supported by the National Natural Science Foundation of China(Grant Nos.11673031,11703048,and U1731238);the Open Project Program of the Key Laboratory of FAST,NAOC;the financial support by the European Research Council for the ERC Synergy Grant BlackHoleCam(Grant No.610058);the FAST FELLOWSHIP from Special Funding for Advanced Users,budgeted and administrated by Center for Astronomical Mega-Science,Chinese Academy of Sciences(CAMS);the MPG-CAS Joint Project "Low-Frequency Gravitational Wave Astronomy and Gravitational Physics in Space"
PSR B0919+06 is known for its abnormal emission phenomenon, where the pulse emission window occasionally shifts progressively in longitude and returns afterwards. The physical mechanism behind this phenomenon is still...