Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 1, pp. 299-305
Observations of the total electron content variations in the solar terminator region of the ionosphere
O.P. Borchevkina
1 , I.V. Karpov
2, 1 1 Immanuel Kant Baltic Federal University, Kaliningrad, Russia
2 Kaliningrad Branch of N. V. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, Kaliningrad, Russia
Accepted: 03.11.2017
DOI: 10.21046/2070-7401-2018-15-1-299-305
This work presents the technique for segregating the spectra of ionosphere variations with periods of acoustic gravity waves (AGWs) and internal gravity waves (GWs) based on observations of navigational satellites signals. Spectral characteristics of ionosphere variations are determined using observations of the total electron content (TEC) on the “satellite – ground-based receiver” routes with the help of harmonic analysis methods. Observation time for navigational satellites signals may be up to several hours, which allows to analyze the dynamics of TEC variations spectra within the range of AGWs and GWs periods during one observation session. Capabilities of the proposed technique are exemplified by analysis of harmonic components of TEC variations, obtained by observing the GPS satellites signals at the Baltic Region ground-based receivers at the time of passing of the solar terminator (ST). Analysis of TEC observations made at the time of passing of the ST has revealed the increase of amplitudes of variations with AGWs periods within the ranges 6–8 min and 14–20 min, and shown the specifics of their dynamics at all stages of passage of the solar terminator. The increase of amplitudes of harmonics with GWs periods in the range 14–20 min is registered before and after the passing of the solar terminator over the observing station. The amplitude spikes for harmonics with AGWs periods in the range 6–8 min are random and may appear at all stages of passage of the ST. According to the results obtained, it is assumed that ionosphere variations in frequency ranges involved are driven by upward propagation of waves from the lower atmosphere.
Keywords: ionosphere, total electron content, acoustic-gravity waves, internal gravity waves, solar terminator
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