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DOI | 10.1029/2018GL078825 |
Magnetic Field Dipolarization and Its Associated Ion Flux Variations in the Dawnside Deep Inner Magnetosphere: Arase Observations | |
Nose, M.1; Matsuoka, A.2; Kasahara, S.3; Yokota, S.4; Teramoto, M.5; Keika, K.3; Yamamoto, K.1; Nomura, R.6; Fujimoto, A.7; Higashio, N.6; Koshiishi, H.6; Imajo, S.1; Oimatsu, S.1; Tanaka, Y. -M.8,9,10; Shinohara, M.11; Shinohara, I.2; Miyoshi, Y.5 | |
2018-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:16页码:7942-7950 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | The Arase satellite observed clear dipolarization signatures at r similar to 4.3-4.6 R-E, GMLAT similar to 16 degrees-18 degrees, and MLT similar to 5.5-5.7 hr around 15:00 UT on 27 March 2017 when Dst similar to-70 nT. Strong magnetic field fluctuations were embedded and their characteristic frequency was close to the local gyrofrequency of O+ ions. After the dipolarization, O+ flux was enhanced at <= 15 keV, while H+ flux showed no clear variations. These observations provide evidence for the direct supply of O+ ions from the ionosphere. There were no clear signatures for the nonadiabatic local acceleration of O+ ions. We consider that a bump-on-tail structure in the energy spectrum around 30-50 keV due to a combination of charge exchange loss and drift motion of ions masks the nonadiabatic acceleration. Occurrence of the magnetic field dipolarization at dawn, which is far from the well-known premidnight occurrence peak, may be due to an eastward skewing of partial ring current during the storm main phase. Plain Language Summary The Exploration of energization and Radiation in Geospace (ERG) "Arase" satellite was launched by Japan Aerospace Exploration Agency on 20 December 2016. Arase was placed in an elliptical orbit having initially a perigee of similar to 460-km altitude and an apogee of 6.0 R-E to survey the inner magnetosphere. This unique orbit makes it possible for Arase to successfully observe a clear magnetic field dipolarization and its associated ion flux variations in the dawnside deep inner magnetosphere, which have not been reported in previous studies. Observations provide evidence for the direct supply of O+ ions from the ionosphere to the deep inner magnetosphere. Occurrence of the magnetic field dipolarization at dawn, which is far from the well-known premidnight occurrence peak, may be due to an eastward skewing of partial ring current during the storm main phase. |
英文关键词 | dipolarization inner magnetosphere O+ outflow acceleration partial ring current |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000445612500007 |
WOS关键词 | TAIL CURRENT DISRUPTION ; GEOMAGNETIC STORMS ; ENERGY-SPECTRA ; CURRENT SHEET ; GROWTH-PHASE ; RING CURRENT ; SUBSTORM ; MODELS ; FLUCTUATIONS ; SIGNATURES |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/25656 |
专题 | 气候变化 |
作者单位 | 1.Kyoto Univ, Grad Sch Sci, Kyoto, Japan; 2.Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan; 3.Univ Tokyo, Grad Sch Sci, Tokyo, Japan; 4.Osaka Univ, Grad Sch Sci, Toyonaka, Osaka, Japan; 5.Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan; 6.Japan Aerosp Explorat Agcy, Res & Dev Directorate, Tsukuba, Ibaraki, Japan; 7.Kyushu Inst Technol, Iizuka, Fukuoka, Japan; 8.Natl Inst Polar Res, Tachikawa, Tokyo, Japan; 9.Res Org Informat & Syst, Joint Support Ctr Data Sci Res, Polar Environm Data Sci Ctr, Tachikawa, Tokyo, Japan; 10.Grad Univ Adv Studies, Sch Multidisciplinary Sci, Dept Polar Sci, Tachikawa, Tokyo, Japan; 11.Kagoshima Natl Coll Technol, Kirishima, Japan |
推荐引用方式 GB/T 7714 | Nose, M.,Matsuoka, A.,Kasahara, S.,et al. Magnetic Field Dipolarization and Its Associated Ion Flux Variations in the Dawnside Deep Inner Magnetosphere: Arase Observations[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(16):7942-7950. |
APA | Nose, M..,Matsuoka, A..,Kasahara, S..,Yokota, S..,Teramoto, M..,...&Miyoshi, Y..(2018).Magnetic Field Dipolarization and Its Associated Ion Flux Variations in the Dawnside Deep Inner Magnetosphere: Arase Observations.GEOPHYSICAL RESEARCH LETTERS,45(16),7942-7950. |
MLA | Nose, M.,et al."Magnetic Field Dipolarization and Its Associated Ion Flux Variations in the Dawnside Deep Inner Magnetosphere: Arase Observations".GEOPHYSICAL RESEARCH LETTERS 45.16(2018):7942-7950. |
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