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  1. Content type: Full paper

    This paper presents detailed performance values of the Magnetic Search Coil (MSC) that is part of the Plasma Wave Experiment on board the Arase (ERG) satellite. The MSC consists of a three-axis search coil mag...

    Authors: Mitsunori Ozaki, Satoshi Yagitani, Yoshiya Kasahara, Hirotsugu Kojima, Yasumasa Kasaba, Atsushi Kumamoto, Fuminori Tsuchiya, Shoya Matsuda, Ayako Matsuoka, Takashi Sasaki and Takahiro Yumoto

    Citation: Earth, Planets and Space 2018 70:76

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  2. Content type: Full paper

    We developed the onboard processing software for the Plasma Wave Experiment (PWE) onboard the Exploration of energization and Radiation in Geospace, Arase satellite. The PWE instrument has three receivers: El...

    Authors: Shoya Matsuda, Yoshiya Kasahara, Hirotsugu Kojima, Yasumasa Kasaba, Satoshi Yagitani, Mitsunori Ozaki, Tomohiko Imachi, Keigo Ishisaka, Atsushi Kumamoto, Fuminori Tsuchiya, Mamoru Ota, Satoshi Kurita, Yoshizumi Miyoshi, Mitsuru Hikishima, Ayako Matsuoka and Iku Shinohara

    Citation: Earth, Planets and Space 2018 70:75

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  3. Content type: Full paper

    We studied the assimilation of high-resolution precipitable water vapor (PWV) data derived from a hyper-dense global navigation satellite system network around Uji city, Kyoto, Japan, which had a mean inter-st...

    Authors: Masanori Oigawa, Toshitaka Tsuda, Hiromu Seko, Yoshinori Shoji and Eugenio Realini

    Citation: Earth, Planets and Space 2018 70:74

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  4. Content type: Full paper

    Substorm onset has originally been defined as a longitudinally extended sudden auroral brightening (Akasofu initial brightening: AIB) followed a few minutes later by an auroral poleward expansion in ground-bas...

    Authors: Akimasa Ieda, Kirsti Kauristie, Yukitoshi Nishimura, Yukinaga Miyashita, Harald U. Frey, Liisa Juusola, Daniel Whiter, Masahito Nosé, Matthew O. Fillingim, Farideh Honary, Neil C. Rogers, Yoshizumi Miyoshi, Tsubasa Miura, Takahiro Kawashima and Shinobu Machida

    Citation: Earth, Planets and Space 2018 70:73

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  5. Content type: Full paper

    We investigate a volcanic hydrothermal system using numerical simulations, focusing on change in crater temperature. Both increases and decreases in crater temperature have been observed before phreatic erupti...

    Authors: Ryo Tanaka, Takeshi Hashimoto, Nobuo Matsushima and Tsuneo Ishido

    Citation: Earth, Planets and Space 2018 70:72

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  6. Content type: Full paper

    Arase is a small scientific satellite program conducted by the Institute of Space and Astronautical Science/Japan Aerospace Exploration Agency, which is dedicated to the detailed study of the radiation belts a...

    Authors: Takeshi Takashima, Emiko Ogawa, Kazushi Asamura and Mitsuru Hikishima

    Citation: Earth, Planets and Space 2018 70:71

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  7. Content type: Full paper

    The medium-energy particle experiments—electron analyzer onboard the exploration of energization and radiation in geospace spacecraft measures the energy and direction of each incoming electron in the energy r...

    Authors: Satoshi Kasahara, Shoichiro Yokota, Takefumi Mitani, Kazushi Asamura, Masafumi Hirahara, Yasuko Shibano and Takeshi Takashima

    Citation: Earth, Planets and Space 2018 70:69

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  8. Content type: Full paper

    The 2015 eruption of Hakone volcano was a very small phreatic eruption, with total erupted ash estimated to be in the order of only 102 m3 and ballistic blocks reaching less than 30 m from the vent. Precursors, ...

    Authors: Kazutaka Mannen, Yohei Yukutake, George Kikugawa, Masatake Harada, Kazuhiro Itadera and Jun Takenaka

    Citation: Earth, Planets and Space 2018 70:68

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  9. Content type: Full paper

    The thermal signature of Aso Volcano (Nakadake) during unrest episodes has been analyzed by combining the MODIS-MIROVA data set (2000–2017) with high-resolution images (LANDSAT 8 OLI and Sentinel 2) and ground...

    Authors: Corrado Cigolini, Diego Coppola, Akihiko Yokoo and Marco Laiolo

    Citation: Earth, Planets and Space 2018 70:67

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  10. Content type: Express Letter

    On 29 June 2015, a small phreatic eruption occurred at Hakone volcano, Central Japan, forming several vents in the Owakudani geothermal area on the northern slope of the central cones. Intense earthquake swarm...

