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• Remote Detection of Drift Resonance Between Energetic Electrons and Ultralow Frequency Waves: Multisatellite Coordinated Observation by Arase and Van Allen Probes

  Teramoto M., Hori T., Saito S., Miyoshi Y., Kurita S., Higashio N., Matsuoka A., Kasahara Y., Kasaba Y., Takashima T., Nomura R., Nosé M., Fujimoto A., Tanaka Y., Shoji M., Tsugawa Y., Shinohara M., Shinohara I., Blake J., Fennell J., Claudepierre S., Turner D., Kletzing C., Sormakov D., Troshichev O.

  Geophysical Research Letters      2019年11月  [査読有り]

   概要を見る

  ©2019. American Geophysical Union. All Rights Reserved. We report the electron flux modulations without corresponding magnetic fluctuations from unique multipoint satellite observations of the Arase (Exploration of Energization and Radiation in Geospace) and the Van Allen Probe (Radiation Belt Storm Probe [RBSP])-B satellites. On 30 March 2017, both Arase and RBSP-B observed periodic fluctuations in the relativistic electron flux with energies ranging from 500 keV to 2 MeV when they were located near the magnetic equator in the morning and dusk local time sectors, respectively. Arase did not observe Pc5 pulsations, while they were observed by RBSP-B. The clear dispersion signature of the relativistic electron fluctuations observed by Arase indicates that the source region is limited to the postnoon to the dusk sector. This is confirmed by RBSP-B and ground-magnetometer observations, where Pc5 pulsations are observed to drift-resonate with relativistic electrons on the duskside. Thus, Arase observed the drift-resonance signatures “remotely,” whereas RBSP-B observed them “locally.”.

  DOI Scopus

• Direct Comparison Between Magnetospheric Plasma Waves and Polar Mesosphere Winter Echoes in Both Hemispheres

  Tanaka Y., Nishiyama T., Kadokura A., Ozaki M., Miyoshi Y., Shiokawa K., Oyama S., Kataoka R., Tsutsumi M., Nishimura K., Sato K., Kasahara Y., Kumamoto A., Tsuchiya F., Fukizawa M., Hikishima M., Matsuda S., Matsuoka A., Shinohara I., Nosé M., Nagatsuma T., Shinohara M., Fujimoto A., Teramoto M., Nomura R., Yukimatu A., Hosokawa K., Shoji M., Latteck R.

  Journal of Geophysical Research: Space Physics      2019年10月  [査読有り]

   概要を見る

  ©2019. American Geophysical Union. All Rights Reserved. We present the first and direct comparison between magnetospheric plasma waves and polar mesosphere winter echoes (PMWE) simultaneously observed by the conjugate observation with Arase satellite and high-power atmospheric radars in both hemispheres, namely, the Program of the Antarctic Syowa Mesosphere, Stratosphere, and Troposphere/Incoherent Scatter Radar at Syowa Station (SYO; −69.00°S, 39.58°E), Antarctica, and the Middle Atmosphere Alomar Radar System at Andøya (AND; 69.30°N, 16.04°E), Norway. The PMWE were observed during 03–07 UT on 21 March 2017, just after the arrival of corotating interaction region in front of high-speed solar wind stream. An isolated substorm occurred at 04 UT during this interval. Electromagnetic ion cyclotron (EMIC) waves and whistler mode chorus waves were simultaneously observed near the magnetic equator and showed similar temporal variations to that of the PMWE. These results indicate that chorus waves as well as EMIC waves are drivers of precipitation of energetic electrons, including relativistic electrons, which make PMWE detectable at 55- to 80-km altitude. Cosmic noise absorption measured with a 38.2-MHz imaging riometer and low-altitude echoes at 55–70 km measured with an medium-frequency radar at SYO also support the relativistic electron precipitation. We suggest a possible scenario in which the various phenomena observed in near-Earth space, such as magnetospheric plasma waves (EMIC waves and chorus waves), pulsating auroras, cosmic noise absorption, and PMWE, can be explained by the interaction between the high-speed solar wind containing corotating interaction regions and the magnetosphere.

