4.3.5 Geomagnetic field during a polarity transition

2005 ◽  
pp. 222-225
Author(s):  
H. Soffel
Keyword(s):  
Geomagnetic Field ◽  
Polarity Transition

The Sun, geomagnetic polarity transitions, and possible biospheric effects: review and illustrating model

2009 ◽  
Vol 8 (3) ◽  
pp. 147-159 ◽  
Author(s):  
Karl-Heinz Glassmeier ◽  
Otto Richter ◽  
Joachim Vogt ◽  
Petra Möbus ◽  
Antje Schwalb
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Geomagnetic Field ◽  
Solar Wind Plasma ◽  
The Sun ◽  
Solar Origin ◽  
The Earth ◽  
Polarity Transition ◽  
Weak Transition ◽  
Geomagnetic Polarity

AbstractThe Earth is embedded in the solar wind, this ever-streaming extremely tenuous ionized gas emanating from the Sun. It is the geomagnetic field which inhibits the solar wind plasma to directly impinge upon the terrestrial atmosphere. It is also the geomagnetic field which moderates and controls the entry of energetic particles of cosmic and solar origin into the atmosphere. During geomagnetic polarity transitions the terrestrial magnetic field decays down to about 10% of its current value. Also, the magnetic field topology changes from a dipole dominated structure to a multipole dominated topology. What happens to the Earth system during such a polarity transition, that is, during episodes of a weak transition field? Which modifications of the configuration of the terrestrial magnetosphere can be expected? Is there any influence on the atmosphere from the intensified particle bombardment? What are the possible effects on the biosphere? Is a polarity transition another example of a cosmic cataclysm? A review is provided on the current understanding of the problem. A first, illustrating model is also discussed to outline the complexity of any biospheric reaction on polarity transitions.

scholarly journals Brunhes-Matuyama polarity transition in three deep-sea sediment cores

1982 ◽  
Vol 306 (1492) ◽  
pp. 113-119 ◽  
Keyword(s):  
Deep Sea ◽  
Geomagnetic Field ◽  
Close Agreement ◽  
Sediment Cores ◽  
Equatorial Pacific Ocean ◽  
Deep Sea Sediment ◽  
Polarity Transition ◽  
Directional Change ◽  
Notable Increase ◽  
Considerable Detail

The Brunhes-Matuyama polarity transition was studied in three deep-sea sediment cores obtained from the mid-northern and equatorial Pacific Ocean. Rates of sedimentation vary from 0.7 to 1.1 cm k a -1 . The cores were sampled across the transition in 4 mm slices, and each level was further subdivided into three specimens. Inclinations above and below the transition interval are in close agreement with that of an axial dipole field. Estimates of transition duration based on directional change range from 4900 to 8500 years. The transition can be described by a longitudinally confined portion in each of the v.g.p. paths, but is complicated by broad loops in all three records. While fine-scale sampling reveals considerable detail, the notable increase in within-level dispersion observed in the transition and the apparent differences in v.g.p. paths in nearby cores from the same region indicate that factors other than the geomagnetic field may contribute to these transition records.

Models of the geomagnetic field and characteristics of magnetic storms

2006 ◽  
Vol 12 (1) ◽  
pp. 64-69
Author(s):  
O.I. Maksimenko ◽  
◽  
L.N. Yaremenko ◽  
O.Ya. Shenderovskaya ◽  
G.V. Melnyk ◽  
...  
Keyword(s):  
Geomagnetic Field ◽  
Magnetic Storms
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