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  1. Content type: Express Letter

    At many volcano observatories, measurements of the plume height are frequently applied. On the other hand, the recent development of the satellite measurements enables the monitoring of the SO2 mass emitted by th...

    Authors: Masaaki Morita

    Citation: Earth, Planets and Space 2019 71:7

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  2. Content type: Full paper

    Pure magnetite experiences a first-order phase transition (the Verwey transition) near 120–125 K wherein the mineral’s symmetry changes from cubic to monoclinic. This transformation results in the formation of...

    Authors: Anna K. Lindquist, Joshua M. Feinberg, Richard J. Harrison, James C. Loudon and Andrew J. Newell

    Citation: Earth, Planets and Space 2019 71:5

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  3. Content type: Frontier letter

    Results from the first VHF profiler research radar in Costa Rica, operating at a central radar frequency of 46.6 MHz, are presented. Emphasis has been on studies of scattering layers detected in the altitude r...

    Authors: Marcial Garbanzo-Salas and Wayne Hocking

    Citation: Earth, Planets and Space 2019 71:6

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  4. Content type: Full paper

    The vertical fine structures and the time evolution of plasma irregularities in the sporadic E (Es) layer were observed via calcium ion (Ca+) density measurements using a resonance scattering lidar with a high ti...

    Authors: Mitsumu K. Ejiri, Takuji Nakamura, Takuo T. Tsuda, Takanori Nishiyama, Makoto Abo, Toru Takahashi, Katsuhiko Tsuno, Takuya D. Kawahara, Takayo Ogawa and Satoshi Wada

    Citation: Earth, Planets and Space 2019 71:3

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  5. Content type: Full paper

    We aim to obtain a modal decomposition of the internal geomagnetic field. In order to do so, we perform a principal component analysis of two virtual observatory datasets, with 4-month sampling time, from the ...

    Authors: João Domingos, Maria Alexandra Pais, Dominique Jault and Mioara Mandea

    Citation: Earth, Planets and Space 2019 71:2

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  6. Content type: Full paper

    Continuous measurements of soil CO2 flux are useful for understanding degassing processes and for monitoring volcanic activities. Recent studies at many volcanoes have revealed that soil CO2 flux variations are s...

    Authors: Masaaki Morita, Toshiya Mori, Akihiko Yokoo, Takahiro Ohkura and Yuichi Morita

    Citation: Earth, Planets and Space 2019 71:1

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  7. Content type: Express Letter

    Rootless eruption is caused by lava flow entering inland water or wet sediment and forms craters and cones far from the actual vent. Since the rootless eruption can be significantly explosive, the possibility ...

    Authors: Rina Noguchi, Ai Hamada, Ayako I. Suzuki and Kei Kurita

    Citation: Earth, Planets and Space 2018 70:208

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  8. Content type: Full paper

    Solar wind particles and ionospheric O+ ions influence the near-Earth plasma sheet and inner magnetospheric composition. We studied the behavior of H+, O+ and He+ ions (9–210 keV) for intense and moderate geomagn...

    Authors: Megha Pandya, Bhaskara Veenadhari, Masahito Nosé, Sandeep Kumar, Geoff D. Reeves and A. T. Y. Lui

    Citation: Earth, Planets and Space 2018 70:203

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  9. Content type: Full paper

    Generally, the dynamical model is used to estimate coordinates of satellite laser ranging (SLR) stations. In this paper, we put forward a kinematic method to estimate the coordinates of SLR stations by using g...

    Authors: Jinyun Guo, Youcun Wang, Yi Shen, Xin Liu, Yu Sun and Qiaoli Kong

    Citation: Earth, Planets and Space 2018 70:201

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  10. Content type: Express Letter

    When an explosive eruption, such as a Plinian eruption, occurs, in order to estimate ash fall around the volcano and for hazard mitigation, a numerical model is often used. Simulation by a numerical model need...

    Authors: Kensuke Ishii

    Citation: Earth, Planets and Space 2018 70:202

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  11. Content type: Full paper

    In order to verify the time variability of free core nutation (FCN) period, global superconducting gravimeter (SG) observations were analyzed based on synthetic test data. The gravity data series were synthesi...

    Authors: Xiaoming Cui, Heping Sun, Jianqiao Xu, Jiangcun Zhou and Xiaodong Chen

    Citation: Earth, Planets and Space 2018 70:199

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  12. Content type: Full paper

    Solar flares cause a rapid increase in ionization in the ionosphere owing to significant enhancement of ionizing solar radiation in the X-ray and extreme ultraviolet (EUV) spectral ranges. The change of electr...

