Experiments with maximum entropy power spectra of sinusoids

Chen, W. Y.; Stegen, G. R.

doi:10.1029/jb079i020p03019

Cited by 213 publications

(59 citation statements)

References 4 publications

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“…According to Chen and Stegen (1974), the MEM gives a reasonably good spectrum for data length that covers more than a full cycle of a sinusoid. Ulrych (1972) showed that the sharp spectral peak was given from the data containing only 57% of a cycle of a sinusoid.…”

Section: Data and Methods Of Analysismentioning

confidence: 99%

Intraseasonal Variations of OLR in the Tropics During the FGGE Year

Nakazawa¹

1986

Journal of the Meteorological Society of Japan

118

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The intraseasonal behaviors of outgoing long wave radiation (OLR) obtained from polar orbiting satellites are investigated for the period from January through November 1979.The power spectrum of the OLR data for the whole period has revealed the existence of 30-60 day and 15-25 day periodicities.The intense power for the 30-60 day period range appears over southern Indonesia to northern Australia during the Southern Hemisphere summer, and over South Asia during the Northern Hemisphere summer.The relationship between the intraseasonal variations and tropical cyclone activities was analyzed.In most cases during both hemisphere summers, the generation and growth of tropical cyclones occur during the active phase of the intraseasonal variations.The relationship between the intraseasonal variations and short-period (3-10 days) fluctuations was also investigated.The 3-10 day fluctuations show clear amplitude modulation with 30-60 day period which is the same periodicity as the intraseasonal variations. The amplitude of short-period fluctuations becomes large (small) during the active (break) phase of the intraseasonal variations.Eastward moving wavenumber 1 component is prominent for the amplitude modulation of the 3-10 day fluctuations with 30-60 day period.

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Section: Data and Methods Of Analysismentioning

confidence: 99%

Intraseasonal Variations of OLR in the Tropics During the FGGE Year

Nakazawa¹

1986

Journal of the Meteorological Society of Japan

118

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“…On the other hand, the frequency at which the MEM spectrum for the truncated sinusoid has maximum oscillates between 0 and 1.84 times the frequency of the sinusoids for all possible initial phases when the truncation length of data is nearly equal to a quater times the period of the sinusoids (Ulrych, 1972 andChen andStegen, 1974).…”

Section: Effect Of the Length Of Prediction Error Filtermentioning

confidence: 99%

On the . Application of the Method of Maximum Entropy Spectral Analysis to Processes with Continuous Power Spectrum over Wide Frequency Range

Iwatani¹

1984

Journal of the Meteorological Society of Japan

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“…When using MESA, the spectral resolution is greatly influenced by the number of terms or order of the prediction error filter (PEF); consequently, it is important to determine and use the correct PEF order (Chen and Stegen, 1974). A PEF order that is too small results in a highly smoothed spectrum where some peaks may not be resolved, thus precluding the advantages of MESA.…”

Section: Champ Datamentioning

confidence: 99%

Spectral structure of Pc3–4 pulsations: possible signatures of cavity modes

Sutcliffe

Heilig²,

Lotz³

2013

Ann. Geophys.

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In this study we investigate the spectral structure of Pc3–4 pulsations observed at low and midlatitudes. For this purpose, ground-based magnetometer data recorded at the MM100 stations in Europe and at two low latitude stations in South Africa were used. In addition, fluxgate magnetometer data from the CHAMP (CHAllenging Minisatellite Payload) low Earth orbit satellite were used. The results of our analysis suggest that at least three mechanisms contribute to the spectral content of Pc3–4 pulsations typically observed at these latitudes. We confirm that a typical Pc3–4 pulsation contains a field line resonance (FLR) contribution, with latitude dependent frequency, and an upstream wave (UW) contribution, with frequency proportional to the IMF (interplanetary magnetic field) magnitude B_IMF. Besides the FLR and UW contributions, the Pc3–4 pulsations consistently contain signals at other frequencies that are independent of latitude and B_IMF. We suggest that the most likely explanation for these additional frequency contributions is that they are fast mode resonances (FMRs) related to cavity, waveguide, or virtual modes. Although the above contributions to the pulsation spectral structure have been reported previously, we believe that this is the first time where evidence is presented showing that they are all present simultaneously in both ground-based and satellite data

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Experiments with maximum entropy power spectra of sinusoids

Cited by 213 publications

References 4 publications

Intraseasonal Variations of OLR in the Tropics During the FGGE Year

Intraseasonal Variations of OLR in the Tropics During the FGGE Year

On the . Application of the Method of Maximum Entropy Spectral Analysis to Processes with Continuous Power Spectrum over Wide Frequency Range

Spectral structure of Pc3–4 pulsations: possible signatures of cavity modes

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