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  1. Content type: Technical report

    One of the representative auroral emission lines that radiates from F-region heights and is measurable on the ground is the 777.4 nm line from excited atomic oxygen. This line has been adopted, along with anot...

    Authors: Shin-ichiro Oyama, Takuo T. Tsuda, Keisuke Hosokawa, Yasunobu Ogawa, Yoshizumi Miyoshi, Satoshi Kurita, Antti E. Kero, Ryoichi Fujii, Yoshimasa Tanaka, Akira Mizuno, Tetsuya Kawabata, Björn Gustavsson and Thomas Leyser

    Citation: Earth, Planets and Space 2018 70:166

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  2. Content type: Express Letter

    Hydrogenetic ferromanganese crusts (hereafter referred to as “crusts”) on Pacific seamounts are formed by the precipitation of iron–manganese oxides from seawater on volcanic and biogenic substrate rocks. As c...

    Authors: Hirokuni Oda, Yoshio Nakasato and Akira Usui

    Citation: Earth, Planets and Space 2018 70:165

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  3. Content type: Frontier letter

    High-latitude, small-scale plasma density irregularities are observed by the Advanced Land Observation Satellite 2, Phase Array type L-band Synthetic Aperture Radar-2 and the European Incoherent Scatter radar ...

    Authors: Hiroatsu Sato, Jun Su Kim, Norbert Jakowski and Ingemar Häggström

    Citation: Earth, Planets and Space 2018 70:163

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  4. Content type: Full paper

    On June 11, 2015, a train of large-amplitude Kelvin–Helmholtz (KH) billows was monitored by the Middle and Upper Atmosphere (MU) radar (Shigaraki MU Observatory, Japan) at the altitude of ~ 6.5 km. Four to fiv...

    Authors: Hubert Luce, Lakshmi Kantha, Masanori Yabuki and Hiroyuki Hashiguchi

    Citation: Earth, Planets and Space 2018 70:162

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  5. Content type: Full paper

    The St. Patrick’s Day geomagnetic storm on March 17, 2015, has been chosen by the space community for synergetic analysis to build a more comprehensive picture of the storm’s origin and evolution. This storm h...

    Authors: Olga V. Kozyreva, Vyacheslav A. Pilipenko, Vladimir B. Belakhovsky and Yaroslav A. Sakharov

    Citation: Earth, Planets and Space 2018 70:157

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  6. Content type: Full paper

    The northeastern Turkey is located at the intensely deformed east Anatolian Collision Zone that is formed by the collision of the Arabian Plate with Eurasia. The region is one of the best examples of the conti...

    Authors: Özlem Hacıoğlu, Ahmet Tuğrul Başokur and Elif Tolak Çiftçi

    Citation: Earth, Planets and Space 2018 70:161

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  7. Content type: Full paper

    Typical eruptions of Taal Volcano in the Philippines are frequent and violently explosive. The last devastating phreatomagmatic eruption from 1965 to 1977 resulted in the death of about 200 persons. For this a...

    Authors: Jacques Zlotnicki, Y. Sasai, M. J. S. Johnston, F. Fauquet, E. Villacorte and J. M. Cordon Jr.

    Citation: Earth, Planets and Space 2018 70:159

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  8. Content type: Full paper

    Previous studies have compiled relative paleointensity data for the last 2–3 Ma from individual paleomagnetic records obtained from marine sediment cores. These records have mostly been obtained by pass-throug...

    Authors: Yuhji Yamamoto, Toshitsugu Yamazaki and Toshiya Kanamatsu

    Citation: Earth, Planets and Space 2018 70:160

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  9. Content type: Full paper

    The effects of the short-wavelength heterogeneity of the crustal structure on predicted ground motion at periods of 1 s and longer were investigated by conducting three-dimensional finite-difference simulation...

    Authors: Asako Iwaki, Takahiro Maeda, Nobuyuki Morikawa, Shunsuke Takemura and Hiroyuki Fujiwara

    Citation: Earth, Planets and Space 2018 70:156

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  10. Content type: Full paper

    Magnetic mineral inclusions in silicates are widespread in sediments as well as in igneous rocks. Because they are isolated from surrounding environment, they have potential to preserve original magnetic signa...

    Authors: Yoichi Usui, Takaya Shimono and Toshitsugu Yamazaki

    Citation: Earth, Planets and Space 2018 70:153

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  11. Content type: Full paper

    Volcanic gas composition measurement by Multi-GAS was repeated during the eruptive period in 2014–2015 as well as the quiet period preceding the eruption at Nakadake crater, Aso volcano. The eruptive activity ...

