Pc1 pulsations are important to consider for the interpretation of wave-particle
interactions in the Earth’s magnetosphere. In fact, the wave properties of these
pulsations change dynamically when they propagate from the source region in the space to
the ground. A detailed study of the wave features can help understanding their time
evolution mechanisms. In this study, we statistically analyzed Pc1 pulsations observed
by a Bohyunsan (BOH) magneto-impedance (MI) sensor located in Korea (L = 1.3) for ~one
solar cycle (November 2009-August 2018). In particular, we investigated the temporal
occurrence ratio of Pc1 pulsations (considering seasonal, diurnal, and annual variations
in the solar cycle), their wave properties (e.g., duration, peak frequency, and
bandwidth), and their relationship with geomagnetic activities by considering the Kp and
Dst indices in correspondence of the Pc1 pulsation events. We found that the Pc1 waves
frequently occurred in March in the dawn (1-3 magnetic local time (MLT)) sector, during
the declining phase of the solar cycle. They generally continued for 2-5 minutes,
reaching a peak frequency of ~0.9 Hz. Finally, most of the pulsations have strong
dependence on the geomagnetic storm and observed during the early recovery phase of the
geomagnetic storm.