منابع مشابه
Weaker axially dipolar time-averaged paleomagnetic field based on multidomain-corrected paleointensities from Galapagos lavas.
The geomagnetic field is predominantly dipolar today, and high-fidelity paleomagnetic mean directions from all over the globe strongly support the geocentric axial dipole (GAD) hypothesis for the past few million years. However, the bulk of paleointensity data fails to coincide with the axial dipole prediction of a factor-of-2 equator-to-pole increase in mean field strength, leaving the core dy...
متن کاملConsiderations for Latitudinal Time-Averaged-Field Palaeointensity Analysis of the Last Five Million Years
Central to palaeomagnetism and geophysics is the assumption that the time-averaged geomagnetic field is approximated by a geocentric-axial-dipole (GAD). In this paper, it is demonstrated through the use of a simple cap model that due to secular variation the time-averaged palaeointensity record will always have a smaller latitudinal dependency than a true GAD field. However, the simple cap mode...
متن کاملTime-averaged total force on a dipolar sphere in an electromagnetic field.
We establish the time-averaged total force on a subwavelength-sized particle in a time-harmonic-varying field. Our analysis is not restricted to the spatial dependence of the incident field. We discuss the addition of the radiative reaction term to the polarizability to deal correctly with the scattering force. As an illustration, we assess the degree of accuracy of several previously establish...
متن کاملPlio-Pleistocene time-averaged field in southern Patagonia recorded in lava flows
[1] Paleomagnetic directions were obtained from stepwise alternating-field or thermal demagnetization of 53 lava flows from southern Patagonia (latitudes 49.5 –52.1 S) that include the Pali-Aike volcanic field and the Meseta Viscachas plateau lavas. In addition to previous Miocene-late Quaternary ages of these flows, Ar/Ar dates spanning from 0.1 to 15.4 Ma were obtained for 17 of the sites. Al...
متن کاملTime - dependent angularly averaged inverse transport ( extended
This paper concerns the reconstruction of the absorption and scattering parameters in a time-dependent linear transport equation from knowledge of angularly averaged measurements performed at the boundary of a domain of interest. We show that the absorption coefficient and the spatial component of the scattering coefficient are uniquely determined by such measurements. We obtain stability resul...
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ژورنال
عنوان ژورنال: Reviews of Geophysics
سال: 1990
ISSN: 8755-1209
DOI: 10.1029/rg028i001p00071