    Authors: Hiroshi Shinohara, Akihiko Yokoo and Ryunosuke Kazahaya

    Citation: Earth, Planets and Space 2018 70:151

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  12. Content type: Express Letter

    Global navigation satellite system data from Hakone volcano, central Japan, together with GEONET data from the Geospatial Information Authority of Japan, were used to investigate the processes associated with ...

    Authors: Masatake Harada, Ryosuke Doke, Kazutaka Mannen, Kazuhiro Itadera and Mikio Satomura

    Citation: Earth, Planets and Space 2018 70:152

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  13. Content type: Express Letter

    We conducted high-resolution reflection analysis of data from 168 seismic stations with an average spacing of about 5 km, in northern Kinki district, southwestern Japan. Reflection analysis has previously been...

    Authors: Shinya Katoh, Yoshihisa Iio, Hiroshi Katao, Masayo Sawada, Kazuhide Tomisaka, Tsutomu Miura and Itaru Yoneda

    Citation: Earth, Planets and Space 2018 70:149

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  14. Content type: Technical report

    There are growing demands for integrated study of isotopes, trace elements and crystallography of micron-sized grains observed on polished sections or scattered on surface of sample holders. However, transmiss...

    Authors: Yuchen Xu, Lixin Gu, Yang Li, Bing Mo and Yangting Lin

    Citation: Earth, Planets and Space 2018 70:150

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  15. Content type: Full paper

    Analysis of 163 isolated substorms showed that their intensity quantified as a maximum absolute value of the AL index increases with an increase in the velocity and number density of the solar wind plasma and ...

    Authors: Vyacheslav Georgievich Vorobjev, Elizaveta Evgenievna Antonova and Oksana Ivanovna Yagodkina

    Citation: Earth, Planets and Space 2018 70:148

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  16. Content type: Express Letter

    We discovered a secular change in the travel time of direct S-waves over a 10-year observation period by means of continuous operation of an artificial and stable seismic source, called Accurately Controlled R...

    Authors: Shuhei Tsuji, Koshun Yamaoka, Ryoya Ikuta, Takahiro Kunitomo, Toshiki Watanabe, Yasuhiro Yoshida and Akio Katsumata

    Citation: Earth, Planets and Space 2018 70:146

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  17. Content type: Full paper

    The geomagnetic field is comprised of drifting and standing fields. The drifting field has two remarkable features. One is predominance of sectorial harmonics when the field is expressed in a spherical harmoni...

    Authors: Takesi Yukutake and Hisayoshi Shimizu

    Citation: Earth, Planets and Space 2018 70:145

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  18. Content type: Full paper

    We performed a simultaneous survey of self-potential and plume turbidity using an autonomous underwater vehicle (AUV) above the Sunrise deposit in the Myojin Knoll caldera of the Izu-Ogasawara arc. A 10-m-long...

    Authors: Yoshifumi Kawada and Takafumi Kasaya

    Citation: Earth, Planets and Space 2018 70:142

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  19. Content type: Full paper

    The most recent and largest caldera-forming eruption occurred at ~ 90 ka at Aso Volcano, SW Japan, and is known as the “Aso-4 eruption.” We performed chemical analyses of amphibole phenocrysts from Aso-4 pyroc...

    Authors: Hidemi Ishibashi, Yukiko Suwa, Masaya Miyoshi, Atsushi Yasuda and Natsumi Hokanishi

    Citation: Earth, Planets and Space 2018 70:137

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  20. Content type: Express Letter

    During the last magmatic eruption period of Aso volcano (November 2014 to May 2015), a controlled-source electromagnetic volcano monitoring experiment (ACTIVE) was conducted. Here, we interpret the temporal va...

    Authors: Takuto Minami, Mitsuru Utsugi, Hisashi Utada, Tsuneomi Kagiyama and Hiroyuki Inoue

    Citation: Earth, Planets and Space 2018 70:138

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  21. Content type: Full paper

    The characteristic features of the quarterdiurnal tide (QDT) in the mesosphere and lower thermosphere (MLT) are investigated using meteor radar observations from three low-latitude southern hemispheric station...

    Authors: Amitava Guharay, Paulo Prado Batista, Ricardo Arlen Buriti and Nelson Jorge Schuch

    Citation: Earth, Planets and Space 2018 70:140

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  22. Content type: Full paper

    In contrast to surface observation of complex earthquake faults, simple fault-plane models are frequently sufficient to fit geophysical data of seismic wave or crustal deformation. However, earthquake occurren...

    Authors: Yuta Mitsui

    Citation: Earth, Planets and Space 2018 70:136

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  23. Content type: Full paper

    The definitive existence of a giant impact crater, two times larger than the Chixulub crater in the Yucatan peninsula, from an extraterrestrial origin, 1.6 km beneath Wilkes Land, East Antarctica, remain contr...

