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Background magnetic spectra: ∼10 −5 to ∼10 5 Hz
Author(s) -
Lanzerotti L. J.,
Maclennan C. G.,
FraserSmith A. C.
Publication year - 1990
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl017i010p01593
Subject(s) - earth's magnetic field , amplitude , physics , quiet , range (aeronautics) , noise (video) , spectral line , instrumentation (computer programming) , geology , magnetic field , astronomy , optics , materials science , image (mathematics) , quantum mechanics , artificial intelligence , computer science , composite material , operating system
The Arrival Heights area of the Hut Point Peninsula on Ross Island has been designated the 2nd Site of Special Scientific Interest (SSSI) on the Antarctic continent. It is the only SSSI in Antarctica designated as a natural electromagnetically ‘quiet site’. As the electromagnetic noise levels of civilization increase world‐wide, such sites around the world, if preserved, will be of increasing scientific importance. We report here the determination of the amplitude and functional form of the geomagnetic fluctuations measured at Arrival Heights in June 1986. The frequency range covered is from ∼10 −5 to ∼10 5 Hz, with a gap between ∼10 −1 to ∼10¹ Hz due to instrumentation limitations. Over this frequency range, which is larger than any reported previously from any site on Earth, the magnetic field amplitude spectrum in units of / falls with increasing frequency f as ∼ f −1 to ∼ f −1.5 , and has a value of ∼ 10 8 / at f ∼10 −3 Hz.