A three-dimensional self-consistent computer simulation of a geomagnetic field reversal in Nature 377, No. 6546, 21 September 1995, pp. 203-209 [SELF-CONSISTENT DYNAMO MODELS INTERIOR OF EARTH]. Gary Glatzmaier, Paul Roberts.

A three-dimensional self-consistent computer simulation of a geomagnetic field reversal in Nature 377, No. 6546, 21 September 1995, pp. 203-209 [SELF-CONSISTENT DYNAMO MODELS INTERIOR OF EARTH]

London: 1995. 1st Edition. FIRST EDITION IN ORIGINAL WRAPS OF ONE OF THE FIRST SELF-CONSISTENT DYNAMO MODELS TO GRAPHICALLY PRESENT THE DYNAMICS OF THE INTERIOR OF THE EARTH. The important computer generated graphics that Glatzmaier and Roberts derived from the computer model they created – graphics presented in this paper -- are among the most famous in the field. Their model was the first to “successfully reproduce the intensity of Earth’s field, its dipole character… its present westward drift” and the spontaneous geomagnetic reversals of the north and south poles that emerge from the underlying dynamics they elucidate (Penn State Department of Geosciences).

Glatzmaier and Roberts and a team working in Japan issued models – the first ever created – in the same year. The Glatzmaier and Roberts model received significantly greater attention “because it successfully reproduced some of the characteristics of the Earth’s field, including geomagnetic reversals” (Wikipedia). Theirs was the first self-consistent numerical model.. was developed that simulates convection and magnetic field generation in a fluid outer core surrounding a solid inner core with the dimensions, rotation rate, heat flow and (as much as possible) the material properties of the Earth's core (Glatzmaier, University of California at Santa Cruz website).

“Until the work of Glatzmaier and Roberts, no detailed dynamically self-consistent model existed that demonstrated this could actually work or explained why the geomagnetic field has the intensity it does, has a strongly dipole-dominated structure with a dipole axis nearly aligned with the Earth's rotation axis, has non-dipolar field structure that varies on the time scale of ten to one hundred years and why the field occasionally undergoes dipole reversals” (ibid).

In order to test various hypotheses, Glatzmaier and Roberts made use of dozens of equations that depict the dynamics of the Earth’s interior. They then “ran a numerical model of the coupling between electromagnetism and fluid dynamics in the interior. Their simulation reproduced key features of the magnetic field over more than 40,000 years of simulated time and the computer generated field reversed itself” (Wikipedia & Glatzmaier and Roberts, 1995). Item #548

CONDITION & DETAILS: First edition in original wraps. Complete. 4to. 11 x 8.5 inches (275 x 213mm). Includes 6 figures, 3 of which are famous color graphics. Mailing address label on front wrap; near fine condition inside and out.

Price: $200.00