    Authors: Ryokei Yoshimura, Yasuo Ogawa, Yohei Yukutake, Wataru Kanda, Shogo Komori, Hideaki Hase, Tada-nori Goto, Ryou Honda, Masatake Harada, Tomoya Yamazaki, Masato Kamo, Shingo Kawasaki, Tetsuya Higa, Takeshi Suzuki, Yojiro Yasuda, Masanori Tani…

    Citation: Earth, Planets and Space 2018 70:66

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  11. Content type: Express Letter

    Remote sampling of water from Yugama crater lake at Kusatsu-Shirane volcano, Japan, was performed using a drone. Despite the high altitude of over 2000 m above sea level, our simple method was successful in re...

    Authors: Akihiko Terada, Yuichi Morita, Takeshi Hashimoto, Toshiya Mori, Takeshi Ohba, Muga Yaguchi and Wataru Kanda

    Citation: Earth, Planets and Space 2018 70:64

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  12. Content type: Full paper

    Although the 2015 Hakone Volcano eruption was a small-scale phreatic eruption with a discharged mass of only about 100 tons, interferometric synthetic aperture radar successfully detected surface deformations ...

    Authors: Ryosuke Doke, Masatake Harada, Kazutaka Mannen, Kazuhiro Itadera and Jun Takenaka

    Citation: Earth, Planets and Space 2018 70:63

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  13. Content type: Full paper

    The 2016 moment magnitude (Mw) 7.8 Kaikoura earthquake demonstrated that multiple fault segments can undergo rupture during a single seismic event. Here, we employ Global Positioning System (GPS) observations ...

    Authors: Zhongshan Jiang, Dingfa Huang, Linguo Yuan, Abubakr Hassan, Lupeng Zhang and Zhongrong Yang

    Citation: Earth, Planets and Space 2018 70:62

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  14. Content type: Full paper

    When working with ultra-low-frequency (ULF) magnetic datasets, as with most geophysical time-series data, it is important to be able to distinguish between cultural signals, internal instrument noise, and natu...

    Authors: Can Wang, Chen Bin, Lilianna E. Christman, Jonathan M. G. Glen, Simon L. Klemperer, Darcy K. McPhee, Karl N. Kappler, Tom E. Bleier and J. Clark Dunson

    Citation: Earth, Planets and Space 2018 70:57

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  15. Content type: Full paper

    Tectonic and volcanic structures of the northern Ryukyu arc are investigated on the basis of multichannel seismic (MCS) reflection data. The study area forms an active volcanic front in parallel to the non-vol...

    Authors: Ryuta Arai, Shuichi Kodaira, Tsutomu Takahashi, Seiichi Miura and Yoshiyuki Kaneda

    Citation: Earth, Planets and Space 2018 70:61

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  16. Content type: Full paper

    Ionospheric irregularities are an important phenomenon in scientific studies and applications of radio-wave propagation. Spread-F echoes in ionograms are a type of high-frequency band irregularities that inclu...

    Authors: Ning Wang, Lixin Guo, Zhenwei Zhao, Zonghua Ding and Leke Lin

    Citation: Earth, Planets and Space 2018 70:59

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  17. Content type: Full paper

    In this paper, we propose an inverse method for full gravity gradient tensor data in the spherical coordinate system. As opposed to the traditional gravity inversion in the Cartesian coordinate system, our pro...

    Authors: Yi Zhang, Yulong Wu, Jianguo Yan, Haoran Wang, J. Alexis P. Rodriguez and Yue Qiu

    Citation: Earth, Planets and Space 2018 70:58

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  18. Content type: Full paper

    On August 8, 2017, the Jiuzhaigou Mw 6.5 earthquake occurred in Sichuan province, southwestern China, along the eastern margin of the Tibetan Plateau. The epicenter is surrounded by the Minjiang, Huya, and Taz...

    Authors: Zhaosheng Nie, Di-Jin Wang, Zhige Jia, Pengfei Yu and Liangfa Li

    Citation: Earth, Planets and Space 2018 70:55

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  19. Content type: Full paper

    Spatial and temporal variations in inland crustal stress prior to the 2011 Mw 9.0 Tohoku earthquake are investigated using focal mechanism solutions for shallow seismicity in Iwaki City, Japan. The multiple in...