  DOI Scopus

• Statistical Properties of Molecular Ions in the Ring Current Observed by the Arase (ERG) Satellite

  Seki K., Keika K., Kasahara S., Yokota S., Hori T., Asamura K., Higashio N., Takada M., Ogawa Y., Matsuoka A., Teramoto M., Miyoshi Y., Shinohara I.

  Geophysical Research Letters      2019年08月  [査読有り]

   概要を見る

  ©2019. American Geophysical Union. All Rights Reserved. Molecular ions in the magnetosphere can be a tracer of fast ion outflows from the deep ionosphere. Statistical properties of molecular ions (O2+/NO+/N2+) in the ring current are investigated based on ion composition measurements (<180 keV/q) by medium-energy particle experiments-electron analyzer and low-energy particle experiments-ion mass analyzer instruments on board the Arase (Exploration of energization and Radiation in Geospace, ERG) satellite. The investigated period from late March to December 2017 includes 11 geomagnetic storms with the minimum Dst index less than −40 nT. The molecular ions are observed in the region of L = 2.5–6.6 and clearly identified at energies above ~12 keV during most magnetic storms. During quiet times, molecular ions are not observed. The average energy density ratio of the molecular ions to O+ is ~3%. The ratio tends to increase with the size of magnetic storms. Existence of molecular ions even during small magnetic storms suggests that the fast ion outflow from the deep ionosphere occurs frequently during geomagnetically active periods.

  DOI Scopus

• Meridional Distribution of Middle-Energy Protons and Pressure-Driven Currents in the Nightside Inner Magnetosphere: Arase Observations

  Imajo S., Nosé M., Kasahara S., Yokota S., Matsuoka A., Keika K., Hori T., Teramoto M., Yamamoto K., Oimatsu S., Nomura R., Fujimoto A., Shinohara I., Miyoshi Y.

  Journal of Geophysical Research: Space Physics    124 ( 7 ) 5719 - 5733   2019年07月  [査読有り]

   概要を見る

  ©2019. American Geophysical Union. All Rights Reserved. We examined the average meridional distribution of middle-energy protons (10–180 keV) and pressure-driven currents in the nightside (20–04 hr magnetic local time) ring current region during moderately disturbed times using the Arase satellite's data. Because the Arase satellite has a large inclination orbit of 31°, it covers the magnetic latitude (MLAT) in the range of −40° to 40° and a radial distance of <6RE. We found that the plasma pressure decreased significantly with increasing MLAT. The plasma pressure on the same L* shell at 30° < MLAT < 40° was ∼10–60% of that at 0° < 4 MLAT < 10°, and the rate of decrease was larger on lower L* shells. The pressure anisotropy, derived as the perpendicular pressure divided by the parallel pressure minus 1, decreased with radial distance and showed a weak dependence on MLAT. The magnitude of the plasma beta at 30°<MLAT<40° was 1 or 2 orders smaller than that at 0°<MLAT<10°. The plasma pressure normalized by the value at 0°<MLAT<10° estimated from the magnetic strength and anisotropy was roughly consistent with the observed plasma pressure for L*=3.5–5.5. The azimuthal pressure-gradient current derived from the plasma pressure was distributed over MLAT∼0–20°, while the curvature current was limited within MLAT∼0–10°. We suggest that the latitudinal dependence should be taken into account in interpretations of plasma parameters in successive orbits during magnetic storms.

