Signatures Of Wave Propagation In The Topside Ionosphere

Details Signatures Of Wave Propagation In The Topside Ionosphere Signatures Of Wave Propagation In The Topside Ionosphere

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa53b1583b&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA53B-1583

Other

2435 Ionospheric Disturbances, 2481 Topside Ionosphere, 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2494 Instruments And Techniques

Scientific paper

One of the most powerful methods to study the Earth's ionosphere and other mediums and its interactions with the topside ionosphere is the Incoherent scatter (IS) radar. In order to determine the characteristics of the ionosphere the Arecibo Observatory uses 430 MHz radar for this purpose. The Arecibo radar is extremely powerful and sensitive and it is capable of making very accurate measurements of many ionospheric parameters. In this work, data analysis was performed with hydrogen and helium concentrations, electron density, and ion and electron temperatures for the period from March 7 - March 11, 2008. These records display radar data from twenty eight different altitudes (224 to 1248km of altitude with step of 38km) with an acquisition rate of about twenty minutes. Analysis of harmonic dependence by altitude and local time was performed using Fast Fourier Transform, giving dominant frequencies which allowed the reconstruction of the signal with periodicities bigger than 45 minutes. Finally, analysis of the data using Wavelets Transform method was applied in order to determine which the dominant frequencies in the different altitudes and time are. We analyzed periodicities lower than 16 hours. Previews results from the hydrogen and electron density and temperature shows some evidence of waves with periodicity around 7.5 hours propagating in the topside ionosphere that weaken with the decrease of altitude in the range studied. Same behavior was observed in the rest of the profiles.

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