    Authors: Makoto Otsubo, Ayumu Miyakawa and Kazutoshi Imanishi

    Citation: Earth, Planets and Space 2018 70:51

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  20. Content type: Full paper

    The southeast offshore Mie earthquake occurred on April 1, 2016 near the rupture area of the 1944 Tonankai earthquake, where seismicity around the interface of the Philippine Sea plate had been very low until ...

    Authors: Shunsuke Takemura, Takeshi Kimura, Tatsuhiko Saito, Hisahiko Kubo and Katsuhiko Shiomi

    Citation: Earth, Planets and Space 2018 70:50

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  21. Content type: Express Letter

    Magnetotelluric data analyses and three-dimensional modeling techniques were implemented to investigate the crustal electrical structure in the North-Central Turkey, along a 190-km-long profile crossing Çankır...

    Authors: Sinan Özaydın, Sabri Bülent Tank and Mustafa Karaş

    Citation: Earth, Planets and Space 2018 70:49

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  22. Content type: Express Letter

    The vertical downward component of the DC atmospheric electric field, or potential gradient (PG), at Kakioka 150 km southwest of the Fukushima Dai-ichi Nuclear Power Plant (FNPP1) was analyzed before and after...

    Authors: Masatoshi Yamauchi, Masahiko Takeda and Shingo Nagamachi

    Citation: Earth, Planets and Space 2018 70:48

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  23. Content type: Frontier letter

    A hot and acid crater lake is located in the Nakadake crater, Aso volcano, Japan. The volume of water in the lake decreases with increasing activity, drying out prior to the magmatic eruptions. Salt-rich mater...

    Authors: Hiroshi Shinohara, Nobuo Geshi, Akihiko Yokoo, Takahiro Ohkura and Akihiko Terada

    Citation: Earth, Planets and Space 2018 70:46

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  24. Content type: Full paper

    We studied ionospheric irregularities caused by midlatitude sporadic-E (Es) in Japan using ionospheric total electron content (TEC) data from a dense GNSS array, GEONET, with a 3D (three-dimensional) tomography t...

    Authors: Ihsan Naufal Muafiry, Kosuke Heki and Jun Maeda

    Citation: Earth, Planets and Space 2018 70:45

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  25. Content type: Full paper

    Geomagnetic excursions during Brunhes epoch have been brought to the forefront topic in paleomagnetic study, as they provide key information about Earth’s interior dynamics and could serve as another tool for ...

    Authors: Guanhua Li, Dunsheng Xia, Erwin Appel, Youjun Wang, Jia Jia and Xiaoqiang Yang

    Citation: Earth, Planets and Space 2018 70:44

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  26. Content type: Full paper

    The fluxgate magnetometer for the Arase (ERG) spacecraft mission was built to investigate particle acceleration processes in the inner magnetosphere. Precise measurements of the field intensity and direction a...

    Authors: Ayako Matsuoka, Mariko Teramoto, Reiko Nomura, Masahito Nosé, Akiko Fujimoto, Yoshimasa Tanaka, Manabu Shinohara, Tsutomu Nagatsuma, Kazuo Shiokawa, Yuki Obana, Yoshizumi Miyoshi, Makoto Mita, Takeshi Takashima and Iku Shinohara

    Citation: Earth, Planets and Space 2018 70:43

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  27. Content type: Full paper

    The Gravity Recovery and Climate Experiment (GRACE) satellite mission measures the combined gravity signal of several overlapping processes. A common approach to separate the hydrological signal in previous ic...

    Authors: Tanghua Li, Patrick Wu, Hansheng Wang, Lulu Jia and Holger Steffen

    Citation: Earth, Planets and Space 2018 70:41

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  28. Content type: Full paper

    Combining analyses of spatial and temporal characteristics of the ionosphere is of great significance for scientific research and engineering applications. Tensor decomposition is performed to explore the temp...

    Authors: Shikun Lu, Hao Zhang, Xihai Li, Yihong Li, Chao Niu, Xiaoyun Yang and Daizhi Liu

    Citation: Earth, Planets and Space 2018 70:39

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  29. Content type: Full paper

    Belonging to the Cameroon Volcanic Line (CVL), the western part of Cameroon is an active volcanic zone with volcanic eruptions and deadly gas emissions. The volcanic flows generally cover areas and bury struct...

    Authors: Jean Marcel, Jean Marcel Abate Essi, Philippe Njandjock Nouck, Oumarou Sanda and Eliézer Manguelle-Dicoum

    Citation: Earth, Planets and Space 2018 70:42

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  30. Content type: Express Letter

    We measured the abundances of Sr and rare earth elements (REEs) in the matrices of five CV3 carbonaceous chondrites: Meteorite Hills (MET) 00430, MET 01070, La Paz ice field (LAP) 02206, Asuka (A) 881317 and R...

