SCALE-DEPENDENT ANALYSIS OF IONOSPHERE FLUCTUATIONS

0381044 - ÚFA 2013 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Roux, S. G. - Abry, P. - Koucká Knížová, Petra - Mošna, Zbyšek
SCALE-DEPENDENT ANALYSIS OF IONOSPHERE FLUCTUATIONS.
2011 International Conference on Acoustics Speech and Signal Processing ICASSP. Vol. BXG36. New York: IEEE, 2011, s. 3836-3839. ISBN 978-1-4577-0539-7. ISSN 1520-6149.
[IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP). Prague (CZ), 22.05.2011-27.05.2011]
Výzkumný záměr: CEZ:AV0Z30420517
Klíčová slova: Ionosphere Fluctuations * Multiresolution Analysis * Wavelet Coherence * Scale Invariance
Kód oboru RIV: DG - Vědy o atmosféře, meteorologie
http://www.mirlab.org/conference_papers/International_Conference/ICASSP%202011/pdfs/0003836.pdf

Ionosphere consists of a large complex system whose analysis is of major importance, e. g., for climatology or radio-communications. Therefore, studying its variations, usually analyzed in terms of long-term trends versus short-term fluctuations, as well as the mechanisms driving them is of importance. This contribution hence performs a scale-dependent cross-analysis of the F2-region critical frequency data, locally measured at 11 mid-latitude European stations, and 5 global solar and geomagnetic indices. It shows that such Ionospheric variations are correctly described by the superimposition of well-defined long-term cycles with highly correlated fractional Gaussian noise fluctuations. Also, it is shown that mid-latitude European stations display highly correlated variations even for short-term fluctuations and that, while the solar activity mostly drives long-term cycles, short-term fluctuations are essentially controlled by the geomagnetic activity.
Trvalý link: http://hdl.handle.net/11104/0211602