Open AccessConductivity Models and Banks' Data
Author(s) -
Jady R. J.
Publication year - 1974
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1974.tb04096.x
Subject(s) - conductivity , shell (structure) , range (aeronautics) , electrical resistivity and conductivity , surface conductivity , low frequency , materials science , computational physics , geology , condensed matter physics , physics , composite material , quantum mechanics , astronomy
Summary The magnetic response data of Banks has been used to determine an ensemble of conductivity models. Each model consists of a uniformly conducting thick shell surrounding a perfectly conducting inner sphere. The conductivity and thickness of the shell are found for each observed response measurement in the frequency range. The results show that the data leads to inconsistencies, and confirms the conclusions by Parker concerning this data. It is also found here that the low frequency response measurements, in particular, are unreliable. It is concluded that, neglecting the low frequency measurements, Banks' data requires the conductivity to be low for the first 550km, or so, from the surface, followed by a gradual rise. The thickness of the transition region is uncertain, but could be as great as 300 km.