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A statistical analysis ofthe geomagnetic field fluctuations in the Pc5 frequency range (1–5 mHz) at alow latitude station (L = 1.6) provides further evidence for daytime power peaksat discrete frequencies. The power enhancements, which become more pronouncedduring high solar wind pressure conditions, may be interpreted in terms ofground signatures of magnetospheric cavity/waveguide compressional modes drivenby solar wind pressure pulses. In this sense, the much clearer statisticalevidence for afternoon events can be related to corotating structures mainlyimpinging the postnoon magnetopause. A comparison with results obtained for thesame time intervals from previous investigations at higher latitudes and in theEarth’s magnetosphere confirms the global character of the observedmodes.  <b>Key words. </b>Magnetospheric physics (MHD waves andinstabilities; solar wind-magnetospheric interactions

Pc5 geomagnetic field fluctuations at discrete frequencies at a low latitude station