Computer Science
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pnas...9914020t&link_type=abstract
Proceedings of the National Academy of Science, vol. 99, Issue 22, p.14020-14025
Computer Science
25
Scientific paper
If relationships exist between the frequency of geomagnetic reversals and the morphology, secular variation, and intensity of Earth's magnetic field, they should be best expressed during superchrons, intervals tens of millions of years long lacking reversals. Here we report paleomagnetic and paleointensity data from lavas of the Cretaceous Normal Polarity Superchron that formed at high latitudes near the tangent cylinder that surrounds the solid inner core. The time-averaged field recorded by these lavas is remarkably strong and stable. When combined with global results available from lower latitudes, these data define a time-averaged field that is overwhelmingly dominated by the axial dipole (octupole components are insignificant). These observations suggest that the basic features of the geomagnetic field are intrinsically related. Superchrons may reflect times when the nature of core-mantle boundary heat flux allows the geodynamo to operate at peak efficiency.
Cottrell Rory D.
Smirnov Alexei V.
Tarduno John A.
No associations
LandOfFree
From the Cover: The Cretaceous superchron geodynamo: Observations near the tangent cylinder does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with From the Cover: The Cretaceous superchron geodynamo: Observations near the tangent cylinder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and From the Cover: The Cretaceous superchron geodynamo: Observations near the tangent cylinder will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1861860