    Authors: Kaori Jogo, Motoo Ito, Tomoki Nakamura, Sachio Kobayashi and Jong Ik Lee

    Citation: Earth, Planets and Space 2018 70:37

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  31. Content type: Technical report

    We report a brief survey on conditions for artificial aurora optical experiments in F region heating with O-mode at the EISCAT Tromsø site using dynasonde data from 2000 to 2017. The results obtained in our surve...

    Authors: T. T. Tsuda, M. T. Rietveld, M. J. Kosch, S. Oyama, K. Hosokawa, S. Nozawa, T. Kawabata, A. Mizuno and Y. Ogawa

    Citation: Earth, Planets and Space 2018 70:40

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  32. Content type: Full paper

    Understanding variations of slip distance along major thrust systems at convergent margins is an important issue for evaluation of near-trench slip and the potential generation of large tsunamis. We derived qu...

    Authors: Hideki Mukoyoshi, Shunya Kaneki and Tetsuro Hirono

    Citation: Earth, Planets and Space 2018 70:36

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  33. Content type: Express Letter

    Geomagnetic field data obtained through the INTERMAGNET program are convolved with with magnetotelluric surface impedance from four EarthScope USArray sites to estimate the geoelectric variations throughout th...

    Authors: Stephen W. Cuttler, Jeffrey J. Love and Andrei Swidinsky

    Citation: Earth, Planets and Space 2018 70:35

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  34. Content type: Express Letter

    The basic theory for reconstruction of two-dimensional, coherent, magnetohydrostatic structures with nonisotropic plasma pressure is developed. Three field-line invariants are found in the system. A new Poisso...

    Authors: Wai-Leong Teh

    Citation: Earth, Planets and Space 2018 70:34

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    The Correction to this article has been published in Earth, Planets and Space 2018 70:185

  35. Content type: Full paper

    The Atotsugawa fault system is one of the best-known active faults in Japan. However, revealing the interseismic velocity field in and around the Atotsugawa fault system with high spatial resolution is challen...

    Authors: Youichiro Takada, Takeshi Sagiya and Takuya Nishimura

    Citation: Earth, Planets and Space 2018 70:32

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  36. Content type: Full paper

    Seismic attenuation properties were tested as indicators of lateral variation in geological structures and detection of faults within poorly reflective oceanic crust, on a seismic survey line along the Nankai ...

    Authors: Tetsuro Tsuru, Jin-Oh Park, Tetsuo No, Yukari Kido and Kazuo Nakahigashi

    Citation: Earth, Planets and Space 2018 70:31

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  37. Content type: Full paper

    CHAMP satellite and relatively densely spaced ground-based data measured over southern Africa between 2005 and 2010 are combined in a new regional, harmonic spline based, core field model. This new SACFM-2 mod...

    Authors: Emmanuel Nahayo, Pieter B. Kotzé, Monika Korte and Susan J. Webb

    Citation: Earth, Planets and Space 2018 70:30

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  38. Content type: Full paper

    We present a new tool for modelling time-lapse magnetotelluric (MT) data, an emerging technique for monitoring changes in subsurface electrical resistivity. Time-lapse MT data have been acquired in various set...

    Authors: Dennis Conway, Graham Heinson, Nigel Rees and Joseph Rugari

    Citation: Earth, Planets and Space 2018 70:27

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  39. Content type: Express Letter

    The water in Earth’s mantle is closely related with plate subduction and volcanism. Recent studies revealed that the mantle wedge corner at approximately 30 km depth holds high-pressure water, where many slow ...

    Authors: Yoshiyuki Tanaka, Takehito Suzuki, Yuichi Imanishi, Shuhei Okubo, Xinlin Zhang, Miwako Ando, Atsushi Watanabe, Mamoru Saka, Chiaki Kato, Shuichi Oomori and Yoshifumi Hiraoka

    Citation: Earth, Planets and Space 2018 70:25

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  40. Content type: Full paper

    Since insertion into orbit on December 7, 2015, the Akatsuki orbiter has returned global images of Venus from its four imaging cameras at eleven discrete wavelengths from ultraviolet (283 and 365 nm) and near ...

    Authors: Sanjay S. Limaye, Shigeto Watanabe, Atsushi Yamazaki, Manabu Yamada, Takehiko Satoh, Takao M. Sato, Masato Nakamura, Makoto Taguchi, Tetsuya Fukuhara, Takeshi Imamura, Toru Kouyama, Yeon Joo Lee, Takeshi Horinouchi, Javier Peralta, Naomoto Iwagami, George L. Hashimoto…

    Citation: Earth, Planets and Space 2018 70:24

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