For the past few centuries, the temporal variation in Earth’s magnetic field in the Pacific region has been anomalously low. The reason for this is tied to large-scale flows in the liquid outer core near the core–mantle boundary, which are weaker under the Pacific and feature a planetary...
from west to east. In the June issue of this Journal2 he continues the same topic and here3 he quotes Professor August Schmidt's views concerning the same object.As the supposition of the Earth's being an electromagnet and being magnetized by an outside primary magnetic field, if verified,...
Guyodo Y and Valet J-P 1999 Global changes in intensity of the Earth’s magnetic field during the past 800 kyr; Nature 399 249–252.↵ Guyodo Y. , Valet J.-P. , 1999 . Global changes in intensity of the Earth's magnetic field during past 800 kyr , Nature , 399 , 249 – ...
Centuries of human observation, as well as the geologic record, show that the Earth's magnetic field changes dramatically in its strength and structure over time. Some 800,000 years ago, a magnetic compass' needle would have pointed south because the Earth's magnetic field was reversed. These ...
A. begun to change in the opposite direction B. been weakening in strength for a long time C. caused the changes on the polarities D. misguided many a man and animal 相关知识点: 试题来源: 解析 B 正确答案:B 解析:文章第一段:《纽约时报》上周报道地球磁场严重减弱开始于150年前。磁场保护...
Now, Noboru Ikeya and Jonathan Woodward at the University of Tokyo have shown that a magnetic field causes chemical changes that can affect cellular behaviour. They achieved this with the aid of a cellular chemical that fluoresces depending on the external magnetic field. When they waved a magne...
The discovery will help scientists further understand Jupiter's interior structure and changes in the Earth's magnetic field. "Secular variation has been on the wish list of planetary scientists for decades," said Scott Bolton, principal investigator for Juno from the Southwest Research Institute in...
Earth'smagnetic fieldacts like a giant invisible bubble that shields the planet from the dangerous cosmic radiation spewing from the sun in the form ofsolar winds. The field exists because Earth has a giant ball of iron at its core surrounded by an outer layer of molten metal. Changes in ...
magnetic field strength that preceded polarity reversal. By modeling the consequences of this increase, they found that the geomagnetic field minimum, when Earth’s magnetic field was estimated to be only ~6% of current levels, triggered substantial changes in atmospheric ozone concentration...
because it produces a magnetic field on one side of the T-maze, while producing no field on the opposite side. Importantly, the studies were carried out in the same laboratory where olfactory conditioning controls were routinely carried out in which flies are trained to associate odours with sug...