Computer Science – Sound
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jatp...39.1217c&link_type=abstract
(IUGG, IAGA, COSPAR, URSI, NOAA, USAF, Australian Academy of Science, and Australian Institute of Physics, International Symposi
Computer Science
Sound
1
Equatorial Electrojet, Geomagnetism, Magnetic Variations, Power Spectra, Tropical Regions, Aeronomy, Diurnal Variations, Fast Fourier Transformations, Ionospheric Sounding, Spectrum Analysis
Scientific paper
Geomagnetic field characteristics unique to the equatorial region are described. Field spectra from eight standard observations at geomagnetic latitudes below 30 deg were studied, and emphasis was placed upon those variations having periods between 5 min and 4 hr for a selection of magnetically quiet, average, and active days in 1965. The power spectral density at the equator was about ten times that near 30 deg latitude, and the initial manifestation of the equatorial electrojet as evidenced by the east-west alignment of the horizontal field or the change in vertical amplitudes occurred below about deg latitude. The horizontal north-south alignment of the spectral field components increases with increasing period and with geomagnetic activity level, while the equatorial enhancement of the field is more narrowly defined in latitude than the equatorial north-south alignment characteristics.
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