Wednesday 24 August 2005

G7
1100-1230 hours

253
Determination of the phase structure of Pc3 pulsations at low latitude
Ansari, Iqbal Ahmad¹
1 Aligarh Muslim University, Aligarh, India
Author email: iaaamuphysics@yahoo.co.in
The use of ground based magnetometer arrays has proved to be one of the most successful methods of studying the spatial structure of hydromagnetic waves in the earth's magnetosphere. The spatial and temporal variations observed in wave polarization and signal phase are vitally important since they provide evidence which can be directly related to wave generation mechanisms both inside and external to the magnetosphere and propagation modes inside the magnetosphere. An array of four low latitude induction coil magnetometer stations (L =1.7-2.8) has been used to study longitudinal and latitudinal variations in Pc3 pulsation interstation phase and polarization characteristics. Studies on ten days of data indicate an east-west phase pattern which shows left-hand polarization associated with westward propagation in the afternoon. Similar polarization is seen on latitudinal station pair but propagation is always from north to south away from the equator. Low latitude wave sources are discussed and these results are considered to be consistent with a field line resonance situated at L >3.

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