Computer Science
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979itass..27..705b&link_type=abstract
IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-27, Dec. 1979, pt. 2, p. 705-712.
Computer Science
Digital Filters, Digital Techniques, Ionospheric Electron Density, Signal Processing, Fourier Transformation, Frequency Response, Linear Filters, Lunar Tides, Solar Activity Effects, Spectrum Analysis, Traveling Ionospheric Disturbances
Scientific paper
Ionospheric electron content data contain periodicities that are produced by a diversity of sources including hydromagnetic waves, gravity waves, and lunar tides. Often these periodicities are masked by the strong daily variation in the data. Digital filtering can be used to isolate the weaker components. The filtered data can then be further processed to provide estimates of the source properties. In addition, homomorphic filtering may be used to identify nonlinear interactions in the ionosphere.
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