The Occurrence and Characteristics of Low Latitude Ultra-Low Frequency Waves in Egypt

Monday, 14 December 2015
Poster Hall (Moscone South)
Essam Ghamry1, Ahmed Lethy2 and Tareq Arafa-Hamed2, (1)National Research Institute of Astronomy and Geophysics, Helwan, Egypt, (2)NRIAG, Helwan, Egypt
We have examined the ULF wave activities in the Egyptian observatories (Misallat and Abu Simbel) using high resolution geomagnetic field data. The fluctuations detected at Misallat (L = 1.23) and Abu Simbel (L = 1.07) ground magnetometers data during last three years have been investigated in the range of 1-100 mHz (Pi2, Pc3, Pc4 and Pc5 micropulsations). A typical Pc3–4 pulsation contains a field line resonance and an upstream wave contribution. We focused on night-time events (1800-0600 local time) which show all the characteristics of Pi2 pulsations. This study suggests that low-latitude Pi2 pulsations detected at the two Egyptian observatories caused by plasmaspheric cavity mode resonance.