Regional deep sounding at high latitudes of the Northern Hemisphere

Details Regional deep sounding at high latitudes of the Northern Hemisphere Regional deep sounding at high latitudes of the Northern Hemisphere

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...26..217f&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 26, Issue 3, p. 217-229.

Physics

1

Scientific paper

Methods were developed for carrying out spherical harmonical analysis of disturbed diurnal variations over a limited territory at high latitudes of the Northern Hemisphere. The ratios ƒ;n|staggered||m of the external and internal parts of the magnetic potential were evaluated for spherical harmonics 4 <= n <= 12. Different from generally accepted ƒ;n|staggered||m values for Sq variations (2 ÷ 3), they proved to be considerably higher and attained 10 for n >= 8. This result testifies to a small contribution of induced fields into disturbed diurnal variations observed at high latitudes.
A deep sounding was carried out from spherical analysis data. It is shown that the mean distribution of the electrical conductivity at high latitudes σ(r) is the same as the global mean distribution for the whole Earth and that, consequently, it may serve as a reference for local soundings.

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