Paleomagnetic intensity data: a window on the dynamics of Earth's fluid core?

Details Paleomagnetic intensity data: a window on the dynamics of Earth's fluid core? Paleomagnetic intensity data: a window on the dynamics of Earth's fluid core?

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pepi..140...91a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 140, Issue 1-3, p. 91-100.

Physics

5

Paleomagnetic Intensity, Parametric Instability, Earth'S Core, Geodynamo

Scientific paper

We consider paleomagnetic intensity data obtained from sedimentary cores as a time sequence related to fluctuations of the fluid velocity in Earth's core. Although this is a gross oversimplification of the relationship between the geomagnetic and velocity fields, some aspects of their possible interaction might be obtained through inversion of paleomagnetic intensity data. In particular, a signature for the onset and development of turbulence as seen in laboratory experiments on rotational parametric instabilities in rotating fluids, may be contained in a paleointensity time sequence. Just as in laboratory experiments, changes in flow regimes can be traced using these observations. The paleomagnetic intensity itself is subject to several factors which contribute to uncertainty including the determination of the intensity as well as errors in timing due to offsets in age determination.
Non-linear inversions of several records from the ODP 983 data set of paleomagnetic amplitudes are presented. Growth and decay with time of paleomagnetic amplitudes are modelled as the sum of an exponential plus two harmonics. This simple model accounts for most of the paleomagnetic amplitude signal, yielding geophysically plausible growth and decay rates for a proposed rotational parametric instability in Earth's core. This model provides a new interpretation for observed paleomagnetic intensity changes and thus, an improved understanding of the dynamical processes producing the geomagnetic field.

Affiliated with

Also associated with

No associations

Rating

Paleomagnetic intensity data: a window on the dynamics of Earth's fluid core? 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 Paleomagnetic intensity data: a window on the dynamics of Earth's fluid core?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Paleomagnetic intensity data: a window on the dynamics of Earth's fluid core? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1767255