TY - JOUR
T1 - Measurements of the rotation rate of the jovian mid-to-low latitude ionosphere
AU - Johnson, Rosie E.
AU - Stallard, Tom S.
AU - Melin, Henrik
AU - Miller, Steve
AU - Nichols, Jonathan D.
N1 - Funding Information:
REJ was supported by STFC studentship X423ST02. TSS, HM and SM are visiting Astronomers at the Infrared Telescope Facility, which is operated by the University of Hawaii under Cooperative Agreement no. NNX-08AE38A with the NASA, Science Mission Directorate, Planetary Astronomy Program. This work was supported by the UK STFC Grant ST/K001000/1 and ST/N000749/1 for HM and TSS. JDN was supported by an STFC Advanced Fellowship ST/I004084/1.
Publisher Copyright:
© 2016
PY - 2016/12/1
Y1 - 2016/12/1
N2 - Previous studies of Jupiter's upper atmosphere often assume that the mid-to-low latitude ionosphere is corotating, but a model describing an observed asymmetry in hydrogen Lyman-α emission (∼1000 km above the 1 bar level) disagrees with this assumption. From measurements of the Doppler shifted H3+ν2Q(1,0−) line at 3.953 μm using the IRTF, the line-of-sight velocities of the H3+ ions were derived in the planetary reference frame and found to be 0.091 ± 0.250.33em0exkm0.33em0exs−1, 0.0082 ± 0.300.33em0exkm0.33em0exs−1 and 0.31 ± 0.510.33em0exkm0.33em0exs−10.33em0exin 1998, 2007 and 2013 respectively. These zero velocities represent corotation at the mid-to-low latitude region of Jupiter's ionosphere. There is no evidence of flows associated with the hydrogen Lyman-α emission asymmetries detected in the peak H3+ emission layer (∼550 km above the 1 bar level), and we assert that the H3+ ions in Jupiter's mid-to-low latitude are rigidly corotating.
AB - Previous studies of Jupiter's upper atmosphere often assume that the mid-to-low latitude ionosphere is corotating, but a model describing an observed asymmetry in hydrogen Lyman-α emission (∼1000 km above the 1 bar level) disagrees with this assumption. From measurements of the Doppler shifted H3+ν2Q(1,0−) line at 3.953 μm using the IRTF, the line-of-sight velocities of the H3+ ions were derived in the planetary reference frame and found to be 0.091 ± 0.250.33em0exkm0.33em0exs−1, 0.0082 ± 0.300.33em0exkm0.33em0exs−1 and 0.31 ± 0.510.33em0exkm0.33em0exs−10.33em0exin 1998, 2007 and 2013 respectively. These zero velocities represent corotation at the mid-to-low latitude region of Jupiter's ionosphere. There is no evidence of flows associated with the hydrogen Lyman-α emission asymmetries detected in the peak H3+ emission layer (∼550 km above the 1 bar level), and we assert that the H3+ ions in Jupiter's mid-to-low latitude are rigidly corotating.
KW - Infrared observations
KW - Ionosphere
KW - Jupiter, atmospheres
KW - Spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=84978842707&partnerID=8YFLogxK
U2 - 10.1016/j.icarus.2016.06.026
DO - 10.1016/j.icarus.2016.06.026
M3 - Article
SN - 0019-1035
VL - 280
SP - 249
EP - 254
JO - Icarus
JF - Icarus
ER -