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Observations of wave activity in the ionosphere over South Africa in geomagnetically quiet and disturbed periods |
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| Authors: | T Sindelarova Z Mosna D Buresova J Chum L-A McKinnell R Athieno |
| Institution: | 1. Institute of Atmospheric Physics, Academy of Sciences of the Czech Republic, Bocni II 1401, 141 31 Prague 4, Czech Republic;2. Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague 2, Czech Republic;3. South African National Space Agency (SANSA) Space Science, P.O. Box 32, Hermanus 7200, South Africa;4. Department of Physics & Electronics, Rhodes University, P.O. Box 94, Grahamstown 6140, South Africa;5. Physics Department, University of New Brunswick, 8 Bailey Drive, P.O. Box 4400, Fredericton, NB, Canada E3B 5A |
| Abstract: | The present paper deals with observations of wave activity in the period range 1–60 min at ionospheric heights over the Western Cape, South Africa from May 2010 to July 2010. The study is based on the Doppler type sounding of the ionosphere. The Doppler frequency shift measurements are supplemented with measurements of collocated Digisonde DPS-4D at SANSA Space Sciences, Hermanus. Nine geomagnetically quiet days and nine geomagnetically active days were included in the study. Waves of periods 4–30 min were observed during the daytime independent of the level of geomagnetic activity. Amplitudes of 10–30 min waves always increased between 14:00 and 16:15 UT (16:00–18:15 LT). Secondary maxima were observed between 06:00 and 07:00 UT (08:00–09:00 LT). The maximum wave amplitudes occurred close to the time of passage of the solar terminator in the studied region which is known to act as a source of gravity waves. |
| Keywords: | Waves in the ionosphere HF Doppler type sounding Geomagnetic activity |
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