Results 91 to 100 of about 153 (126)

Avian magnetic compass can be tuned to anomalously low magnetic intensities. [PDF]

Proc Biol Sci, 2013
Winklhofer M, Dylda E, Thalau P, Wiltschko W, Wiltschko R.   +4 more
europepmc   +1 more source

Age-dependent extinction and the neutral theory of biodiversity. [PDF]

Proc Natl Acad Sci U S A
Saulsbury JG, Parins-Fukuchi CT, Wilson CJ, Reitan T, Liow LH.   +4 more
europepmc   +1 more source

Magnetostratigraphic resolution of the late Ediacaran paleomagnetic enigma

Pierce J, Evans D, Polomski D, Youbi N, Mediany M, Ounar J, Oukhro R, Boumehdi MA, Strauss J, Keller CB, Gärtner A, Ovtcharova M, Wotzlaw J, Linnemann U.   +13 more
europepmc   +1 more source

The distinction between geomagnetic excursions and reversals [PDF]

Geophysical Journal International, 1999
SUMMARY Two recent studies of the geomagnetic ¢eld in the last 1 Myr have found 14 excursions, large changes in direction lasting 5^10 kyr each, six of which are established as global phenomena by correlation between diierent sites. The older picture of the geomagnetic ¢eld enjoying long periods of stable polarity may not therefore be correct; instead,
David Gubbins, Gubbins David
exaly   +3 more sources

Toroidal flux oscillation as possible cause of geomagnetic excursions and reversals [PDF]

Physics of the Earth and Planetary Interiors, 2008
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F H Busse, Radostin D Simitev
exaly   +5 more sources

Simulations of a time-varying non-dipole field during geomagnetic reversals and excursions

Physics of the Earth and Planetary Interiors, 2008
Abstract Following Brown et al (2007) reversals and excursions have been simulated by decreasing the axial dipole field to zero while leaving up a time-varying non-dipolar field similar to the CAL7K model [Korte, M., Constable, C.G., 2005. Continuous geomagnetic models for the past 7 millennia II: CALS7K. Geochem. Geophys. Geosyst.
Jean-Pierre Valet
exaly   +3 more sources

An activity index for geomagnetic paleosecular variation, excursions, and reversals [PDF]

Geochemistry, Geophysics, Geosystems, 2017
AbstractMagnetic indices provide quantitative measures of space weather phenomena that are widely used by researchers in geomagnetism. We introduce an index focused on the internally generated field that can be used to evaluate long term variations or climatology of modern and paleomagnetic secular variation, including geomagnetic excursions, polarity ...
Sanja Panovska, C G Constable
exaly   +4 more sources

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Geomagnetic field intensity, excursions, reversals and the 41,000-yr obliquity signal

Earth and Planetary Science Letters, 2006
Abstract The possibility that precession provides power to the geodynamo has been tested by comparing variations in field intensity and the occurrence of excursions and reversals with the obliquity signal. The strongest minima in the paleomagnetic intensity records for the past 800,000 yr correlate with obliquity minima.
M Fuller
exaly   +2 more sources

Geomagnetic reversals and excursions: Their paleomagnetic record and implications for the geodynamo

Reviews of Geophysics, 1983
Since the earliest reports of paleomagnetic evidence in support of the existence of geomagnetic field reversals, much attention has been focused on understanding the relevant core mechanism. Given the far‐reaching implications such an understanding would have on the whole of geomagnetism, past investigations of this phenomenon have involved ...
Kenneth A Hoffman
exaly   +2 more sources

Weather at the core: defining and categorizing geomagnetic excursions and reversals [PDF]

Geophysical Journal International
SUMMARY Paleomagnetic records provide us with information about the extreme geomagnetic events known as excursions and reversals, but the sparsity of available data limits detailed knowledge of the process and timing. To date there are no agreed on criteria for categorizing such events in terms of severity or longevity.
C G Constable, Matthias Morzfeld
exaly   +3 more sources