EMIC Waves by Arase, Van Allen Probe A, and Ground Stations

Author

Matsuda, S., primary, Miyoshi, Y., additional, Kasahara, Y., additional, Blum, L., additional, Colpitts, C., additional, Asamura, K., additional, Kasaba, Y., additional, Matsuoka, A., additional, Tsuchiya, F., additional, Kumamoto, A., additional, Teramoto, M., additional, Nakamura, S., additional, Kitahara, M., additional, Shinohara, I., additional, Reeves, G., additional, Spence, H., additional, Shiokawa, K., additional, Nagatsuma, T., additional, Oyama, S., additional, and Mann, I. R., additional

Published
2021
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3. Arase Observation of Simultaneous Electron Scatterings by Upper‐Band and Lower‐Band Chorus Emissions

Author

Kazama, Y., primary, Miyoshi, Y., additional, Kojima, H., additional, Kasahara, Y., additional, Kasahara, S., additional, Usui, H., additional, Wang, B.‐J., additional, Wang, S.‐Y., additional, Tam, S. W. Y., additional, Chang, T. F., additional, Asamura, K., additional, Matsuda, S., additional, Kumamoto, A., additional, Tsuchiya, F., additional, Kasaba, Y., additional, Shoji, M., additional, Matsuoka, A., additional, Teramoto, M., additional, Takashima, T., additional, and Shinohara, I., additional

Published
2021
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4. Longitudinal Structure of Oxygen Torus in the Inner Magnetosphere: Simultaneous Observations by Arase and Van Allen Probe A

Author

Nosé, M., Matsuoka, A., Kumamoto, A., Kasahara, Y., Goldstein, J., Teramoto, M., Tsuchiya, F., Matsuda, S., Shoji, M., Imajo, S., Oimatsu, S., Yamamoto, K., Obana, Y., Nomura, R., Fujimoto, A., Shinohara, I., Miyoshi, Y., Kurth, W. S., Kletzing, C. A., Smith, C. W., and MacDowall, R. J.

Subjects
Arase satellite, geomagnetic storm, inner magnetosphere, oxygen torus, simultaneous observation, Van Allen Probes satellite
Abstract

Simultaneous observations of the magnetic field and plasma waves made by the Arase and Van Allen Probe A satellites at different magnetic local time (MLT) enable us to deduce the longitudinal structure of an oxygen torus for the first time. During 04:00–07:10 UT on 24 April 2017, Arase flew from L = 6.2 to 2.0 in the morning sector and detected an enhancement of the average plasma mass up to ~3.5 amu around L = 4.9–5.2 and MLT = 5.0 hr, implying that the plasma consists of approximately 15% O^+ ions. Probe A moved outbound from L = 2.0 to 6.2 in the afternoon sector during 04:10–07:30 UT and observed no clear enhancements in the average plasma mass. For this event, the O^+ density enhancement in the inner magnetosphere (i.e., oxygen torus) does not extend over all MLT but is skewed toward the dawn, being described more precisely as a crescent‐shaped torus or a pinched torus., ファイル公開：2019-04-16

Published
2018

5. Extremely Collimated Electron Beams in the High Latitude Magnetosphere Observed by Arase

Author

Kazama, Y., primary, Kojima, H., additional, Miyoshi, Y., additional, Kasahara, Y., additional, Kasahara, S., additional, Usui, H., additional, Wang, B.‐J., additional, Wang, S.‐Y., additional, Tam, S. W. Y., additional, Chang, T.‐F., additional, Asamura, K., additional, Kasaba, Y., additional, Matsuda, S., additional, Shoji, M., additional, Matsuoka, A., additional, Teramoto, M., additional, Takashima, T., additional, and Shinohara, I., additional

Published
2021
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6. Pitch‐Angle Scattering of Inner Magnetospheric Electrons Caused by ECH Waves Obtained With the Arase Satellite

Author

Fukizawa, M., primary, Sakanoi, T., additional, Miyoshi, Y., additional, Kazama, Y., additional, Katoh, Y., additional, Kasahara, Y., additional, Matsuda, S., additional, Matsuoka, A., additional, Kurita, S., additional, Shoji, M., additional, Teramoto, M., additional, Imajo, S., additional, Sinohara, I., additional, Wang, S.‐Y., additional, Tam, S. W.‐Y., additional, Chang, T.‐F., additional, Wang, B.‐J., additional, and Jun, C.‐W., additional

Published
2020
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8. EMIC Waves Converted From Equatorial Noise Due to M / Q = 2 Ions in the Plasmasphere: Observations From Van Allen Probes and Arase

Author

Miyoshi, Y., primary, Matsuda, S., additional, Kurita, S., additional, Nomura, K., additional, Keika, K., additional, Shoji, M., additional, Kitamura, N., additional, Kasahara, Y., additional, Matsuoka, A., additional, Shinohara, I., additional, Shiokawa, K., additional, Machida, S., additional, Santolik, O., additional, Boardsen, S. A., additional, Horne, R. B., additional, and Wygant, J. F., additional

