...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Icarus: International Journal of Solar System Studies >Multitemporal observations of identical active dust devils on Mars with the High Resolution Stereo Camera (HRSC) and Mars Orbiter Camera (MOC)
【24h】

Multitemporal observations of identical active dust devils on Mars with the High Resolution Stereo Camera (HRSC) and Mars Orbiter Camera (MOC)

机译：高分辨率立体相机（HRSC）和火星轨道相机（MOC）对火星上相同的尘埃活动进行多时间观测

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Active dust devils were observed in Syria Planum in Mars Observer Camera - Wide Angle (MOC-WA) and High Resolution Stereo Camera (HRSC) imagery acquired on the same day with a time delay of ~26. min. The unique operating technique of the HRSC allowed the measurement of the traverse velocities and directions of motion. Large dust devils observed in the HRSC image could be retraced to their counterparts in the earlier acquired MOC-WA image. Minimum lifetimes of three large (avg~700. m in diameter) dust devils are ~26. min, as inferred from retracing. For one of these large dust devil (~820. m in diameter) it was possible to calculate a minimum lifetime of ~74. min based on the measured horizontal speed and the length of its associated dust devil track. The comparison of our minimum lifetimes with previous published results of minimum and average lifetimes of small (~19. m in diameter, avg. min. lifetime of ~2.83. min) and medium (~185. m in diameter, avg. min. lifetime of ~13. min) dust devils imply that larger dust devils on Mars are active for much longer periods of time than smaller ones, as it is the case for terrestrial dust devils. Knowledge of martian dust devil lifetimes is an important parameter for the calculation of dust lifting rates. Estimates of the contribution of large dust devils (>300-1000. m in diameter) indicate that they may contribute, at least regionally, to ~50% of dust entrainment by dust devils into the atmosphere compared to the dust devils <300 m in diameter given that the size-frequency distribution follows a power-law. Although large dust devils occur relatively rarely and the sediment fluxes are probably lower compared to smaller dust devils, their contribution to the background dust opacity by dust devils on Mars could be at least regionally large due to their longer lifetimes and ability of dust lifting into high atmospheric layers.
机译：在同一天获得的火星观察者相机-广角（MOC-WA）和高分辨率立体相机（HRSC）图像中，在叙利亚Planum中观察到活跃的尘土飞逝，延时约〜26。分钟HRSC独特的操作技术可以测量横向速度和运动方向。在HRSC图像中观察到的大尘鬼可以追溯到早期获取的MOC-WA图像中的对应尘埃。三个大尘埃（直径平均约为700.m）的最小寿命为〜26。最小值，由追溯得出。对于其中一个较大的尘埃魔鬼（直径约为820. m），可以计算出约74的最小寿命。 min是根据测得的水平速度及其相关的尘埃魔鬼轨道的长度而定。我们的最小寿命与先前发布的最小和平均寿命的比较（最小（平均直径约为19.m，最小最小寿命为2.83.min）和中等（最小直径约为185.m，平均最小）。生命尘埃的寿命约为13分钟），这意味着火星上较大的尘埃比较小的尘埃活动的时间要长得多，这是陆地尘埃的情况。了解火星尘埃魔鬼的寿命是计算除尘率的重要参数。对大尘埃（直径> 300-1000.m）的贡献的估计表明，相比于<300m的尘埃，它们至少在局部上贡献了尘埃带入大气的约50％。假定尺寸-频率分布遵循幂律，则为直径。尽管大型粉尘很少发生，并且与较小的粉尘相比，沉积物通量可能更低，但由于它们的寿命更长且粉尘升入高空的能力，它们对火星上的粉尘恶魔对背景粉尘不透明性的贡献至少在区域上可能很大。大气层。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号