Messenger will explore the surface of Mercury, its crust, its atmosphere and even its magnetic field.

“信使号”将探索水星的表面、地壳、大气，甚至其磁场。

Geomagnetic activity, the natural variations in Earth's magnetic field, it fluctuates in 11-year cycles.

地磁活动是地球磁场的自然变化，其波动周期为11年。

At the Earth's surface, these tempests can be detected by changes in the strength of the Earth's magnetic field.

在地球表面，可以通过改变地球磁场强度来检测这些风暴。

When the magnetic field is at its strongest, and sunspots at their most plentiful, they cluster close to the equator.

当磁场最强，太阳黑子最丰富的时候，它们会聚集在赤道附近。

This metallic core gives Earth its characteristic magnetic field, which has played an extremely important role in the history of our planet.

这种金属核赋予地球特有的磁场，在地球的历史上发挥了极其重要的作用。

In 1832, the year of Michael Faraday's discovery that a changing magnetic field produces an electric field, a young French engineer patented a new and more efficient waterwheel.

1832年，也就是迈克尔·法拉第发现磁场变化会产生电场的那一年，一位年轻的法国工程师为一种新的、效率更高的水车申请了专利。

The Earth's magnetic field is generated as the molten iron of the Earth's outer core revolves around its solid inner core; when surges in the molten iron occur, magnetic tempests are created.

地球磁场是由地球外核的熔铁围绕固体内核旋转而产生的；当铁水激增，就会发生磁暴。

HOW does the Earth's magnetic field originate?

地球的磁场如何产生？

Spin any electric charge and you get a magnetic field.

当你把任意电荷旋转起来，就能得到磁场。

The plasma flows in a loop along a magnetic field line.

这些等离子体沿着磁力线的方向流动喷发。

FMRI USES a magnetic field to measure blood flow in the brain.

磁共振成像是使用磁场来测量大脑的血流量。

The tesla is the unit that defines magnetic field strength.

即一万亿分之一特斯拉，特斯拉是磁感应强度的计量单位。

Up until now we've waited until we see the magnetic field erupting.

目前，我们一直在等待太阳磁场的爆发。

Yet another longstanding mystery is why Mercury has a magnetic field.

另一个悬而未决的谜团是为什么水星上有磁场。

It is because a conductor carrying is surrounded by a magnetic field.

这就是因为载流导体周围有一磁场。

At the end of a cycle, the magnetic field rapidly reverses its polarity.

在周期的最后，磁场的两极快速翻转。

The bands are thought to play a role ingenerating the sun's magnetic field.

据信，这些物质流在太阳产生磁场过程中起着重要作用。

The interplanetary magnetic field fluctuates greatly in magnitude and direction.

行星际磁场在不同的星等和方向强度差别很大。

The Earth's magnetic field is generated by currents flowing in Earth's outer core.

地球磁场由地球外核中的电流产生。

The red threadlike filaments are composed of cool gas suspended by a magnetic field.

红色细长的丝状体是由冷却下来的气体组成，气体处于磁场中。

Further imagine that this pipe is not made of metal but a transparent magnetic field.

接着再想象一下，这样的管道不是用金属做的，而是一个透明的磁场。

As on Earth, the particles are channelled to the poles by the planet's magnetic field.

在地球，原子内粒子在地球磁场的作用下呈流状分布在两极。

The most plausible explanation involves electrical currents along the magnetic field lines.

最合理的解释涉及到沿着磁场线的电流。

These electrons have a property called spin which may be sensitive to Earth's magnetic field.

这些电子有着自旋特性，可能对地球磁场具有敏感性。

Mars has no magnetic field, so the surface is constantly bombarded by radiation from the sun.

火星没有地磁场，因此地表经常遭受太阳辐射的袭击。

They also suspect a fluid outer core generates the planet's magnetic field though convection.

他们还怀疑流体外核产生的磁场领域通过对流。

Astronomers believe the star's magnetic field caused the outburst, but do not understand how.

天文学家认为，这种星球的磁场导致了爆炸的发生，但是，他们不明白是如何发生的。

Solar flares send out bursts of electromagnetic energy that strike the Earth's magnetic field.

耀斑的爆发将产生大量的粒子，粒子流将挟带大量能量轰击地球磁场。

Scientists originally thought a similar process may have generated an early lunar magnetic field.

科学家原本认为，早起的月球磁场是由一个相似的过程引起的。