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Infrared Characterization of Jupiter's Equatorial Disturbance Cycle
Author(s) -
Antuñano Arrate,
Fletcher Leigh N.,
Orton Glenn S.,
Melin Henrik,
Rogers John H.,
Harrington Joseph,
Donnelly Padraig T.,
RoweGurney Naomi,
Blake James S. D.
Publication year - 2018
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl080382
Subject(s) - equator , jupiter (rocket family) , infrared , geology , planet , brightness , astronomy , disturbance (geology) , physics , latitude , spacecraft , paleontology
We use an infrared data set captured between 1984 and 2017 using several instruments and observatories to report five rare equatorial disturbances that completely altered the appearance of Jupiter's equatorial zone (EZ): the clearance of tropospheric clouds revealed a new 5‐μm‐bright band encircling the planet at the equator, accompanied by large 5‐μm‐bright filaments. Three events were observed in ground‐based images in 1973, 1979, and 1992. We report and characterize for the first time the entire evolution of two new episodes of this unusual EZ state that presented their maximum 5‐μm‐brightness in December 1999 and February 2007, coinciding with a brown coloration south of the equator and with large bluish filaments and white plumes in the northern EZ at visible wavelengths. We characterize their typical infrared‐bright lifetimes of 12–18 months, with possible periodicities of 6–8 or 13–14 years. We predict that a full‐scale equatorial disturbance could occur in 2019–2021.