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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: 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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  3. 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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  4. 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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  5. 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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  6. 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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  7. 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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  8. 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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  9. 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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  10. 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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  11. 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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  12. 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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  13. 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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  14. 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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  15. 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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  16. 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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  17. 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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  18. 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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  19. 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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  20. 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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