  PSR B0919+06 generally radiates radio pulses in a normal phase range. It has
been known for its occasional perplexing abnormal emission events wherein
individual pulses come to an earlier phase range for a few tens of periods and
then returns to its usual phase. Heretofore, only a few such events have been
available for study. We observed PSR B0919+06 for about 30 hours using the
Jiamusi 66-m telescope at Jiamusi Deep Space Station at S-band, and detected 92
abnormal emission events. We identify four types of events based on the
abrupted or gradual phase-shifting of individual pulses. The abnormal emission
events are seen to occur randomly some every 1000 to 3000 periods, and they
affect the leading edge of the mean profile by up to 2\% in amplitude. The
abnormal emission events are probably related to gradual changes of emission
processing in the pulsar magnetosphere.
