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  1. Content type: Full paper

    The 2015 unrest of the Hakone volcano in Japan, which began on April 26, generated earthquake swarms accompanied by long-term deformation. The earthquake swarm activity reached its maximum in mid-May and gradu...

    Authors: Ryou Honda, Yohei Yukutake, Yuichi Morita, Shin’ichi Sakai, Kazuhiro Itadera and Kazuya Kokubo

    Citation: Earth, Planets and Space 2018 70:117

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  2. Content type: Full paper

    In order to investigate the seismic velocity structure in the region of concentrated severe damage during the 2016 Kumamoto earthquake sequence, we conducted continuous seismic observations in the central area...

    Authors: Takumi Hayashida, Masumi Yamada, Masayuki Yamada, Koji Hada, Jim Mori, Yoshinori Fujino, Hiromu Sakaue, Sosuke Fukatsu, Eiko Nishihara, Toru Ouchi and Akio Fujii

    Citation: Earth, Planets and Space 2018 70:116

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  3. Content type: Full paper

    In association with the September 2014 phreatic eruption (VEI 1–2) at Ontake Volcano, a syn-eruptive and two post-eruptive lahars occurred in the Akagawa–Nigorigawa River, southern flank of the volcano. The pr...

    Authors: Kyoko S. Kataoka, Takane Matsumoto, Takeshi Saito, Katsuhisa Kawashima, Yoshitaka Nagahashi, Tsutomu Iyobe, Akihiko Sasaki and Keisuke Suzuki

    Citation: Earth, Planets and Space 2018 70:113

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  4. Content type: Full paper

    Based on experimental observations with EISCAT VHF radar during the summer period, July 8–12, 2013, the observations of polar mesosphere summer echoes (PMSE) in the absence of particle precipitation indicate t...

    Authors: Abdur Rauf, Hailong Li, Safi Ullah, Lin Meng, Bin Wang and Maoyan Wang

    Citation: Earth, Planets and Space 2018 70:108

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  5. Content type: Full paper

    Polar mesosphere winter echoes (PMWE) were observed at 70 km over Tromsø, Norway, on 8 January 2014 using the tristatic configuration of the European incoherent scatter VHF radar. For the interval 11:00–13:00 ...

    Authors: Evgenia Belova, Maria Kawnine, Ingemar Häggström, Tima Sergienko, Sheila Kirkwood and Anders Tjulin

    Citation: Earth, Planets and Space 2018 70:110

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  6. Content type: Full paper

    The Chinese BeiDou Navigation Satellite System has shown potential for precise positioning with a comparable accuracy to that of the Global Positioning System (GPS) at the centimeter level for the horizontal c...

    Authors: Kemin Zhu, Lei Zhao, Wei Wang, Shoujian Zhang, Renli Liu and Jinling Wang

    Citation: Earth, Planets and Space 2018 70:112

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  7. Content type: Express Letter

    We herein estimated the end of the ongoing deflation at Sinabung volcano, Indonesia, which began in 2014 under the assumption that the magma is incompressible and behaves as a Bingham fluid. At first, we estim...

    Authors: Kohei Hotta, Masato Iguchi, Takahiro Ohkura, Muhamad Hendrasto, Hendra Gunawan, Umar Rosadi and Estu Kriswati

    Citation: Earth, Planets and Space 2018 70:107

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  8. Content type: Express Letter

    We have developed a new magnetometer system specialized to multipoint and long-term observations on the seafloor to promote marine or ocean-bottom experiments mainly for the electromagnetic sounding of the Ear...

    Authors: Kazunori Ogawa, Tetsuo Matsuno, Hiroshi Ichihara, Kazuo Nakahigashi and Nobukazu Seama

    Citation: Earth, Planets and Space 2018 70:111

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  9. Content type: Frontier letter

    The uppermost structures of incoming oceanic plates have been investigated by seismic exploration surveys, primarily based on two-dimensional profiles. However, their regional-scale lateral variations and shea...

