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  1. 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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  2. 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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  3. 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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  4. 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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  5. 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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  6. 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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  7. 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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  8. 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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  9. 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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  10. 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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  11. 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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  12. 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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  13. 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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  14. 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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  15. 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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  16. 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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  17. 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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  18. 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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  19. 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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  20. 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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  21. 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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  22. 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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  23. 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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  24. 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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  25. 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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  26. 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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  27. 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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  28. 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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  29. 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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  30. 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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  31. 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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  32. 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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  33. 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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  34. 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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  35. 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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  36. 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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  37. 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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  38. 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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