From continuous f-t spectra of magnetic pulsations observed at Syowa and Mizuho stations in Antarctica, a special type of magnetic pulsation event characterized by a gradual midfrequency rise throughout the entire duration of one hour or so has been found in the magnetic local morning hours. Here these events are named as 'morning IPDP' events. The f-t spectrum consists of irregularly spaced discrete emissions whose midfrequency rises almost linearly with time. The events occurred mostly in the magnetic local time interval of ~3--7 hours and also in the frequency range of ~0.1--0.6 Hz. It is also seen that the discrete elements which form a morning IPDP event are observed simultaneously at the Syowa-Husafell conjugate pair of stations. The relationship between occurrences of morning IPDP events and magnetic disturbances in the auroral zone suggests that these events are closly associated with substorm activity.