You are here

Low-energy secondary electrons play a crucial role in creating pulsating auroras

Editage Insights | 2015年10月8日 | 2,557 浏览次数
Electrons and pulsating auroras

A team of researchers from NASA's Goddard Space Flight Center in Greenbelt, Maryland, discovered evidence for an unanticipated role of electrons in creating the pulsating auroras. The unique feature of pulsating auroras is that they shift and brighten in distinct patches unlike active auroras that create elongated arcs across the sky. The team comparing ground-based videos of pulsating auroras with satellite measurements of electrons that fall from Earth’s magnetosphere to the Earth's upper atmosphere. Although electrons cause auroras, it has been assumed that low-energy secondary electrons had no part to play in pulsating auroras. However, the team observed that these secondary electrons “are sent spinning to the surface by complicated wave motions in the magnetosphere” which then creates pulsating auroras. Marilia Samara, the lead author of the study, says, “It turns out that secondary electrons could very well be a big piece of the puzzle to how, why, and when the energy that creates auroras is transferred to the upper atmosphere.”

Read more in Science Daily.


《意得辑专家视点》深信知识需要开放给所有大众并传播,因此我们鼓励读者重复发表我们的内容,重复发表形式可为在线或印刷。我们采用知识共享(Creative Commons license),只要您遵守以下事项,即可免费重复发表我们的内容:
  • 作者信息:请尊重我们的作者,他们花费了时间精力为您撰写这些有价值的内容,重复发表时加注作者信息。
  • 意得辑专家视点:必须注明文章出自《意得辑专家视点》。
  • 表达您的情意:您可以加句“前往《意得辑专家视点》阅读全文”之类的话,啊,还有,别忘了加上文章链接。
  • 重复使用图片:要使用某些文章的图片必须事先取得许可,并加注图片原始出处。
  • 镶嵌代码:要重复使用这篇文章最简单的方式就是将下面的代码复制贴上您的页面!