A study of latitudinal dependence of Pc 3-4 amplitudes at 96º magnetic meridian stations in Africa

Details A study of latitudinal dependence of Pc 3-4 amplitudes at 96º magnetic meridian stations in Africa A study of latitudinal dependence of Pc 3-4 amplitudes at 96º magnetic meridian stations in Africa

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sunge...6...67t&link_type=abstract

Sun and Geosphere, vol.6, no.2, p.67-72.

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Scientific paper

The study of latitudinal dependence of Pc 3-4 amplitudes at very low latitudes particularly near the dip equator is very important to identify the propagation mechanisms of the equatorial Pc 3-4 pulsations. Therefore, geomagnetic data simultaneously recorded at the MAGDAS African stations along the 96º Magnetic Meridian chain were analyzed to examine the latitudinal dependence of Pc 3-4 amplitudes at the equatorial and very low latitudes up to middle latitudes. During three and a half months between 4 October 2008 and 22 January 2009, 21 Pc 3 events and 25 Pc 4 events were selected for studying the latitudinal dependence of Pc 3-4 amplitudes. The latitudinal profile of the Pc 3 amplitude ratio indicates attenuation in the Pc 3 amplitudes at the dip equator. This attenuation may be due to the ionospheric shielding effect. On the other hand, the Pc 4 amplitude shows a peak at dip equator and decreased with increasing latitude up to middle latitudes as it revealed from the latitudinal profile of the Pc 4 amplitude ratio. According to the obtained results, the main source of the equatorial Pc 3 must be related to the compressional upstream waves, while the equatorial Pc 4 may be linked with the compressional upstream waves and/or the Pc 4 excited at higher latitudes.

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