    Authors: Jaroslav Klokočník, Jan Kostelecký and Aleš Bezděk

    Citation: Earth, Planets and Space 2018 70:135

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  24. Content type: Full paper

    The extremely high-energy electron experiment (XEP) onboard the Arase (ERG) satellite is designed to measure high-energy electrons in the Earth’s radiation belts. The XEP was developed by taking advantage of o...

    Authors: Nana Higashio, Takeshi Takashima, Iku Shinohara and Haruhisa Matsumoto

    Citation: Earth, Planets and Space 2018 70:134

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  25. Content type: Full paper

    Invariants under rotation of the magnetotelluric impedance tensor relax the directional requirements when fitting data using two-dimensional (2D) models. This happens, for instance, when using the familiar imp...

    Authors: Enrique Gómez-Treviño, Yunuhen Muñiz, Mayra Cuellar and Armando Calderón-Moctezuma

    Citation: Earth, Planets and Space 2018 70:133

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  26. Content type: Full paper

    The European Space Agency’s three-satellite constellation Swarm, launched in November 2013, has provided unprecedented monitoring of Earth’s magnetic field via a unique set of gradiometric and multi-satellite mea...

    Authors: Terence J. Sabaka, Lars Tøffner-Clausen, Nils Olsen and Christopher C. Finlay

    Citation: Earth, Planets and Space 2018 70:130

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  27. Content type: Full paper

    We have analyzed the role of auroral processes in the formation of the outer radiation belt, considering that the main part of the auroral oval maps to the outer part of the ring current, instead of the plasma...

    Authors: Elizaveta E. Antonova, Marina V. Stepanova, Pablo S. Moya, Victor A. Pinto, Vadim V. Vovchenko, Ilya L. Ovchinnikov and Nikita V. Sotnikov

    Citation: Earth, Planets and Space 2018 70:127

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  28. Content type: Full paper

    Optical auroral measurements repeatedly reveal the existence of a transitional stage between a quiescent preexisting arc and its significant auroral expansion in a substorm onset. Such a transitional stage of ...

    Authors: Jun Liang, Eric Donovan, Deborah Gillies, Emma Spanswick and Martin Connors

    Citation: Earth, Planets and Space 2018 70:126

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  29. Content type: Full paper

    Volcanic tremor is often observed to be associated with an increase in volcanic activity and during periods approaching eruptions. It is therefore of crucial importance to study this phenomenon. The opening of...

    Authors: Misa Ichimura, Akihiko Yokoo, Tsuneomi Kagiyama, Shin Yoshikawa and Hiroyuki Inoue

    Citation: Earth, Planets and Space 2018 70:125

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  30. Content type: Preface

    Recent advances in the field of atmospheric and ionospheric sensing by GNSS and SAR technologies were discussed during two workshops held in February 2016 and October 2016 in Italy, hosted by GEOlab of Politec...

    Authors: Toshitaka Tsuda, Eugenio Realini, Yoshinori Shoji, Akinori Saito, Masanori Yabuki and Masato Furuya

    Citation: Earth, Planets and Space 2018 70:123

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  31. Content type: Full paper

    Seismic refraction and multi-channel seismic reflection surveys were conducted on the northeastern Hawaiian Arch to examine the effect of hotspot volcanism on the seismic structure of the crust and uppermost m...

    Authors: Akane Ohira, Shuichi Kodaira, Gregory F. Moore, Mikiya Yamashita, Toshiya Fujiwara, Yuka Kaiho, Seiichi Miura and Gou Fujie

    Citation: Earth, Planets and Space 2018 70:121

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  32. Content type: Full paper

    Horizontal crustal strain in the Tohoku area during the twentieth century based on triangulation showed N–S extension and E–W contraction was not significant. This feature was one of the reasons why the 2011 T...

    Authors: Takeshi Sagiya, Nobuhisa Matta and Yusaku Ohta

    Citation: Earth, Planets and Space 2018 70:120

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  33. Content type: Full paper

    The real-time estimation of polar motion (PM) is needed for the navigation of Earth satellite and interplanetary spacecraft. However, it is impossible to have real-time information due to the complexity of the...

    Authors: Sadegh Modiri, Santiago Belda, Robert Heinkelmann, Mostafa Hoseini, José M. Ferrándiz and Harald Schuh

    Citation: Earth, Planets and Space 2018 70:115

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  34. Content type: Full paper

    The global dynamics of substorms are controlled by several key magnetospheric parameters. In this work we obtain quantitative measures of these parameters from a low-order nonlinear model of the nightside magn...

    Authors: Edmund Spencer, Sai Krishna Vadepu, Pavithra Srinivas, Swadesh Patra and Wendell Horton

    Citation: Earth, Planets and Space 2018 70:118

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