    Authors: Jaroslav Chum, Jaroslav Urbář, Jan Laštovička, Miguel Angel Cabrera, Jann-Yenq Liu, Fernando Alberto Miranda Bonomi, Mariano Fagre, Jiří Fišer and Zbyšek Mošna

    Citation: Earth, Planets and Space 2018 70:198

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  13. Content type: Full paper

    Petrological observations and chemical analyses of melt inclusions in scoria were used to investigate the magma ascent and eruption processes of the 1979, 1989, and 2014 eruptions of Nakadake, Aso volcano, Jap...

    Authors: Genji Saito, Osamu Ishizuka, Yoshihiro Ishizuka, Hideo Hoshizumi and Isoji Miyagi

    Citation: Earth, Planets and Space 2018 70:197

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  14. Content type: Full paper

    Seafloor hydrothermal systems in the back-arc region of the Okinawa Trough have been viewed as a modern analogue to the Kuroko-type volcanogenic massive sulfide deposits. Detection of magnetic signatures is wi...

    Authors: Masakazu Fujii, Hiroshi Sato, Eri Togawa, Kazuhiko Shimada and Jun-ichiro Ishibashi

    Citation: Earth, Planets and Space 2018 70:196

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  15. Content type: Technical report

    The Hayabusa2 mission aims to obtain pristine samples from a near-Earth carbonaceous-type (C-type) asteroid, 162173 Ryugu, and return them to Earth. One of the scientific goals of the mission is to understand ...

    Authors: Haruna Sugahara, Yoshinori Takano, Yuzuru Karouji, Kazuya Kumagai, Toru Yada, Naohiko Ohkouchi and Masanao Abe

    Citation: Earth, Planets and Space 2018 70:194

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  16. Content type: Full paper

    In 2014, a phreatic eruption occurred at the Ontake Volcano in Central Japan causing multiple deaths and missing persons. Interferometric Synthetic Aperture Radar data showed local-scale subsidence around the ...

    Authors: Shohei Narita and Makoto Murakami

    Citation: Earth, Planets and Space 2018 70:191

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  17. Content type: Technical report

    A new five-wavelength photometer was developed and installed at the EISCAT Tromsø site (69.6°N, 19.2°E) in January 2017. The photometer consists of two units: an optical unit and a control unit together with a...

    Authors: Satonori Nozawa, Tetsuya Kawabata, Keisuke Hosokawa, Yasunobu Ogawa, Takuo Tsuda, Akira Mizuno, Ryoichi Fujii and Chris Hall

    Citation: Earth, Planets and Space 2018 70:193

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  18. Content type: Full paper

    In order to investigate the role of dikes in the volcanic evolution and the triggering mechanisms of catastrophic mass wasting volcanoes, we have sampled for a pilot study, seven dikes within the Wai’anae volc...

    Authors: Emilio Herrero-Bervera, Bernard Henry and Mário Moreira

    Citation: Earth, Planets and Space 2018 70:190

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  19. Content type: Full paper

    We analyzed strong-motion and broadband recordings of two moderate-magnitude earthquakes that occurred in the Nankai Trough. The first event was the 2004 Mw 6.5 southeast off-Kii peninsula earthquake, an after...

    Authors: Yadab P. Dhakal, Wataru Suzuki, Takeshi Kimura, Nobuyuki Morikawa, Takashi Kunugi and Shin Aoi

    Citation: Earth, Planets and Space 2018 70:189

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  20. Content type: Full paper

    The Kairei (KHF) and Yokoniwa hydrothermal fields (YHF) are hosted in mafic as well as ultramafic rocks distributed at an off-axis volcanic knoll of the Central Indian Ridge. Despite intensive investigations, ...

    Authors: Masakazu Fujii and Kyoko Okino

    Citation: Earth, Planets and Space 2018 70:188

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  21. Content type: Correction

    After publication of this article (Kaneko et al. 2018), it is noticed there is an error in Fig. 3b; the lower 2.3-µm band image is mistakenly removed. The correct Fig. 3 is given below.

    Authors: Takayuki Kaneko, Atsushi Yasuda, Yoshito Yoshizaki, Kenji Takasaki and Yoshiaki Honda

    Citation: Earth, Planets and Space 2018 70:187

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    The original article was published in Earth, Planets and Space 2018 70:175

  22. Content type: Technical report

    Chemical demagnetization is not preferred as a demagnetizing method in paleomagnetism because strong acids are cumbersome to handle and require considerable time compared to alternating field and thermal demag...

