Earth science: What triggers reversals of the Earth's magnetic field?. Nature 309, 115 (1984). https://doi.org/10.1038/309115a0 Download citation Issue Date10 May 1984 DOIhttps://doi.org/10.1038/309115a0 Springer Nature Limited Share this article Anyone you share the following link with ...
相关知识点: 试题来源: 解析 C。解析:The main function of the earth's magnetic field is to protect the earth from solar winds. The magnetic field does not make the earth look beautiful, attract things to the earth or make the earth spin.反馈 收藏 ...
Deep below the surface of the Earth is the liquid outer core of the planet. This core is composed mostly nickel and iron and rotates independently of the rest of the planet. This spinning ball of iron creates the Earth's magnetic field....
The geodynamo model for the origin of the earth's field is lent further credence by the fact that the moon which turns around its own axis very slowly once in 28 days has a negligible magnetic field. Also, Jupiter which spins much faster than the earth has a very strong mag...
doi:10.1029/EO076i002p00009-03Barton, C. EEos Transactions American Geophysical Union
the lower end of previous estimates of thermal conductivity in Earth’s core—between 18 and 44 watts per meter per kelvin. This translates to estimates about the energy needed to sustain the geodynamo, or magnetic field, that has been available since very early in the history of Earth. ...
This creates a toroidal, or doughnut-shaped field, as the direction of the field propagates outward from the north pole and enters through the south pole. Earth itself is a giant magnet. The planet gets its magnetic field from circulating electric current within the molten metallic core, ...
Earth's magnetic field then redirects the particles toward the north and south poles. The electrically charged particles then enter Earth's atmosphere, exciting gas atoms and molecules and generating auroras. The process is similar to how neon lights work: When the molecules and atoms get "...
Lead and gold share the same weight; only an expert can tell the difference. Although it doesn’t share magnetic properties, lead can interact with magnetic fields by moving a powerful magnet past a leaded piece. Nickel Nickel is also found in the earth’s core, making it popular. It shar...
With a pulsar, the light is most certainly polarized because of the high magnetic field. It would also polarize any vacuums that form around it, and with the VLT light was spotted that sported this change (Baker). Other more Earth-based methods are also in development for detecting signs ...