Simultaneous whistler records of one station and geomagnetic pulsation (Pc3) records Alfalfa at three stations were compared.In a previous study correlation was found between occurrence and L value of propagation/excitation for the two phenomena.The recently investigated simultaneous records have shown that the correlation is better on longer time scales (days) than on shorter ones (minutes), but the L values of the propagation of whistlers/excitation of pulsations are correlated, i.
e.if whistlers propagate in higher latitude ducts, Parts pulsations have periods longer than in the case when whistlers propagate in lower latitude ducts.Key words: Electromagnetics (wave propagation) - Magnetospheric physics (magnetospheric configuration and dynamics; MHD waves and instabilities).