heliosphere

基本解释

“First and foremost, this is a big surprise because we thought we know a lot about this region, the edge of the heliosphere,” McComas says.
“首先，这太让人吃惊了，因为我们认为对日球层的边缘已经了解的够多的了，”麦科马斯说道。
One possibility is that pressure from this external magnetic field has forced particles just inside the heliosphere to bunch together into a ribbon.
一个可能性就是外部磁场的压力强行把日球层内部的粒子压到了一起，形成了窄带。
The heliosphere shields the solar system from 90 percent of energetic cosmic rays — high-speed charged particles that would otherwise bombard the planets and harm life.
日球层就像一个盾牌，挡住了90%高能宇宙射线。宇宙射线由高速带电粒子组成，会轰击星球并伤害生物。

Measurements from August 25th onwards show a steep drop in the detected volume of cosmic rays from the heliosphere, just as the extrasolar rays are picking up.
ENGADGET: AGU study says Voyager 1 has reached interstellar space, but NASA remains skeptical

the region around the sun outside of which the sun's influence is negligible and interstellar space begins