Variation of Jupiter's aurora observed by Hisaki/EXCEED: 1. Observed characteristics of the auroral electron energies compared with observations performed using HST/STIS - Archive ouverte HAL Access content directly
Journal Articles Journal of Geophysical Research: Space Physics Year : 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

(1) , , , , , , (1) , , , , ,
1
Tomoki Kimura
Sarah V. Badman
  • Function : Author
Go Murakami
Kazuo Yoshioka
Fuminori Tsuchiya
Ichiro Yoshikawa
Atsushi Yamazaki
Daikou Shiota
  • Function : Author
Hiroyasu Tadokoro
  • Function : Author
Masaki Fujimoto
  • Function : Author

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.
Fichier principal
Vignette du fichier
JGR Space Physics - 2016 - Tao - Variation of Jupiter s aurora observed by Hisaki EXCEED 1 Observed characteristics of.pdf (4.35 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03670235 , version 1 (17-05-2022)

Licence

Copyright

Identifiers

Cite

Chihiro Tao, Tomoki Kimura, Sarah V. Badman, Go Murakami, Kazuo Yoshioka, et al.. 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, 2016, 121, pp.4041-4054. ⟨10.1002/2015JA021271⟩. ⟨insu-03670235⟩
3 View
7 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More