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arXiv 2302.04689astro-ph.EPphysics.ao-ph
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2022年金星云间断

The Venus' Cloud Discontinuity in 2022

J. Peralta, A. Cidadão, L. Morrone, C. Foster, M. Bullock, E. F. Young, I. Garate-Lopez, A. Sánchez-Lavega, T. Horinouchi, T. Imamura, E. Kardasis, A. Yamazaki, S. Watanabe

摘要:

JAXA的Akatsuki任务于2016年首次发现,不连续/中断是一种经常性的波,在金星的深层云层中传播了几十年(距地面47- 56公里),当它不在云端时($\sim$ 70公里)表明,它消散在上层云层,并通过波-平均流相互作用利用自2021年12月至2022年7月与Akatsuki任务协调进行的地面观测活动,我们的目标是对云不连续性进行迄今为止最长时间的不间断监测,以获得其主要特性的开创性长期特征,并更好地限制其复发和寿命。分别用Akatsuki/UVI、业余观测者和NASA的IRTF/SpeX获得的具有适当滤波器的图像研究了昼侧的上层、中层和夜侧的下层云。数百张图像被检查,以寻找不连续事件的表现形式,并测量其尺寸,方向或旋转周期等关键属性。在109天的时间里,我们成功地跟踪了中间云层的间断。不连续性的性质与2016年和2020年的测量结果几乎相同,方向为$91^{\circ}\pm 8^{\circ}$,长度/宽度为$4100\pm 800$ / $500\pm 100$ km,旋转周期为$5.11\pm 0.09$天。2022年6月13日至14日期间的紫外线图像表明,由于纬向风较慢,该波的临界水平发生了高度变化,因此在$\sim$ 21小时期间,云层顶部可能出现了不连续性。

英文摘要:

First identified in 2016 by JAXA's Akatsuki mission, the discontinuity/disruption is a recurrent wave observed to propagate during decades at the deeper clouds of Venus (47--56 km above the surface), while its absence at the clouds' top ($\sim$70 km) suggests that it dissipates at the upper clouds and contributes in the maintenance of the puzzling atmospheric superrotation of Venus through wave-mean flow interaction. Taking advantage of the campaign of ground-based observations undertaken in coordination with the Akatsuki mission since December 2021 until July 2022, we aimed to undertake the longest uninterrupted monitoring of the cloud discontinuity up to date to obtain a pioneering long-term characterization of its main properties and better constrain its recurrence and lifetime. The dayside upper, middle and nightside lower clouds were studied with images with suitable filters acquired by Akatsuki/UVI, amateur observers and NASA's IRTF/SpeX, respectively. Hundreds of images were inspected in search of manifestations of the discontinuity events and to measure key properties like its dimensions, orientation or rotation period. We succeeded in tracking the discontinuity at the middle clouds during 109 days without interruption. The discontinuity exhibited properties nearly identical to measurements in 2016 and 2020, with an orientation of $91^{\circ}\pm 8^{\circ}$, length/width of $4100\pm 800$ / $500\pm 100$ km and a rotation period of $5.11\pm 0.09$ days. Ultraviolet images during 13-14 June 2022 suggest that the discontinuity may have manifested at the top of the clouds during $\sim$21 hours as a result of an altitude change in the critical level for this wave due to slower zonal winds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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