Physics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ncimc...7..611v&link_type=abstract
(Convegno Nazionale di Fisica Cosmica, 2nd, L'Aquila, Italy, May 29-June 1, 1984) Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol
Physics
Fast Fourier Transformations, Interplanetary Magnetic Fields, Maximum Entropy Method, Power Spectra, Solar Terrestrial Interactions, Solar Wind, Bow Waves, Geomagnetism, International Sun Earth Explorer 2, Plasma Turbulence, Signal Analysis, Spectrum Analysis
Scientific paper
The maximum-entropy-method (MEM) of Burg (1978), as adapted for the spectral analysis of geophysical signals by Vellante and Villante (1984), is applied to ISEE-2 observations of solar-wind turbulence upstream of the earth bow shock; the results are presented in tables and graphs and compared with those obtained by standard FFT analysis. MEM is found to reveal the dominant wave form dramatically and to give its position more accurately (despite the appearance of secondary peaks at higher orders of the prediction error filter) than the FFT approach. Since MEM gives fewer power-spectrum peaks than FFT, it is suggested that fewer spurious peaks may be included, although the MEM power spectrum at higher prediction-error-filter orders remains ambiguous.
Febo R.
Vellante Massimo
Villante Umberto
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