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Magnetic elliptical polarization of Schumann resonancesMeasurements of orthogonal, horizontal components of the magnetic field in the ELF range obtained during September 1985 show that the Schumann resonance eigenfrequencies determined separately for the north-south and east-west magnetic components differ by as much as 0.5 Hz, suggesting that the underlying magnetic signal is not linearly polarized at such times. The high degree of magnetic ellipticity found suggests that the side multiplets of the Schumann resonances corresponding to azimuthally inhomogeneous normal modes are strongly excited in the highly asymmetric earth-ionosphere cavity. The dominant sense of polarization over the measurement passband is found to be right-handed during local daylight hours, and to be left-handed during local nighttime hours.
Document ID
19870060839
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sentman, D. D.
(California, University Los Angeles, United States)
Date Acquired
August 13, 2013
Publication Date
August 1, 1987
Publication Information
Publication: Radio Science
Volume: 22
ISSN: 0048-6604
Subject Category
Geophysics
Accession Number
87A48113
Funding Number(s)
CONTRACT_GRANT: NGL-05-007-004
CONTRACT_GRANT: W-7405-ENG-48
CONTRACT_GRANT: W-7405-ENG-36
Distribution Limits
Public
Copyright
Other

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