@article{39867f1b55814bd390f8316ab5307ffe,
title = "Jovian UV Aurora's Response to the Solar Wind: Hisaki EXCEED and Juno Observations",
abstract = "We summarize Jupiter's ultraviolet (UV) auroral response to solar wind dynamic pressure variations during Juno's approach to Jupiter in 2016. The response time of Jupiter's aurora to external drivers has thus far been unknown owing to a sparsity of upstream in situ solar wind measurements. Combining the Juno solar wind observations with continuous UV aurora data obtained by Hisaki EXCEED (Extreme Ultraviolet Spectroscope for Exospheric Dynamics) and Juno UV spectrograph, the UV aurora brightenings in response to three major shock arrivals showed time lags of 10–15 hr. These time lags are longer than the time required for ballistic propagation of the shocks by the solar wind. In addition to that puzzle, while an enhancement in the UV auroral power was observed with an increase in dynamic pressure to ~0.03 nPa, no associated brightening was observed with a dynamic pressure elevation of >0.1 nPa. These imply that internal magnetospheric aspects need to be taken into consideration to fully resolve the issue.",
keywords = "Jupiter, aurora, magnetosphere, solar wind",
author = "H. Kita and Tomoki Kimura and C. Tao and F. Tsuchiya and G. Murakami and A. Yamazaki and K. Yoshioka and Ebert, {R. W.} and Wilson, {R. J.} and F. Allegrini and G. Clark and Connerney, {J. E.P.} and Gladstone, {G. R.} and I. Yoshikawa and M. Fujimoto",
note = "Funding Information: ). Juno UVS data are archived in NASA's Planetary Data System ( The data of Hisaki satellite are archived in the Data Archives and Transmission System (DARTS) of ISAS/JAXA ( http://darts.isas.jaxa.jp ). The Juno Solar Wind data used in this study may be found in the supporting information section of Wilson et al. ( http://pds‐atmospheres.nmsu.edu/data_and_services/atmospheres_data/JUNO/juno.html ). The authors acknowledge the support of ISSI, as this study was discussed within ISSI International Team “The influence of Io on Jupiter's magnetosphere”. This work was supported by JSPS KAKENHI grants JP26287122, 19H01948 and 17H02965. H. K. was supported by Grant‐in‐Aid for JSPS Research Fellow. F. T. was supported by JSPS KAKENHI grant 26400476. T. K. was supported by JSPS KAKENHI grant K16K178120. Funding Information: The data of Hisaki satellite are archived in the Data Archives and Transmission System (DARTS) of ISAS/JAXA (http://darts.isas.jaxa.jp). The Juno Solar Wind data used in this study may be found in the supporting information section of Wilson et al. (). Juno UVS data are archived in NASA's Planetary Data System (http://pds-atmospheres.nmsu.edu/data_and_services/atmospheres_data/JUNO/juno.html). The authors acknowledge the support of ISSI, as this study was discussed within ISSI International Team ?The influence of Io on Jupiter's magnetosphere?. This work was supported by JSPS KAKENHI grants JP26287122, 19H01948 and 17H02965. H. K. was supported by Grant-in-Aid for JSPS Research Fellow. F. T. was supported by JSPS KAKENHI grant 26400476. T. K. was supported by JSPS KAKENHI grant K16K178120. Publisher Copyright: {\textcopyright}2019. American Geophysical Union. All Rights Reserved.",
year = "2019",
month = dec,
day = "1",
doi = "10.1029/2019JA026997",
language = "English",
volume = "124",
pages = "10209--10218",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9380",
number = "12",
}