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Two‐Year Observations of the Jupiter Polar Regions by JIRAM on Board Juno
Author(s) -
Adriani A.,
Bracco A.,
Grassi D.,
Moriconi M. L.,
Mura A.,
Orton G.,
Altieri F.,
Ingersoll A.,
Atreya S. K.,
Lunine J. I.,
Migliorini A.,
Noschese R.,
Cicchetti A.,
Sordini R.,
Tosi F.,
Sindoni G.,
Plainaki C.,
Dinelli B. M.,
Turrini D.,
Filacchione G.,
Piccioni G.,
Bolton S. J.
Publication year - 2020
Publication title -
journal of geophysical research: planets
Language(s) - English
Resource type - Journals
eISSN - 2169-9100
pISSN - 2169-9097
DOI - 10.1029/2019je006098
Subject(s) - jovian , jupiter (rocket family) , polar , atmosphere of jupiter , anticyclone , atmosphere (unit) , polar vortex , polar cap , atmospheric sciences , geology , latitude , astrobiology , environmental science , physics , astronomy , meteorology , planet , saturn , space shuttle
We observed the evolution of Jupiter's polar cyclonic structures over two years between February 2017 and February 2019, using polar observations by the Jovian InfraRed Auroral Mapper, JIRAM, on the Juno mission. Images and spectra were collected by the instrument in the 5‐μm wavelength range. The images were used to monitor the development of the cyclonic and anticyclonic structures at latitudes higher than 80° both in the northern and the southern hemispheres. Spectroscopic measurements were then used to monitor the abundances of the minor atmospheric constituents water vapor, ammonia, phosphine, and germane in the polar regions, where the atmospheric optical depth is less than 1. Finally, we performed a comparative analysis with oceanic cyclones on Earth in an attempt to explain the spectral characteristics of the cyclonic structures we observe in Jupiter's polar atmosphere.