Preliminary computation of the gap eigenmode of shear Alfvén waves on the LAPD<xref rid="cpb_27_12_125201_fn1" ref-type="fn">*</xref><fn id="cpb_27_12_125201_fn1"><label>*</label> <p>Project supported by the National Natural Science Foundation of China (Grant No. 11405271), the China Postdoctoral Science Foundation (Grant No. 2017M612901), the Fund from Chongqing Science and Technology Commission (Grant No. cstc2017jcyjAX0047), Chongqing Postdoctoral Special Foundation (Grant No. Xm2017109), the Fundamental Research Funds for Central Universities, China (Grant No. YJ201796), the Pre-research Key Laboratory Fund for Equipment (Grant No. 61422070306), and the Fund from the Laboratory of Advanced Space Propulsion (Grant No. LabASP-2017-10).</p></fn>

Preliminary computation of the gap eigenmode of shear Alfvén waves on the LAPD**

Project supported by the National Natural Science Foundation of China (Grant No. 11405271), the China Postdoctoral Science Foundation (Grant No. 2017M612901), the Fund from Chongqing Science and Technology Commission (Grant No. cstc2017jcyjAX0047), Chongqing Postdoctoral Special Foundation (Grant No. Xm2017109), the Fundamental Research Funds for Central Universities, China (Grant No. YJ201796), the Pre-research Key Laboratory Fund for Equipment (Grant No. 61422070306), and the Fund from the Laboratory of Advanced Space Propulsion (Grant No. LabASP-2017-10).

Chang Lei^†,

(color online) Axial profiles (r = 0 m) of the azimuthal components of wave magnetic field [panels (a1) and (b1)] and wave electric field [panels (a1) and (b2)] for odd-parity (140 kHz) and even-parity (185 kHz) peak gap eigenmodes. The black bar and green dot-dashed line label the locations of external driving antenna and periodicity-broken defect, respectively. The odd-parity and even-parity phrases characterize the wave electric field across these defects at z = 23.6975 m and z = 25.5125 m, respectively.