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) Surface plots of wave magnitude (rms) as a function of frequency and axial location [(a1) and (b1) at r = 0 m] or radial location [(a2) at z = 23.6975 m and (b2) at z = 25.5125 m]. The left figures (a1) and (a2) are odd-parity gap eigenmode while the right figures (b1) and (b2) are even-parity gap eigenmode.