  DOI Scopus

• DC component of spacecraft-origin magnetic field noise at the Arase/MGF sensor: (1) Evaluation with Tsyganenko 89 model

  Kazuhiro Yamamoto, Satoshi Oimatsu, Masahito Nose, Ayako Matsuoka, Mariko Teramoto, and Sun Imajo,

  JAXA Research and Development Report      2019年03月  [査読有り]

   概要を見る

  We investigated the difference between the magnetic field observed by the Arase spacecraft and the Tsyganenko 89 model field (ΔB) during geomagnetic quiet period to determine the DC component of spacecraft-origin magnetic field noise at the position of Magnetic Field Experiment (MGF) onboard the Arase spacecraft. The median value of the Z-component of ΔB in the Despun Sun sector Inertia (DSI) coordinates is very small (-0.6 nT); therefore, MGF has a good magnetic field cleanness and is well-calibrated. We also found that the Z-component of the magnetic field in the SM coordinate system observed by Arase is usually larger than that of the model field by - 3 nT. The difference between time periods for the data used in this study and for the data to create the Tsyganenko 89 model may cause the discrepancy.

  DOI

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• Pi2 pulsations observed by the Arase satellite inside and outside the plasmasphere

  M. Teramoto, A. Matsuoka, Y. Kasahara, Y. Kasaba, A. Kumamoto, F. Tsuchiya, S. Matsuda, M. Nosé, R. Nomura, S. Kurita, M. Shoji, S. Imajo, Y. Miyoshi, and I. Shinohara

  2020 ERG Science and Space Weather Workshop  (NCU, Taiwan)  2020年01月  -  2020年01月   

• ERG (あらせ) プロジェクト: ERGサイエンスセンター (ERG-SC)

  堀 智昭 , 三好 由純, 栗田 怜, Jun Chae-Woo, 小路 真史, 梅村 宜生, 瀬川 朋紀, 近藤 誉子, 塩川 和夫, 寺本 万里子, 桂華 邦裕 , 関 華奈子, 田中 良昌, 松田 昇也, 篠原 育, 浅村 和史

  第20回 宇宙科学シンポジウム  (相模原, 神奈川, 日本)  2020年01月  -  2020年01月   

• Pi2 pulsations observed by the Arase satellite inside and outside the plasmapause

  Mariko Teramoto, Ayako Matsuoka, Yoshiya Kasahara, Yasumasa Kasaba4, Atsushi Kumamoto, Fuminori Tsuchiya, Shoya Matsuda, Masahito Nose, Reiko Nomura, Satoshi Kurita, Masafumi Shoji, Shun Imajo, Yoshizumi Miyoshi and Iku Shinohara

  AGU Fall Meeting 2019  (San Fransisco, California, USA)  2019年12月  -  2019年12月   

• Spatial extent of quasi-periodic emission simultaneously observed by Arase and Van Allen Probes on November 29, 2018.

  Claudia Martinez-Calderon, Frantisek Nemec, Yuto Katoh, Kazuo Shiokawa, Yoshiya Kasahara, Shoya Matsuda, Fuminori Tsuchiya, Atsushi Kumamoto, Mariko Teramoto, Ayako Matsuoka, Yoshizumi Miyoshi, Ondrej Santolik and George B Hospodarsky

  AGU Fall Meeting 2019  (San Fransisco)  2019年12月  -  2019年12月   

• Direct detection of nonlinear generation process of electromagnetic ion cyclotron emissions observed by the Arase spacecraft

  Masafumi Shoji, Yoshizumi Miyoshi, Lynn M Kistler, Kazushi Asamura, Yasumasa Kasaba, Shoya Matsuda, Yoshiya Kasahara, Ayako Matsuoka, Mariko Teramoto, Takeshi Takashima and Iku Shinohara

  AGU Fall Meeting 2019  (San Fransisco)  2019年12月  -  2019年12月   

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• 井上研究奨励賞

  2013年02月   井上科学振興財団   日本国

  受賞者：  寺本万里子

• 学生発表賞

  2007年03月   地球電磁気・地球惑星圏学会   日本国

  受賞者：  寺本万里子

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• 複数衛星を用いた地磁気脈動指数の導出

  基盤研究(C)

  研究期間:  2019年03月  -  2022年03月

  研究課題番号:  19K03948