    Authors: Takashi Tonegawa, Koichiro Obana, Gou Fujie and Shuichi Kodaira

    Citation: Earth, Planets and Space 2018 70:106

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  10. Content type: Frontier letter

    A simple and rapid technique to effectively remove volcanic smoke (vapor-dominated white plume) from visible or thermal infrared images of active craters is proposed, in which multiple photographs taken in a f...

    Authors: Takeshi Hashimoto, Akihiko Terada and Ryo Tanaka

    Citation: Earth, Planets and Space 2018 70:109

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  11. Content type: Full paper

    In this work, we investigate the Brazilian low-latitude ionospheric response to two corotating interaction regions (CIRs) and high-speed streams (HSSs) events during the solar minimum of solar cycle 23, in 20...

    Authors: Claudia M. N. Candido, Inez S. Batista, Virginia Klausner, Patricia M. de Siqueira Negreti, Fabio Becker-Guedes, Eurico R. de Paula, Jiankui Shi and Emilia S. Correia

    Citation: Earth, Planets and Space 2018 70:104

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  12. Content type: Express Letter

    An explosive eruption occurred at the Naka-dake first crater of Aso volcano at 1:46 on October 8, 2016 (JST). According to the field survey conducted by Kumamoto University, Kyoto University, the National Inst...

    Authors: Eiichi Sato, Keiichi Fukui and Toshiki Shimbori

    Citation: Earth, Planets and Space 2018 70:105

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  13. Content type: Full paper

    The Exploration of energization and Radiation in Geospace (ERG) project explores the acceleration, transport, and loss of relativistic electrons in the radiation belts and the dynamics for geospace storms. Thi...

    Authors: Yoshizumi Miyoshi, Iku Shinohara, Takeshi Takashima, Kazushi Asamura, Nana Higashio, Takefumi Mitani, Satoshi Kasahara, Shoichiro Yokota, Yoichi Kazama, Shiang-Yu Wang, Sunny W. Y. Tam, Paul T. P. Ho, Yoshiya Kasahara, Yasumasa Kasaba, Satoshi Yagitani, Ayako Matsuoka…

    Citation: Earth, Planets and Space 2018 70:101

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  14. Content type: Full paper

    The exploration of energization and radiation in geospace (ERG) satellite, nicknamed “Arase,” is the second satellite in a series of small scientific satellites created by the Institute of Space and Astronauti...

    Authors: Yosuke Nakamura, Seisuke Fukuda, Yasuko Shibano, Hiroyuki Ogawa, Shin-ichiro Sakai, Shigehito Shimizu, Ersin Soken, Yu Miyazawa, Hiroyuki Toyota, Akio Kukita, Yusuke Maru, Junichi Nakatsuka, Tomohiko Sakai, Shinsuke Takeuchi, Kenichiro Maki, Makoto Mita…

    Citation: Earth, Planets and Space 2018 70:102

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  15. Content type: Full paper

    In this research, a new numerical method, called the hybrid finite difference–finite element (hybrid FD–FE) method, is developed to solve 2-D magnetotelluric modeling by taking advantage of both the finite dif...

    Authors: Weerachai Sarakorn and Chatchai Vachiratienchai

    Citation: Earth, Planets and Space 2018 70:103

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  16. Content type: Full paper

    Many models describing the Earth’s magnetic field exist and are maintained by international research organizations. However, no clear general overview of the cross-compared quality of these models is available...

    Authors: Jean-François Oehler, Didier Rouxel and Marie-Françoise Lequentrec-Lalancette

    Citation: Earth, Planets and Space 2018 70:99

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  17. Content type: Full paper

    The data provided by ten DONET deep-sea observatories, that on March 11, 2011, registered the Great East Japan Earthquake and tsunami, were used for investigation of the relationship between variations of the ...

    Authors: Mikhail Nosov, Viacheslav Karpov, Sergey Kolesov, Kirill Sementsov, Hiroyuki Matsumoto and Yoshiyuki Kaneda

    Citation: Earth, Planets and Space 2018 70:100

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  18. Content type: Express Letter

    Seismic wave propagation from shallow subduction-zone earthquakes can be strongly affected by 3D heterogeneous structures, such as oceanic water and sedimentary layers with irregular thicknesses. Synthetic wav...