Published
2019
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9. Temporal and Spatial Correspondence of Pc1/EMIC Waves and Relativistic Electron Precipitations Observed With Ground‐Based Multi‐Instruments on 27 March 2017

Author

Hirai, A., primary, Tsuchiya, F., additional, Obara, T., additional, Kasaba, Y., additional, Katoh, Y., additional, Misawa, H., additional, Shiokawa, K., additional, Miyoshi, Y., additional, Kurita, S., additional, Matsuda, S., additional, Connors, M., additional, Nagatsuma, T., additional, Sakaguchi, K., additional, Kasahara, Y., additional, Kumamoto, A., additional, Matsuoka, A., additional, Shoji, M., additional, Shinohara, I., additional, and Albert, J. M., additional

Published
2018
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10. Electrostatic Electron Cyclotron Harmonic Waves as a Candidate to Cause Pulsating Auroras

Author

Fukizawa, M., primary, Sakanoi, T., additional, Miyoshi, Y., additional, Hosokawa, K., additional, Shiokawa, K., additional, Katoh, Y., additional, Kazama, Y., additional, Kumamoto, A., additional, Tsuchiya, F., additional, Miyashita, Y., additional, Tanaka, Y. ‐M., additional, Kasahara, Y., additional, Ozaki, M., additional, Matsuoka, A., additional, Matsuda, S., additional, Hikishima, M., additional, Oyama, S., additional, Ogawa, Y., additional, Kurita, S., additional, and Fujii, R., additional

Published
2018
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11. Microscopic Observations of Pulsating Aurora Associated With Chorus Element Structures: Coordinated Arase Satellite‐PWING Observations

Author

Ozaki, M., primary, Shiokawa, K., additional, Miyoshi, Y., additional, Hosokawa, K., additional, Oyama, S., additional, Yagitani, S., additional, Kasahara, Y., additional, Kasaba, Y., additional, Matsuda, S., additional, Kataoka, R., additional, Ebihara, Y., additional, Ogawa, Y., additional, Otsuka, Y., additional, Kurita, S., additional, Moore, R. C., additional, Tanaka, Y.‐M., additional, Nosé, M., additional, Nagatsuma, T., additional, Connors, M., additional, Nishitani, N., additional, Katoh, Y., additional, Hikishima, M., additional, Kumamoto, A., additional, Tsuchiya, F., additional, Kadokura, A., additional, Nishiyama, T., additional, Inoue, T., additional, Imamura, K., additional, Matsuoka, A., additional, and Shinohara, I., additional

Published
2018
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13. Density Depletions Associated With Enhancements of Electron Cyclotron Harmonic Emissions: An ERG Observation

Author

Kazama, Y., primary, Kojima, H., additional, Miyoshi, Y., additional, Kasahara, Y., additional, Usui, H., additional, Wang, B.‐J., additional, Wang, S.‐Y., additional, Tam, S. W. Y., additional, Chang, T.‐F., additional, Ho, P. T. P., additional, Asamura, K., additional, Kumamoto, A., additional, Tsuchiya, F., additional, Kasaba, Y., additional, Matsuda, S., additional, Shoji, M., additional, Matsuoka, A., additional, Teramoto, M., additional, Takashima, T., additional, and Shinohara, I., additional

Published
2018
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15. EMIC Waves Converted From Equatorial Noise Due to M/Q = 2 Ions in the Plasmasphere: Observations From Van Allen Probes and Arase.

Author

Miyoshi, Y., Matsuda, S., Kurita, S., Nomura, K., Keika, K., Shoji, M., Kitamura, N., Kasahara, Y., Matsuoka, A., Shinohara, I., Shiokawa, K., Machida, S., Santolik, O., Boardsen, S. A., Horne, R. B., and Wygant, J. F.

Subjects
*PLASMASPHERE, *ELECTROMAGNETIC devices, *IONOSPHERE, *WAVES (Physics), *ALPHA rays
Abstract

