First direct measurement of auroral and equatorial jets in the stratosphere of Jupiter
First direct measurement of auroral and equatorial jets in the stratosphere of Jupiter
复制标题
首次直接测量木星平流层的极光和赤道急流
DOI：
--
复制
发表时间：
2021
影响因子：
6.5
通讯作者：
C. Jarchow
中科院分区：
文献类型：
--
作者：
T. Cavali'e;B. Benmahi;V. Hue;R. Moreno;E. Lellouch;T. Fouchet;P. Hartogh;L. Rezac;T. Greathouse;G. Gladstone;J. Sinclair;M. Dobrijevic;F. Billebaud;C. Jarchow
上下文。木星的对流层风模式由交替的前进和逆行纬向喷流组成，赤道周围的典型速度可达100 m s - 1。在更高的高度，在电离层，已经发现了速度为1 - 2 km s - 1的强极光喷流。在地球的平流层中没有这样的直接测量方法。
Context. The tropospheric wind pattern in Jupiter consists of alternating prograde and retrograde zonal jets with typical velocities of up to 100 m s−1 around the equator. At much higher altitudes, in the ionosphere, strong auroral jets have been discovered with velocities of 1−2 km s−1. There is no such direct measurement in the stratosphere of the planet.
Aims. In this Letter, we bridge the altitude gap between these measurements by directly measuring the wind speeds in Jupiter’s stratosphere.
Methods. We use the Atacama Large Millimeter/submillimeter Array’s very high spectral and angular resolution imaging of the stratosphere of Jupiter to retrieve the wind speeds as a function of latitude by fitting the Doppler shifts induced by the winds on the spectral lines.
Results. We detect, for the first time, equatorial zonal jets that reside at 1 mbar, that is, above the altitudes where Jupiter’s quasi-quadrennial oscillation occurs. Most noticeably, we find 300−400 m s−1 nonzonal winds at 0.1 mbar over the polar regions underneath the main auroral ovals. They are in counterrotation and lie several hundred kilometers below the ionospheric auroral winds. We suspect them to be the lower tail of the ionospheric auroral winds.
Conclusions. We directly detect, for the first time, strong winds in Jupiter’s stratosphere. They are zonal at low-to-mid latitudes and nonzonal at polar latitudes. The wind system found at polar latitudes may help increase the efficiency of chemical complexification by confining the photochemical products in a region of large energetic electron precipitation.
第一张 ALMA 毫米波长木星图，并对对流进行多波长研究
DOI：
10.3847/1538-3881/ab3643
发表时间：
2019
期刊：
The Astronomical Journal
影响因子：
--
作者：
De Pater I
通讯作者：
De Pater I