卫星观测到太阳系边缘奇异的宇宙“天气”-凯发k8官网

卫星观测到太阳系边缘奇异的宇宙“天气”
文章来源:未知 文章作者:meng 发布时间:2009-10-30 06:41 字体: [ ] 
(单词翻译:双击或拖选)

the first solar system energetic particle maps show an unexpected 1 occurring at the outer edge of the solar wind bubble surrounding the solar system. scientists published these maps, based mostly on data collected from nasa's interstellar boundary explorer satellite, in the oct. 15 issue of science express, the advance online version of the journal science. "nature is full of surprises, and ibex has been lucky to discover one of those surprises," said priscilla frisch, a senior scientist in astronomy(天文学) & astrophysics(天体物理学) at the university of chicago. "the sky maps are dominated by a giant ribbon of energetic neutral atoms(中性原子) extending throughout the sky in an arc(弧度) that is 300 degrees long." energetic neutral atoms form when hot solar wind ions (charged particles) steal electrons from cool interstellar(星际的) neutral atoms.

ibex was launched oct. 19, 2008, to produce the first all-sky maps of the heliosphere(日光层), which reaches far beyond the solar system's most distant planets. extending more than 100 times farther than the distance from earth to the sun, the heliosphere marks the region of outer space subjected to the sun's particle 2.

the new maps show how high-speed cosmic particle streams collide and mix at the edge of the heliosphere, said frisch, who co-authored three of a set of ibex articles appearing in this week's science express. the outgoing solar wind blows at 900,000 miles an hour, crashing into a 60,000-mile-an-hour "breeze" of incoming interstellar gas.

revealed in the ibex data, but not predicted in the theoretical heliosphere simulations of three different research groups, was the ribbon itself, formed where the direction of the interstellar magnetic field draping over the heliosphere is 3 to(垂直于) the viewpoint of the sun.

energetic protons create forces as they move through the magnetic field, and when the protons are bathed in interstellar neutrals, they produce energetic neutral atoms. "we're still trying to understand this unexpected structure, and we believe that the interstellar magnetic forces are associated with the enhanced ena production at the ribbon," frisch said.

ibex shows that energetic neutral atoms are produced toward the north pole of the ecliptic(黄极) (the plane traced by the orbit of the planets around the sun), as well as toward the heliosphere tail 4 toward the 5 of taurus and orion. "the particle energies change between the poles and tail, but surprisingly not in the ribbon compared to adjacent(毗邻的,临近的) locations," frisch said.



点击收听单词发音收听单词发音  

1 j2dxg     
n.陆标,划时代的事,地界标
参考例句:
  • the russian revolution represents a landmark in world history.俄国革命是世界历史上的一个里程碑。
  • the tower was once a landmark for ships.这座塔曾是船只的陆标。
2 1a87f8769eb755734e056efecb5e2da9     
排放物( emission的名词复数 ); 散发物(尤指气体)
参考例句:
  • most scientists accept that climate change is linked to carbon emissions. 大多数科学家都相信气候变化与排放的含碳气体有关。
  • dangerous emissions radiate from plutonium. 危险的辐射物从钚放散出来。
3 gapy0     
adj.垂直的,直立的;n.垂直线,垂直的位置
参考例句:
  • the two lines of bones are set perpendicular to one another.这两排骨头相互垂直。
  • the wall is out of the perpendicular.这墙有些倾斜。
4 il8zb4     
adj.尖的,直截了当的
参考例句:
  • he gave me a very sharp pointed pencil.他给我一支削得非常尖的铅笔。
  • she wished to show mrs.john dashwood by this pointed invitation to her brother.她想通过对达茨伍德夫人提出直截了当的邀请向她的哥哥表示出来。
5 ee34f7988ee4aa80f9502f825177c85d     
n.星座( constellation的名词复数 );一群杰出人物;一系列(相关的想法、事物);一群(相关的人)
参考例句:
  • the map of the heavens showed all the northern constellations. 这份天体图标明了北半部所有的星座。 来自《简明英汉词典》
  • his time was coming, he would move in the constellations of power. 他时来运转,要进入权力中心了。 来自教父部分
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