首页> 外文期刊>Planetary and space science >Lunar energetic neutral atom (ENA) spectra measured by the interstellar boundary explorer (IBEX)
【24h】

Lunar energetic neutral atom (ENA) spectra measured by the interstellar boundary explorer (IBEX)

机译:星际边界探测器(IBEX)测量的月球高能中性原子(ENA)光谱

获取原文
获取原文并翻译 | 示例
           

摘要

The solar wind continuously flows out from the Sun, filling interplanetary space and directly interacting with the surfaces of small planetary bodies and other objects throughout the solar system. A significant fraction of these ions backscatter from the surface as energetic neutral atoms (ENAs). The first observations of these ENA emissions from the Moon were recently reported from the Interstellar Boundary Explorer (IBEX). These observations yielded a lunar ENA albedo of ~10% and showed that the Moon reflects ~150 metric tons of neutral hydrogen per year. More recently, a survey of the first 2.5 years of IBEX observations of lunar ENAs was conducted for times when the Moon was in the solar wind. Here, we present the first IBEX ENA observations when the Moon is inside the terrestrial magnetosheath and compare them with observations when the Moon is in the solar wind. Our analysis shows that: (1) the ENA intensities are on average higher when the Moon is in the magnetosheath, (2) the energy spectra are similar above ~ 0.6~* solar wind energy but below there are large differences of the order of a factor of 10, (3) the energy spectra resemble a power law with a "hump" at ~0.6 ~* solar wind energy, and (4) this "hump" is broader when the Moon is in the magnetosheath. We explore potential scenarios to explain the differences, namely the effects of the topography of the lunar surface and the consequences of a very different Mach number in the solar wind versus in the magnetosheath.
机译:太阳风不断从太阳流出,充满行星际空间,并与整个太阳系中的小行星体和其他物体的表面直接相互作用。这些离子的很大一部分作为高能中性原子(ENA)从表面反向散射。星际边界探测器(IBEX)最近报道了月球上这些ENA排放的首次观测结果。这些观测结果得出月球ENA的反照率约为10%,表明月球每年反射的中性氢约为150公吨。最近,当月球在太阳风中时,对IBEX对月球ENA观测的前2.5年进行了一次调查。在这里,我们展示了当月球位于地球磁层内时的第一个IBEX ENA观测结果,并将它们与月球在太阳风中时的观测结果进行了比较。我们的分析表明:(1)当月球处于磁石场时,ENA强度平均较高;(2)〜0.6〜*太阳风能以上的能量谱相似,但在以下范围内的能量谱相差很大系数为10时,(3)能谱类似于幂律,太阳风能约为0.6〜*时具有“驼峰”,(4)当月球处于磁层时,这种“驼峰”更宽。我们探索潜在的情景来解释差异,即月球表面地形的影响以及太阳风与磁石场中马赫数非常不同的结果。

著录项

  • 来源
    《Planetary and space science》 |2013年第9期|232-242|共11页
  • 作者单位

    Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78228, USA,University of Texas at San Antonio, Physics and Astronomy Department, San Antonio, TX 78249, USA;

    Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78228, USA;

    Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78228, USA,University of Texas at San Antonio, Physics and Astronomy Department, San Antonio, TX 78249, USA;

    Los Alamos National Laboratory, Los Alamos, Bikini Atoll Rd., SM 30, NM 87545, USA;

    Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78228, USA;

    University of Montana, 32 Campus Drive, Missoula, MT, USA;

    Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78228, USA,University of Texas at San Antonio, Physics and Astronomy Department, San Antonio, TX 78249, USA;

    University of New Hampshire, Space Science Center, Physics and Astronomy Department, Morse Hall Room 407, Durham, NH 03824, USA;

    University of Montana, 32 Campus Drive, Missoula, MT, USA;

    Physikalisches Institut, Universitat Bern, Sidlerstrasse 5, 3012 Bern, Switzerland;

    University of New Hampshire, Space Science Center, Physics and Astronomy Department, Morse Hall Room 407, Durham, NH 03824, USA;

    Physikalisches Institut, Universitat Bern, Sidlerstrasse 5, 3012 Bern, Switzerland;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Energetic neutral atoms; ENA Moon albedo; Solar wind; IBEX;

    机译:高能中性原子;ENA月亮反照率;太阳风;IBEX;

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