    Authors: Taro Okamoto, Hiroshi Takenaka and Takeshi Nakamura

    Citation: Earth, Planets and Space 2018 70:98

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  19. Content type: Technical report

    The Exploration of energization and Radiation in Geospace (ERG) Science Center serves as a hub of the ERG project, providing data files in a common format and developing the space physics environment data anal...

    Authors: Yoshizumi Miyoshi, Tomoaki Hori, Masafumi Shoji, Mariko Teramoto, T. F. Chang, Tomonori Segawa, Norio Umemura, Shoya Matsuda, Satoshi Kurita, Kunihiro Keika, Yukinaga Miyashita, Kanako Seki, Yoshimasa Tanaka, Nozomu Nishitani, Satoshi Kasahara, Shoichiro Yokota…

    Citation: Earth, Planets and Space 2018 70:96

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  20. Content type: Full paper

    In recent years, numerical weather models have shown the potential to provide a good representation of the electrically neutral atmosphere. This fact has been exploited for the modeling of space geodetic obser...

    Authors: Thalia Nikolaidou, Kyriakos Balidakis, Felipe Nievinski, Marcelo Santos and Harald Schuh

    Citation: Earth, Planets and Space 2018 70:95

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  21. Content type: Technical report

    We report a brief survey of matching conditions for artificial aurora optical experiments utilizing the second electron gyro-harmonic (2.7-MHz frequency) in F region heating with O-mode at the EISCAT Tromsø site ...

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

    Citation: Earth, Planets and Space 2018 70:94

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  22. Content type: Full paper

    Because the maximum temperature reached in the slip zone is significant information for understanding slip behaviors during an earthquake, the maturity of carbonaceous material (CM) is widely used as a proxy f...

    Authors: Shunya Kaneki and Tetsuro Hirono

    Citation: Earth, Planets and Space 2018 70:92

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  23. Content type: Full paper

    A satellite placed in space is constantly affected by the space environment, resulting in various impacts from temporary faults to permanent failures depending on factors such as satellite orbit, solar and geo...

    Authors: Nizam Ahmad, Dhani Herdiwijaya, Thomas Djamaluddin, Hideyuki Usui and Yohei Miyake

    Citation: Earth, Planets and Space 2018 70:91

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  24. Content type: Full paper

    The existence of lightning discharges in the Venus atmosphere has been controversial for more than 30 years, with many positive and negative reports published. The lightning and airglow camera (LAC) onboard th...

    Authors: Yukihiro Takahashi, Mitsuteru Sato, Masataka Imai, Ralph Lorenz, Yoav Yair, Karen Aplin, Georg Fischer, Masato Nakamura, Nobuaki Ishii, Takumi Abe, Takehiko Satoh, Takeshi Imamura, Chikako Hirose, Makoto Suzuki, George L. Hashimoto, Naru Hirata…

    Citation: Earth, Planets and Space 2018 70:88

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  25. Content type: Express Letter

    Volcanic activity involves processes that can change over short periods of time, which are sometimes closely related to the eruptive mode or the timing of its transitions. Eruptions bring high-temperature magm...

    Authors: Takayuki Kaneko, Kenji Takasaki, Fukashi Maeno, Martin J. Wooster and Atsushi Yasuda

    Citation: Earth, Planets and Space 2018 70:89

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  26. Content type: Full paper

    We compare hourly averaged neutral winds derived from two meteor radars operating at 33.2 and 55 MHz to estimate the errors in these measurements. We then compare the meteor radar winds with those from a mediu...

    Authors: Iain M. Reid, Daniel L. McIntosh, Damian J. Murphy and Robert A. Vincent

    Citation: Earth, Planets and Space 2018 70:84

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  27. Content type: Full paper

    The Exploration of energization and Radiation in Geospace (ERG) project aims to study acceleration and loss mechanisms of relativistic electrons around the Earth. The Arase (ERG) satellite was launched on Dece...

