IOPW Aurora amd Magnetosphere sub-Discipline

                          Update Oct 2017

   There has been a high level of activity in the study of both Saturn
and Jupiter, covering both aurora and magnetospheres.  At Saturn the 
final / proximal orbits of Cassini covered regions of the inner 
magnetosphere and at high latitudes that have never before been
measured in situ.  At Jupiter the arrival of the JUNO spacecraft, also
covering high latitude and low altitude regions never before measured, 
has provided a wealth of new data with quite surprising results.  This 
work was reported at the June 2017 Magnetospheres of the Outer Planets 
conference, held in Uppsala Sweden (http://www.irfu.se/mop2017/).  The 
next MOP meeting will be in July 2018 in Boulder CO.  The higher than 
usual frequency of these meetings reflects the rapidly changing results 
from mission at both Saturn (Cassini) and Jupiter (Juno).  

   Considerable effort and telescope time at a wide range of earth-based
facilities has been devoted to coordinated studies of both planets.  The
HST programs have included a multi-year program for Saturn’s aurora, led
by Laurent Lamy and Sarah Badman.  For Jupiter there was a medium-sized
program led by Jon Nichols to observe the aurora as JUNO approached Jupiter
and measured the upstream solar wind.  There is now a large HST program
for Jupiter led by Denis Grodent during the main orbits of JUNO, and
these observations are concentrating on the close passes of JUNO over
the polar regions.  Multiple ground-based facilities have been used for 
IR observations of Jupiter’s aurora and ionosphere, led by Tom Stallard,
Luke Moore, James O’Donoghue, and others.  This work is for the most part
in progress, and there is a very active comparison of the data sets with
the measurements from Cassini and JUNO.  

   On a fun note, there was an HST UV imaging observation of Saturn that
was intended to cover the time of the Cassini spacecraft entry into the
atmosphere, looking for emissions from the flare, led by Frank Crary.  
Unfortunately from the orbital location of HST, Saturn rose above the
Earth a bit late, and the observation began 700 sec. after the predicted
peak in the fireball.  No positive detection of the fireball has been
forthcoming.  

New Publications (you can find links to specific papers under the publications menu tab): 

“Angular Extension of Io Magnetic Footprint in Response to Io’s Locations”, 
S. Wannawichian, J.T. Clarke, and J.D. Nichols, Chiang Mai Journal of Science, 
43, 870-875 (2016).

“Variability of Jupiter’s IR H3+ Aurorae During Juno Approach”, L. Moore, 
et al., Geophys. Res. Lett., 44, 4513-4522, doi:10.1002/2017GL073156 (2017). 

“Juno observations of energetic charged particles over Jupiter's polar 
regions: Analysis of monodirectional and bidirectional electron beams”, B.
Mauk et al., Geophys. Res. Lett., 44, 4410-4418, doi:10.1002/2016GL072286 (2017). 

“Morphology of the UV aurorae Jupiter during Juno's first perijove observations”,
B. Bonfond et al., Geophys. Res. Lett., 44, 4463-4471, doi:10.1002/2017GL073114 
(2017). 

“Preliminary JIRAM results from Juno polar observations: 2. Analysis of the 
Jupiter southern H3+ emissions and comparison with the north aurora”, A. 
Adriani et al., Geophys. Res. Lett., 44, 4633-4640, doi:10.1002/2017GL072905, 
(2017). 

“Jupiter’s magnetosphere and aurorae observed by the Juno spacecraft during 
its first polar orbits”, J. Connerney et al., Science, 356, 826-832,
doi:10.1126/science.aam5928 (2017)

“Infrared observations of Jovian aurora from Juno's first orbits: Main oval 
and satellite footprints”, A. Mura et al., Geophys. Res. Lett., 44, 5308-5316,
doi: 10.1002/2017GL072954 (2017). 

“A new view of Jupiter's auroral radio spectrum”, W. Kurth et al., Geophys. 
Res. Lett., 44, 7114-7121, doi:10.1002/2017GL072889 (2017). 

“Electron beams and loss cones in the auroral regions of Jupiter”, F. Allegrini
et al., Geophys. Res. Lett., 44, 7131-7139, doi:10.1002/2017GL073180 (2017). 

“Response of Jupiter’s Auroras to Conditions in the Interplanetary Medium 
as Measured by the Hubble Space Telescope and Juno”, J. Nichols et al., 
Geophys. Res. Lett., 44, 7643-7652, doi:10.1002/2017GL073029 (2017). 

“Juno-UVS approach observations of Jupiter's auroras”, G.R. Gladstone et al.,
Geophys. Res. Lett., 44, 7668-7675, doi:10.1002/2017GL073377 (2017). 

“Survey of Saturn electrostatic cyclotron harmonic wave intensity”, D. 
Menietti et al., J. Geophys. Res., 122, 8214-8227, doi:10.1002/2017JA023929 
(2017).  

“Energetic particle signatures of magnetic field-aligned potentials over 
Jupiter's polar regions”, G. Clark et al., Geophys. Res. Lett., 44, 
8703-8711, doi:10.1002/2017GL074366 (2017). 

“Discrete and broadband electron acceleration in Jupiter's powerful aurora”,
B. Mauk et al., Nature, 549, 7670, 66-69, doi:10.1038/nature23648 (2017).

“An Isolated, Bright Cusp Aurora at Saturn”, J. Kinrade et al., J. Geophys. 
Res., 122, 6121-6138, doi:10.1002/2016JA023792 (2017).  

“Jupiter's polar ionospheric flows: High resolution mapping of spectral 
intensity and line-of-sight velocity of H3+ ions”, R. Johnson et al., 
J. Geophys. Res., 122, 7599-7618, doi:10.1002/2017JA024176 (2017). 

“Transient brightening of Jupiter's aurora observed by the Hisaki satellite 
and Hubble Space Telescope during approach phase of the Juno spacecraft”, 
T. Kimura et al., Geophys. Res. Lett., 44, 4523-4531, doi:10.1002/2017GL072912,
(2017). 

“Magnetosphere-ionosphere coupling at Jupiter: Expectations for Juno Perijove 
1 from a steady state axisymmetric physical model”, S. Cowley et al., 
Geophys. Res. Lett., 44, 4497-4505, doi:10.1002/2017GL073129 (2017). 

“The aurorae of Uranus past equinox”, L. Lamy et al., J. Geophys. Res., 122, 
3997-4008, doi:10.1002/2017JA023918 (2017). 

“Statistical study of Saturn's auroral electron properties with Cassini/UVIS 
FUV spectral images”, J. Gustin et al., Icarus, 284, 264-283, 
doi:10.1016/j.icarus.2016.11.017 (2017). 

See also a set of other papers in Geophys. Res. Lett. volume 44 (2017) that
resulted from the initial publication of JUNO results at Jupiter.