Abstract：
:The Earth's equatorial stratosphere shows oscillations in which the east-west winds reverse direction and the temperatures change cyclically with a period of about two years. This phenomenon, called the quasi-biennial oscillation, also affects the dynamics of the mid- and high-latitude stratosphere and weather in the lower atmosphere. Ground-based observations have suggested that similar temperature oscillations (with a 4-5-yr cycle) occur on Jupiter, but these data suffer from poor vertical resolution and Jupiter's stratospheric wind velocities have not yet been determined. Here we report maps of temperatures and winds with high spatial resolution, obtained from spacecraft measurements of infrared spectra of Jupiter's stratosphere. We find an intense, high-altitude equatorial jet with a speed of approximately 140 m s(-1), whose spatial structure resembles that of a quasi-quadrennial oscillation. Wave activity in the stratosphere also appears analogous to that occurring on Earth. A strong interaction between Jupiter and its plasma environment produces hot spots in its upper atmosphere and stratosphere near its poles, and the temperature maps define the penetration of the hot spots into the stratosphere.
journal_name
Naturejournal_title
Natureauthors
Flasar FM,Kunde VG,Achterberg RK,Conrath BJ,Simon-Miller AA,Nixon CA,Gierasch PJ,Romani PN,Bézard B,Irwin P,Bjoraker GL,Brasunas JC,Jennings DE,Pearl JC,Smith MD,Orton GS,Spilker LJ,Carlson R,Calcutt SB,Read PL,Tadoi
10.1038/nature02142keywords:
subject
Has Abstractpub_date
2004-01-08 00:00:00pages
132-5issue
6970eissn
0028-0836issn
1476-4687pii
nature02142journal_volume
427pub_type
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