外语原版纪录片《 Magnetic Storm 》 - 纪录片1080P/720P/360P高清标清网盘迅雷下载

我爱学外语

外语原版纪录片《 Magnetic Storm 》 - 纪录片1080P/720P/360P高清标清网盘迅雷下载

Magnetic Storm






纪录片关键词：


Magnetic Storm,Doomsday: 10 Ways the World Will End,Earth's Force Field,Electronic Armageddon,Magnetism,Message in the Rocks,The Earth's Core,The Merry Dancers,The Sunspot Mystery,When North Goes South,JumpinS

Science,Gene Galousha,PBS,PBS Nova,2003,English


纪录片内容简介：

General Information：
Science Documentary hosted by Gene Galousha and published by PBS broadcasted as part of PBS Nova series in 2003- English narration

Information
Like the plot of a sci-fi B movie, something weird is happening deep
underground where the constant spin of Earth's liquid metallic core generates
an invisible magnetic force field that shields our planet from harmful
radiation in space. Gradually, the field is growing weaker. Could we be heading
for a demagnetized doomsday that will leave us defenceless against the lethal
effects of solar wind and cosmic rays? "Magnetic Storm" looks into our
potentially unsettling magnetic future.
Scientists studying the problem are looking everywhere from Mars, which
suffered a magnetic crisis four billion years ago and has been devoid of a
magnetic field, an appreciable atmosphere, and possibly life ever since, to a
laboratory at the University of Maryland, where a team headed by physicist Dan
Lathrop has re-created the molten iron dynamo at Earth's core by using 240
pounds of highly explosive molten sodium. The most visible signs of Earth's
magnetic field are auroras, which are caused by charged particles from space
interacting with the atmosphere as they flow into the north and south magnetic
poles.
At the present rate, Earth's magnetic field could be gone within a few
centuries, exposing the planet to the relentless blast of charged particles
from space with unpredictable consequences for the atmosphere and life. Other
possibilities: the field could stop weakening and begin to strengthen, or it
could weaken to the point that it suddenly flips polarity-that is, compasses
begin to point to the South Magnetic Pole.
Such a reversal of polarity seems to happen every 250,000 years on average,
making us long overdue for another swap between the north and south magnetic
poles. Scientist Gary Glatzmaier of the University of California at Santa Cruz
has actually observed such reversals, as they occur in computer simulations.
These virtual events show striking similarities to the current behavior of
Earth's magnetic field and suggest we are about to experience another reversal,
though it will take centuries to unfold. Some researchers believe we are
already in the transition phase, with growing areas of magnetic anomaly-where
field lines are moving the wrong way-signaling an ever weaker and chaotic state
for our protective shield.
Geophysicist Rob Coe, also of the University of California at Santa Cruz, may
have even found a lava record in Oregon that charts the magnetic mayhem that
ensues during a period of reversal. The picture that emerges may not be up to
Hollywood disaster standards, but considering that human civilization has never
had to cope with such a situation before, it could be an interesting and
challenging time


Technical Specs
Video Codec: DivX5
Video Bitrate: 1594 kbps
Video Resolution: 640*384
Video Aspect Ratio: 16:9
Audio Codec: AC3
Audio BitRate: 192 kbps
Audio Channels: 2
RunTime Per Part: 53:47
Number Of Parts: 1
Part Size: 687 MB
Ripped by HankEvans

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

外语原版纪录片《 Magnetic Storm 》 - 纪录片1080P/720P/360P高清标清网盘迅雷下载

下载地址：
（本链接可能为BT下载方式，需自备BT类下载工具。推荐使用115网盘离线下载，或使用其他具有离线下载功能的网盘）

游客
文件下载链接就在这里，在您回复评论成功后才能显示。
请勿回复无意义的灌水内容。

下拉页面到最底部回复或者【点击此处快捷回复】，回复后返回此处即可查看下载链接。
如您没注册本站会员，可以点击注册本站，注册后即可回复下载。

p916244p5x

好东西必须支持