Variation of Jupiter's aurora observed by Hisaki/EXCEED: 1. Observed characteristics of the auroral electron energies compared with observations performed using HST/STIS

Tao, Chihiro and Kimura, Tomoki and Badman, Sarah Victoria and Murakami, Go and Yoshioka, Kazuo and Tsuchiya, Fuminori and André, Nicolas and Yoshikawa, Ichiro and Yamazaki, Atsushi and Shiota, Daikou and Tadokoro, Hiroyasu and Fujimoto, Masaki (2016) Variation of Jupiter's aurora observed by Hisaki/EXCEED: 1. Observed characteristics of the auroral electron energies compared with observations performed using HST/STIS. Journal of Geophysical Research: Space Physics, 121 (5). pp. 4041-4054. ISSN 2169-9402

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Abstract

Temporal variation of Jupiter's northern aurora is detected using the Extreme Ultraviolet Spectroscope for Exospheric Dynamics (EXCEED) on board JAXA's Earth-orbiting planetary space telescope Hisaki. The wavelength coverage of EXCEED includes the H2 Lyman and Werner bands at 80–148 nm from the entire northern polar region. The prominent periodic modulation of the observed emission corresponds to the rotation of Jupiter's main auroral oval through the aperture, with additional superposed −50%–100% temporal variations. The hydrocarbon color ratio (CR) adopted for the wavelength range of EXCEED is defined as the ratio of the emission intensity in the long wavelength range of 138.5–144.8 nm to that in the short wavelength range of 126.3–130 nm. This CR varies with the planetary rotation phase. Short- (within one planetary rotation) and long-term (> one planetary rotation) enhancements of the auroral power are observed in both wavelength ranges and result in a small CR variation. The occurrence timing of the auroral power enhancement does not clearly depend on the central meridian longitude. Despite the limitations of the wavelength coverage and the large field of view of the observation, the auroral spectra and CR-brightness distribution measured using EXCEED are consistent with other observations.

Item Type: Journal Article
Journal or Publication Title: Journal of Geophysical Research: Space Physics
Additional Information: Accepted for publication in Journal of Geophysical Research: Space Physics. Copyright 2016 American Geophysical Union. Further reproduction or electronic distribution is not permitted. Tao, C., et al. (2016), Variation of Jupiter's aurora observed by Hisaki/EXCEED: 1. Observed characteristics of the auroral electron energies compared with observations performed using HST/STIS, J. Geophys. Res. Space Physics, 121, doi:10.1002/2015JA021271. To view the published open abstract, go to http://dx.doi.org and enter the DOI.
Departments: Faculty of Science and Technology > Physics
ID Code: 79689
Deposited By: ep_importer_pure
Deposited On: 27 May 2016 10:32
Refereed?: Yes
Published?: Published
Last Modified: 18 Oct 2019 00:42
URI: https://eprints.lancs.ac.uk/id/eprint/79689

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