    Authors: Chisato Anai, Nobutatsu Mochizuki and Hidetoshi Shibuya

    Citation: Earth, Planets and Space 2018 70:184

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  23. Content type: Full paper

    Our investigations are based on the property that the fields of sources, whose depths are numerically equal to survey heights, are most brightly presented in the data of magnetic survey. Therefore, the magneti...

    Authors: Yury P. Tsvetkov, Konstantin V. Novikov, Andrey A. Ivanov and Oleg M. Brekhov

    Citation: Earth, Planets and Space 2018 70:183

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  24. Content type: Express Letter

    Seismic swarm areas below the southeast flank of Ontake volcano, central Japan, provide an important opportunity to study interactions between seismicity, volcanic processes and crustal fluid. On June 25, 2017...

    Authors: Hiroshi Ichihara, Junna Kanehiro, Toru Mogi, Koshun Yamaoka, Noriko Tada, Edward Alan Bertrand and Mamoru Adachi

    Citation: Earth, Planets and Space 2018 70:182

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  25. Content type: Express Letter

    We successfully monitored the ground deformation of an eruption center during the 2015 phreatic eruption of Hakone volcano, Japan, using ground-based interferometric synthetic aperture radar (GB-InSAR). GB-InS...

    Authors: Senro Kuraoka, Yuichi Nakashima, Ryosuke Doke and Kazutaka Mannen

    Citation: Earth, Planets and Space 2018 70:181

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  26. Content type: Full paper

    This work describes several important improvements made to the International Reference Ionosphere UPdate (IRI UP) method, and a careful validation of its performances under disturbed conditions. The IRI UP met...

    Authors: Alessio Pignalberi, Marco Pietrella, Michael Pezzopane and Rolando Rizzi

    Citation: Earth, Planets and Space 2018 70:180

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  27. Content type: Frontier letter

    Investigations of superchrons are the key to understanding long-term changes of the geodynamo and the mantle’s controlling role. Granitic rocks could be good recorders of deep-time geomagnetic field behavior, ...

    Authors: Chie Kato, Masahiko Sato, Yuhji Yamamoto, Hideo Tsunakawa and Joseph L. Kirschvink

    Citation: Earth, Planets and Space 2018 70:176

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  28. Content type: Full paper

    The April 27, 2016 eruption sequence at White Island was comprised of 6 discrete eruptive events that occurred over a 35-min period. Seismicity included three episodes of VLP activity: the first occurring ~ 2 ...

    Authors: Arthur Jolly, Ivan Lokmer, Bruce Christenson and Johannes Thun

    Citation: Earth, Planets and Space 2018 70:177

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  29. Content type: Express Letter

    Volcanic eruptions bring high-temperature gas or magma to the surface. Therefore, thermal observations of volcanic eruptions can be used to investigate the timeline of eruptive sequences. Eruptive activity inc...

    Authors: Takayuki Kaneko, Atsushi Yasuda, Yoshito Yoshizaki, Kenji Takasaki and Yoshiaki Honda

    Citation: Earth, Planets and Space 2018 70:175

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    The Correction to this article has been published in Earth, Planets and Space 2018 70:187

  30. Content type: Express Letter

    It has been known that the Alfvén velocity plays a significant role in generation and propagation of magnetohydrodynamic (MHD) waves. Until now, however, the global distribution of the Alfvén velocity in the m...

    Authors: Khan-Hyuk Kim, Gi-Jeong Kim and Hyuck-Jin Kwon

    Citation: Earth, Planets and Space 2018 70:174

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  31. Content type: Full paper

    Imaging the shallow velocity structures beneath Aso caldera is necessary to further understand volcanism at the volcano and in the region. The network for monitoring Aso volcano has been progressively renewed ...

    Authors: Yu-Chih Huang, Takahiro Ohkura, Tsuneomi Kagiyama, Shin Yoshikawa and Hiroyuki Inoue

    Citation: Earth, Planets and Space 2018 70:169

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  32. Content type: Full paper

    This study investigates phreatic eruptions at two similar volcanoes, Kawah Ijen (Indonesia) and White Island (New Zealand). By carefully processing broadband seismic signals, we reveal seismic signatures and c...

    Authors: Corentin Caudron, Benoit Taisne, Jurgen Neuberg, Arthur D. Jolly, Bruce Christenson, Thomas Lecocq, Suparjan, Devy Syahbana and Gede Suantika

    Citation: Earth, Planets and Space 2018 70:168

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  33. 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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