    Authors: Yoshiya Kasahara, Yasumasa Kasaba, Hirotsugu Kojima, Satoshi Yagitani, Keigo Ishisaka, Atsushi Kumamoto, Fuminori Tsuchiya, Mitsunori Ozaki, Shoya Matsuda, Tomohiko Imachi, Yoshizumi Miyoshi, Mitsuru Hikishima, Yuto Katoh, Mamoru Ota, Masafumi Shoji, Ayako Matsuoka…

    Citation: Earth, Planets and Space 2018 70:86

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  28. Content type: Full paper

    In this study, we evaluate the El Niño–Southern Oscillation (ENSO) signals in the two dominant temperature diurnal tides, diurnal westward wavenumber 1 (DW1) and diurnal eastward wavenumber 3 (DE3) on the quas...

    Authors: Yang-Yi Sun, Huixin Liu, Yasunobu Miyoshi, Libo Liu and Loren C. Chang

    Citation: Earth, Planets and Space 2018 70:85

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  29. Content type: Full paper

    The High Frequency Analyzer (HFA) is a subsystem of the Plasma Wave Experiment onboard the Arase (ERG) spacecraft. The main purposes of the HFA include (1) determining the electron number density around the sp...

    Authors: Atsushi Kumamoto, Fuminori Tsuchiya, Yoshiya Kasahara, Yasumasa Kasaba, Hirotsugu Kojima, Satoshi Yagitani, Keigo Ishisaka, Tomohiko Imachi, Mitsunori Ozaki, Shoya Matsuda, Masafumi Shoji, Aayako Matsuoka, Yuto Katoh, Yoshizumi Miyoshi and Takahiro Obara

    Citation: Earth, Planets and Space 2018 70:82

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  30. Content type: Full paper

    Bright auroral emissions during geomagnetic storms provide a good opportunity for testing the proposal that substorm onset is frequently triggered by plasma sheet flow bursts that are manifested in the ionosph...

    Authors: Larry R. Lyons, Ying Zou, Yukitoshi Nishimura, Bea Gallardo-Lacourt, Vassilis Angelopulos and Eric F. Donovan

    Citation: Earth, Planets and Space 2018 70:81

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  31. Content type: Full paper

    The software-type wave–particle interaction analyzer (S-WPIA) is an instrument package onboard the Arase satellite, which studies the magnetosphere. The S-WPIA represents a new method for directly observing wa...

    Authors: Mitsuru Hikishima, Hirotsugu Kojima, Yuto Katoh, Yoshiya Kasahara, Satoshi Kasahara, Takefumi Mitani, Nana Higashio, Ayako Matsuoka, Yoshizumi Miyoshi, Kazushi Asamura, Takeshi Takashima, Shoichiro Yokota, Masahiro Kitahara and Shoya Matsuda

    Citation: Earth, Planets and Space 2018 70:80

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  32. Content type: Full paper

    Paleomagnetic information reconstructed from archeological materials can be utilized to estimate the archeological age of excavated relics, in addition to revealing the geomagnetic secular variation and core d...

    Authors: Yu Kitahara, Yuhji Yamamoto, Masao Ohno, Yoshihiro Kuwahara, Shuichi Kameda and Tadahiro Hatakeyama

    Citation: Earth, Planets and Space 2018 70:79

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  33. Content type: Full paper

    Paleomagnetic and rock magnetic investigations were performed on a 64-cm-thick section of nonmarine unconsolidated muddy sediment from the Gosan Formation on Jeju Island, Korea. This sediment was recently date...

    Authors: Hyeon-Seon Ahn, Young Kwan Sohn, Jin-Young Lee and Jin Cheul Kim

    Citation: Earth, Planets and Space 2018 70:78

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  34. Content type: Full paper

    This paper reports the design, calibration, and operation of high-energy electron experiments (HEP) aboard the exploration of energization and radiation in geospace (ERG) satellite. HEP detects 70 keV–2 MeV el...

    Authors: Takefumi Mitani, Takeshi Takashima, Satoshi Kasahara, Wataru Miyake and Masafumi Hirahara

    Citation: Earth, Planets and Space 2018 70:77

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  35. 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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  36. 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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  37. 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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  38. 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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  39. 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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  40. 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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  41. 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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  42. 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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