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地球上哪里的磁场强度更强?

地球上是否有除了南北极以外的强磁场?

回答

如果我们只考虑自然资源产生的磁场，而不考虑人类活动产生的磁场。总的趋势是，在靠近磁极的地方，磁场强度更高。然而，这只是一个大趋势。南半球经历了最高的磁场强度，达到65,000 nT以上，这个南部的最大值与南磁极相当匹配。相比之下，在北半球，最大的活动发生在西伯利亚，离北磁极(目前非常接近地理北极)很远。地球磁场有很多模型。你可以在[geomag.org][2]上找到一个全面的列表。你可以找到[NOAA的世界边际模型]2015年的强度输出[3]，[这里][4]。具有等高线的形状文件可用于2018年[这里][5](以及更多的地图)，而由WMM模型计算的北极和南极的坐标可用于[这里][6]。把2018年的所有信息放在一起，地图看起来是这样的[![enter image description here][7]][7] The contour interval is 1000 nT, grid lines interval is 10°, and the green dots represent the south and north magnetic poles. The maximum intensity contour in the northern hemisphere happens in Siberia with a value of 61,000 nT and the center of the contour is located roughly 3,100 km away from the magnetic north pole. The maximum intensity contour in the southern hemisphere is between Australia and Antarctica, with a value of 67,000 nT and the center of the contour is located roughly 450 km away from the magnetic south pole. So the answer is: **Yes, there are. Maximum field intensity doesn't happen at the magnetic poles. Specially in the Northern hemisphere, the maximum intensity happens in Siberia, a few thousand kilometers away from the magnetic pole. The maximum intensity globally according to NOAA's WMM model is located in the southern hemisphere, approximately at 60° 15' S, 135° 52' E, about 450 km away from the south magnetic pole** The projection in the map above (geographic) generates a big distortion of the distances, the images below show the same information in polar stereographic projection: [![enter image description here][8]][8] Now, it is worth adding that the above information wouldn't be significantly modified if you consider natural magnetic anomalies due to magnetic crustal deposits. This is because magnetic anomalies are usually smaller than a few hundred nT, therefore the magnetic field intensity pattern is largely controlled by the internal magnetic field. Magnetic anomalies are not mapped over the whole world, but the [World Digital Magnetic Anomaly Map][9], provides a pretty good estimate [![enter image description here][10]][10] However, these anomalies are measured at an altitude of 5 km above mean sea level, and have a resolution of 3-arc-minute resolution (~5 km). Therefore, it doesn't rule out the existence of very strong and localized small scale anomalies, that might lead to large variations on the magnetic field intensity but over a very small area. The maximum value within the World Digital Magnetic Anomaly Map dataset is 8570.78 nT, but even considering all anomalies, the largest field intensities remain within the same contour near the magnetic south pole. [1]: https://en.wikipedia.org/wiki/Earth%27s_magnetic_field [2]: http://geomag.org/models/index.html [3]: https://ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml [4]: https://ngdc.noaa.gov/geomag/WMM/data/WMM2015/WMM2015_F_MERC.pdf [5]: https://ngdc.noaa.gov/geomag/WMM/image.shtml [6]: https://www.ngdc.noaa.gov/geomag/GeomagneticPoles.shtml [7]: https://i.stack.imgur.com/dVdvt.jpg [8]: https://i.stack.imgur.com/U73Iz.jpg [9]: http://geomag.org/models/wdmam.html [10]: https://i.stack.imgur.com/wCB5v.jpg

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\ begingroup美元非常好的答案，有没有一个地方有很强的专注领域? \ endgroup美元
- - - - - -Muze
2018年4月11日2:06
1

\ begingroup美元 @Muze你说的“强烈专注”是什么意思??是绝对意义上的强，还是相对于邻近地区的强? \ endgroup美元
- - - - - -卡米洛·Rada
2018年4月11日2:15
\ begingroup美元比如百慕大三角之类的。 \ endgroup美元
- - - - - -Muze
2018年4月11日2:23
5

\ begingroup美元不，没有。就像我说的，可能会有一些非常小的东西，绝对没有百慕大三角那么大。 \ endgroup美元
- - - - - -卡米洛·Rada
2018年4月11日2:36
7

\ begingroup美元 @Muze听起来你对磁异常感兴趣。但是评论不是讨论这个的好地方。在这方面你应该提出一个更具体的新问题。 \ endgroup美元
- - - - - -卡米洛·Rada
2018年4月11日3:49

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使用反撇号'或波浪号~创建代码围栏
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像这样
' ' '
添加语言标识符以突出显示代码
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def函数(foo):
打印(foo)
' ' '
在段落之间放置返回
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_italic_或* *的* *
通过将>放在行开始来引用
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