@article{ba3129ab7bf744538cd0ae7be2f85fc1,
title = "The time variation of atomic oxygen emission around Io during a volcanic event observed with Hisaki/EXCEED",
abstract = "Io has an atmosphere produced by volcanism and sublimation of frosts deposited around active volcanoes. However, the time variation of atomic oxygen escaping Io's atmosphere is not well known. In this paper, we show a significant increase in atomic oxygen around Io during a volcanic event. Brightening of Io's extended sodium nebula was observed in the spring of 2015. We used the Hisaki satellite to investigate the time variation of atomic oxygen emission around Io during the same period. This investigation reveals that the duration of atomic oxygen brightness increases from a volcanically quiet level to a maximum level during the same approximate time period of 30 days as the observed sodium brightness. On the other hand, the recovery of the atomic oxygen brightness from the maximum to the quiet level (60 days) was longer than that of the sodium nebula decreasing (40 days). Additionally, a dawn-dusk asymmetry of the atomic oxygen emission is observed.",
keywords = "Atomic oxygen, Io, Neutral cloud, Volcanism",
author = "Ryoichi Koga and Fuminori Tsuchiya and Masato Kagitani and Takeshi Sakanoi and Mizuki Yoneda and Kazuo Yoshioka and Tomoki Kimura and Go Murakami and Atsushi Yamazaki and Ichiro Yoshikawa and Smith, {H. Todd}",
note = "Funding Information: We thank all the members of the Hisaki science team. The Hisaki/EXCEED data is archived in the Data Archives and Transmission System (DARTS) ( http://hisaki.darts.isas.jaxa.jp/ ). This work was supported by JSPS KAKENHI grant nos. JP26400476 and JP17H02965 . This work was done in the frame of the International Team collaboration number 388 supported by the International Space Science Institute in Bern, Switzerland. The SORCE solar spectral irradiance data is archived at the LASP Interactive Solar Irradiance Data Center (LISIRD) ( http://lasp.colorado.edu/lisird/index.html ). CHIANTI is a collaborative project involving the University of Cambridge (UK), George Mason University (USA), and the University of Michigan (USA). Publisher Copyright: {\textcopyright} 2017 Elsevier Inc.",
year = "2018",
month = jan,
day = "1",
doi = "10.1016/j.icarus.2017.07.024",
language = "English",
volume = "299",
pages = "300--307",
journal = "Icarus",
issn = "0019-1035",
publisher = "Academic Press Inc.",
}