(Proposal ID) S16A-007

(PI) Kasaba, Yasumasa

(Proposal Title)
High spatially resolved Jovian northern IR aurora with Hisaki, Juno, and HST

(Abstract)
We propose the IRCS observation of Jovian northern IR aurora, which consists 
of H_2 (neutral) and H_3^+ (plasma) emissions, in May-June 2015.  Simultaneous
 spectroscopy of multiple H_2 and H_3^+ emission lines in K-band and H_3^+ 
line images in L-band can be taken with the highest spatial resolution (0.1" = 
200km at Jupiter) assisted by AO188 locked to Galilean satellites on 19, 21, 
24 May, and 2 June. This capability enables us the unique study of neutral and 
plasma atmospheres driving and heated by Jovian magnetosphere. Our observation 
is linked to the world-wide campaign during the NASA Juno spacecraft approach 
to Jupiter. It is a strategic time when we have full information on the 
upstream solar wind characteristics. JAXA Hisaki is also providing the total 
northern aurora flux in UV and spatially resolved Io plasma torus spectrum in 
EUV continuously. Coupling with both and other ground-based observations, we 
will investigate the effect of solar wind onto the Jovian Magnetosphere - 
Ionosphere - Thermosphere coupling system. From May 16 to June 11 2016, 
northern UV aurora will also be observed by Hubble Space Telescope in 1 orbit 
- 3 orbits (19 May) per day. It also provides a first chance to compare UV - 
IR aurora morphology with highest spatial resolution.