Statistics – Computation
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..ses.db007m&link_type=abstract
American Physical Society, 71st Annual Meeting of the Southeastern Section, 11-13 November, 2004, Oak Ridge, TN. MEETING ID: S
Statistics
Computation
Scientific paper
Several years ago we establishedfootnote K.L. McDonald, On The Planetary Dynamo Theory, ESSA Tech. Report 64-ESL 3 (Govt. Printing Office, 1968)footnote K.L. McDonald, Computations in Theoretical Physics..., Univ. Utah Expt. Sta. Bull.138, Feb. 1, 1966, pp.117-8 that both principal magnetic modes Plc0 and T2c0 are destroyed by fluid motions of convective outflow at higher latitudes (polar caps) with subsidence in equatorial regions for both direction senses of B-field; a reversed fluid motion augments these modes and displaces heat sources Si towards equator. Readers should verify these statements by applying concepts of motional electromotive force, force/unit charge, namely, E = (1/c) v x B, and Lorentz force, learned in college sophomore year. The beginning phase of reversals occurs in only one of the two hemispheres and then is transferred by generated meridional motions to other hemisphere, they being interconnected by an incremental latitude region Z centered about Earth's equatorial plane and lying radially between inner core, r V 1240 km, and mantle. A more rapid meridional motion in N. Hemisphere, being guided by dipole magnetic field lines, speeds up that of S. Hemisphere, and conversely, to equatorial plane where fluid descends to flow over solid inner core thereby reducing pre-ponderance of heat sources at equator until nullity of polidal dipole, in 2-3 x 103 yr, while retraining a constant obliquity angle of 11.49 . In absence of dipole guidance, equatorial subsidence is lost and heat sources again migrate, randomly, towards equator thereby, on occasion, repelling axial up-welling fluid motions and eventually destroying coalesced heat sources, thereby restoring regeneration after another 2-3 thousand years. With a regeneration time of same duration, whole reversal process would be 6-9 x 103 yr, T104 yr.
K.L. McDonald and D.E. Watson, Constant Obliquity Angle Between Geomagnetic and Geographic Axes, The Astronomical Journal, 73, No. 10, Part II (Supplement, December, 1968).
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