Computer Science – Sound
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa72b0529s&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SA72B-0529
Computer Science
Sound
2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting, 2487 Wave Propagation (6934)
Scientific paper
The present work provides a contribution to the study of short-term variabilities (from 15 minutes to 4 hours) observed in F region of ionosphere and due to acoustic-gravity waves (AGW). To this end, electron densities are measured in Pruhonice observatory (49.9N, 14.5E - vertical ionospheric sounding with repetition time 5 minutes and 1 minute). From data, collected during several campaigns of rapid sequence sounding, one-dimensional time series are constructed and analysed, consisting of diurnal variation of electron concentration. The aim of the analysis proposed here is to detect wave-like structures related to AGW and to characterize them with respect to solar and geomagnetic conditions and solar eclipse event. Data from high as well as low solar activity periods are used. Information contained in one dimensional time series is represented into a Time and Period two-dimensional plan thanks to Continuous Wavelet Transforms. The analysis of wavelet power spectra (squared-modulus of the wavelet coefficients) computed at various heights allows to detect and to locate dominant modes of variability. Then, it enables to characterize those wave-like structures and to determine their key parameters (onset time, period, period-height shift, vertical component of phase velocity, group velocity etc.). Simulations are also conducted, consisting of numerical propagation of acoustic-gravity type waves. The analysis of the corresponding wavelet power spectra offers a useful help in interpretation those obtained form actual data. Such studies show the existence of various families of propagating waves that can be characterized and classified through the values to which their different parameters adjust.
Abry Patrice
Boška J.
Šauli P.
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