Abstract:
Traveling ionospheric disturbances are an ionospheric manifestation of atmospheric gravity waves that occur in the neutral atmosphere. There are different Source of mechanisms for TIDs, such as auroral electrojet (Joule heating and Lorentz force., solar terminators (sunrise and sunset solar terminators., energetic particle precipitation, magnetic storms, tropospheric weather and mountain turbulence. TIDs appear in power spectra of SuperDARN radars as spatially localized enhancements and as quasi-periodic fluctuations in Doppler velocities and reflection heights. SuperDARN is a network of HF radars designed to study plasma convection and plasma density irregularities in the E and F-regions of the ionosphere at high and mid-latitudes. The network consists of 35 low-power HF radars,23 radars in the Northern hemisphere and 12 in the Southern hemisphere, with a collaboration of 10 countries. South Africa is one of the collaborating countries with HF radar installed at the SANAE IV station in Antarctica. There haven't been many studies done on TIDs observed in the southern polar hemisphere, in particular, by the SANAE HF radar. This paper aims to investigate TIDs events observed by SANAE SuperDARN radar in more details. The investigation includes propagation direction, frequency and wavelength of the TIDs events and also possible source of mechanisms of the TIDs events. For this study we will use data from SANAE radar and other radars which have field of view that overlap with SANAE radar. - Abstract as displayed in the - Abstract booklet. The presentation on the day may differ from the - Abstract.
