Nature, Volume 452Sir Norman Lockyer Macmillan Journals Limited, 2008 - Electronic journals |
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Page 165
... field ? Yes — or at least for a very long time . There are magnetized rocks of all geological ages , going back some 3 billion years . It also seems that the field has always been dipolar , with a north and a south pole ( Fig . 1 ) ...
... field ? Yes — or at least for a very long time . There are magnetized rocks of all geological ages , going back some 3 billion years . It also seems that the field has always been dipolar , with a north and a south pole ( Fig . 1 ) ...
Page 166
... field . As the mag- netic field varies all the time , it is a matter of chance whether a fall in the field ends up with it regrowing with the same or the opposite polarity . This suggests that a reversal is not just a flipping of the ...
... field . As the mag- netic field varies all the time , it is a matter of chance whether a fall in the field ends up with it regrowing with the same or the opposite polarity . This suggests that a reversal is not just a flipping of the ...
Page 167
... field generated by a dynamo model in which heat flow from the core surface matches that estimated from temperature in the solid mantle immediately above it . The four locations of strongest field lie very close to the corresponding ...
... field generated by a dynamo model in which heat flow from the core surface matches that estimated from temperature in the solid mantle immediately above it . The four locations of strongest field lie very close to the corresponding ...
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