Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1765603 | Advances in Space Research | 2009 | 8 Pages |
Abstract
We present results of the spectral analysis of data series of Doppler frequency shifted signals reflected from the ionosphere, using experimental data received at Kazan University, Russia. Spectra of variations with periods from 1Â min to 60Â days have been calculated and analyzed for different scales of periods. The power spectral density for spring and winter differs by a factor of 3-4. Local maxima of variation amplitude are detected, which are statistically significant. The periods of these amplitude increases range from 6 to 12Â min for winter, and from 24 to 48Â min for autumn. Properties of spectra for variations with the periods of 1-72Â h have been analyzed. The maximum of variation intensity for all seasons and frequencies corresponds to the period of 24Â h. Spectra of variations with periods from 3 to 60Â days have been calculated. The maxima periods of power spectral density have been detected by the MUSIC method for the high spectral resolution. The detected periods correspond to planetary wave periods. Analysis of spectra for days with different level of geomagnetic activity shows that the intensity of variations for days with a high level of geomagnetic activity is higher.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Space and Planetary Science
Authors
I.R. Petrova, V.V. Bochkarev, R.R. Latipov,