Telescope of extreme ultraviolet boarded on KAGUYA: Science from the moon

Ichiro Yoshikawa, Go Murakami, Fukuhiro Ezawa, Kazuo Yoshioka, Yuki Obana, Makoto Taguchi, Atsushi Yamazaki, Shingo Kameda, Masato Nakamura, Masayuki Kikuchi, Masato Kagitani, Shoichi Okano, Kazuo Shiokawa, Wataru Miyake

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


We have succeeded in observations by the Telescope of Extreme Ultraviolet (TEX) aboard Japan's lunar orbiter KAGUYA to characterize the evolution of the Earth's plasmasphere. The view afforded by the KAGUYA orbit encompasses the plasma distribution in a single exposure, enabling us to examine for the first time the globally-averaged properties of the plasmasphere from the side (meridian) view. We focus on a study period that began with a likely moderate erosion event of plasma patches in a geomagnetically disturbed period, and follow refilling of plasma from the upper ionosphere. The Earth's plasmasphere grew up to saturated level at the rate of approximately 1,600 km per day to 4,800 km per day on the equatorial plane. From the “side view” of the Earth, a specific magnetic flux tube with cold dense plasmas was seen and likely moved to outer magnetosphere, even while geomagnetic activity was low. From the moon, we are studying the terrestrial plasmas in the vicinity of the Earth. This is called “Geoscience from the Moon”.

Original languageEnglish
Title of host publicationAdvances in Geosciences
Subtitle of host publicationVolume 19: Planetary Science (PS)
PublisherWorld Scientific Publishing Co.
Number of pages14
ISBN (Electronic)9789812838162
ISBN (Print)9812838155, 9789812838155
Publication statusPublished - 2010 Jan 1


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