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  • May 15, 2018

Salt shell fallout during the ash eruption at the Nakadake crater, Aso volcano, Japan: evidence of an underground hydrothermal system surrounding the erupting vent

Interaction of magmatic-hydrothermal systems often controls styles and evolution of volcanic activities. Shinohara et al. (2018) revealed continuous existence of a hydrothermal system beneath the crater floor even during magmatic eruptions based on observations of a variety of salt fallouts at Aso volcano, Nakadake crater. Fragile hollow structure of salt fallouts observed during magmatic ash eruption in 2015 indicates their formation by the heating of hydrothermal solution droplets suspended by… Read more

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  • March 28, 2018

EPS Excellent Paper Award 2017

Yoshifumi Saito, Masaki N. Nishino, Masaki Fujimoto, Tadateru Yamamoto, Shoichiro Yokota, Hideo Tsunakawa, Hidetoshi Shibuya, Masaki Matsushima, Hisayoshi Shimizu, Futoshi Takahashi (2012), Simultaneous observation of the electron acceleration and ion deceleration over lunar magnetic anomalies, Earth Planets Space, 64:4, 83-92, doi:10.5047/eps.2011.07.011 To understand the interaction between solar wind and lunar magnetic anomalies, low energy electrons and ions over lunar magnetic anomalies were simultaneously observed for the first time by the… Read more

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  • March 28, 2018

EPS Young Researcher Award 2017

Hisashi Hayakawa, Harufumi Tamazawa, Akito Davis Kawamura, Hiroaki Isobe (2015), Records of sunspot and aurora during CE 960-1279 in the Chinese chronicle of the Sòng dynasty, Earth, Planets and Space, 67:82, doi:10.1186/s40623-015-0250-y In this study, records of solar and auroral activities from the 10th to 13th centuries were retrieved from the Chinese chronicle of the Sòng dynasty. The accuracy of these records were tested scientifically through comparison with the 14C… Read more

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  • November 13, 2017

Performance of Akatsuki/IR2 in Venus orbit: the first year

It is essential for instruments, that work in space or at or near the target bodies, to be characterized under the actual operating conditions. Establishing the procedure of data processing is important as well. IR2, which cools its sensor and optics by a cryo-cooler, is affected in particular by thermal environment in the orbit. Satoh et al. (2017) made efforts to produce the data with best possible quality by understanding… Read more

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  • November 7, 2017

Near-Earth plasma sheet boundary dynamics during substorm dipolarization

Nakamura et al. (2017) report on the evolution of the near-Earth plasma sheet boundary during an intense substorm. Based on multi-point analysis using the four-spacecraft measurements from Magnetospheric Multiscale (MMS) together with Geotail and GOES spacecraft and comparison with MHD model of the reconnection jet, spatial structure of the high-speed plasma flows and associated field-aligned current pattern are deduced. It is shown that the dynamics in the boundary region of the near-Earth plasma sheet are controlled both by the Earthward flow braking process and by the accumulated magnetic flux due to near-Earth reconnection evolving tailward. Click to view the article Read more

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  • August 21, 2017

Volcanic activity on Io and its influence on the dynamics of the Jovian magnetosphere observed by EXCEED/Hisaki in 2015

Jupiter's moon Io, which orbits deep inside the magnetosphere, is the most geologically active object in the solar system. Kurdalagon Patera, a volcano on Io, erupted in 2015 and became a substantial source of Jovian magnetospheric plasma. Based on Earth-orbiting spacecraft observations, Io plasma torus (IPT) exhibited the peak intensity (nearly double) of ionic sulfur emissions roughly 2 month later, followed by a decay phase. This environmental change provides a… Read more

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  • July 11, 2017

Design and operation of a 1500-m laser strainmeter installed at an underground site in Kamioka, Japan

A laser strainmeter with a 1500 m baseline was constructed at an underground site in Kamioka, Gifu Prefecture, Japan. The interferometer using a high frequency-stabilized laser measures the change in distance between two retroreflectors in the tunnel of the KAGRA gravitational-wave telescope. Since operations began in August 2016, ground motions with various timescales have been detected. The tidal waveform agrees with the theoretical waveform after topographic corrections. The strain spectrum indicates the lowest background noise of less than 10−12 in the mHz band. The strainmeter provides a new method for observing low frequency ground motion on seismic, geodetic, and intermediate timescales. Click to view the article Read more