Equatorial noise (EN) emissions are observed inside and outside the plasmapause. EN emissions are referred to as magnetosonic mode waves. Using data from Van Allen Probes and Arase, we found conversion from EN emissions to electromagnetic ion cyclotron (EMIC) waves in the plasmasphere and in the topside ionosphere. A low‐frequency part of EN emissions becomes EMIC waves through branch splitting of EN emissions, and the mode conversion from EN to EMIC waves occurs around the frequency of M/Q = 2 (deuteron and/or alpha particles) cyclotron frequency. These processes result in plasmaspheric EMIC waves. We investigated the ion composition ratio by characteristic frequencies of EN emissions and EMIC waves and obtained ion composition ratios. We found that the maximum composition ratio of M/Q = 2 ions is ~10% below 3,000 km. The quantitative estimation of the ion composition will contribute to improving the plasma model of the deep plasmasphere and the topside ionosphere. Plain Language Summary: Equatorial noise (EN) emissions are whistler mode waves. Using Van Allen Probe and Arase (ERG) plasma wave data, we found that EN emissions propagate toward the Earth and are converted to electromagnetic ion cyclotron (EMIC) waves in the deep plasmasphere and the topside ionosphere. We suggest that minor ions with a mass per charge (M/Q) = 2, that is, deuteron or alpha particles, play an important role in this process. The processes reported here are a new generation process of plasmaspheric EMIC waves. Moreover, we determined the ion composition ratio using characteristics of wave dispersion. We derived the altitude profile of the ion composition ratio and identified the maximum ratio of M/Q = 2 ions of about 10% in the deep plasmasphere. Key Points: The first measurements of the conversion from equatorial noise to EMIC waves are presentedExistence of M/Q = 2 ions (deuteron or alpha particle) in the deep plasmasphere is essential to cause the conversionThe ion composition ratio is quantitatively estimated in the deep plasmasphere using characteristics of the wave dispersion [ABSTRACT FROM AUTHOR]

Published
2019
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16. EMIC Waves Converted From Equatorial Noise Due to M/Q= 2 Ions in the Plasmasphere: Observations From Van Allen Probes and Arase

Author

Miyoshi, Y., Matsuda, S., Kurita, S., Nomura, K., Keika, K., Shoji, M., Kitamura, N., Kasahara, Y., Matsuoka, A., Shinohara, I., Shiokawa, K., Machida, S., Santolik, O., Boardsen, S. A., Horne, R. B., and Wygant, J. F.

Abstract

Equatorial noise (EN) emissions are observed inside and outside the plasmapause. EN emissions are referred to as magnetosonic mode waves. Using data from Van Allen Probes and Arase, we found conversion from EN emissions to electromagnetic ion cyclotron (EMIC) waves in the plasmasphere and in the topside ionosphere. A low‐frequency part of EN emissions becomes EMIC waves through branch splitting of EN emissions, and the mode conversion from EN to EMIC waves occurs around the frequency of M/Q= 2 (deuteron and/or alpha particles) cyclotron frequency. These processes result in plasmaspheric EMIC waves. We investigated the ion composition ratio by characteristic frequencies of EN emissions and EMIC waves and obtained ion composition ratios. We found that the maximum composition ratio of M/Q= 2 ions is ~10% below 3,000 km. The quantitative estimation of the ion composition will contribute to improving the plasma model of the deep plasmasphere and the topside ionosphere. Equatorial noise (EN) emissions are whistler mode waves. Using Van Allen Probe and Arase (ERG) plasma wave data, we found that EN emissions propagate toward the Earth and are converted to electromagnetic ion cyclotron (EMIC) waves in the deep plasmasphere and the topside ionosphere. We suggest that minor ions with a mass per charge (M/Q) = 2, that is, deuteron or alpha particles, play an important role in this process. The processes reported here are a new generation process of plasmaspheric EMIC waves. Moreover, we determined the ion composition ratio using characteristics of wave dispersion. We derived the altitude profile of the ion composition ratio and identified the maximum ratio of M/Q= 2 ions of about 10% in the deep plasmasphere. The first measurements of the conversion from equatorial noise to EMIC waves are presentedExistence of M/Q= 2 ions (deuteron or alpha particle) in the deep plasmasphere is essential to cause the conversionThe ion composition ratio is quantitatively estimated in the deep plasmasphere using characteristics of the wave dispersion

Published
2019
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19. High‐altitude M/Q=2 ion cyclotron whistlers in the inner magnetosphere observed by the Akebono satellite

Author

Matsuda, S., Kasahara, Y., and Goto, Y.

Abstract

An ion cyclotron whistler is a left‐handed polarized electromagnetic ion cyclotron mode wave converted from a lightning electron whistler. Some ion cyclotron whistlers have been identified as deuteron whistlers. This paper reports M/Q= 2 ion cyclotron whistlers observed by the Akebono satellite in the altitude region around 3200–10000 km (L= 1.5–3.4), which is a considerably higher altitude than those previously reported. This evidence indicates that M/Q= 2 ions are present not only in the low‐altitude region but also in the inner magnetosphere around L= 3.4. We estimated the ion concentration from the crossover frequency of the M/Q= 2 ion cyclotron whistler wave observed in the altitude region around 4200 km (L= 1.7) and concluded that the concentration of M/Q= 2 ions was plausibly up to 12.6% during this event. Our observation results give important clues to study unknown minor ion profiles such as circulation mechanism of deuterons or injection mechanism of alpha particles in the solar wind. M/Q=2 ion cyclotron whistlers were observed by AkebonoThey were discovered at a higher altitude than those previously reportedExistence of certain amounts of M/Q=2 ions around L=1.5–3.4 is demonstrated

Published
2014
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