ULF pulsation evidence of the plasmapause. II. Polarization studies of Pc 3 and Pc 4 pulsations near L=4 and at a latitude network in the conjugate region

The detailed nonstatistical study of H. Fukunishi and L. J. Lanzerotti (1974) of magnetic pulsations observed on January 5, 1972, is continued in this paper with a thorough examination of the polarization characteristics of Pc 3 and Pc 4 frequency pulsations. The sense of wave polarizations clearly confirms the conclusions of Fukunishi and Lanzerotti that Pc 3 and Pc 4 pulsations near L=4 on this day originate in narrow latitude ranges, the Pc 4 events probably being excited inside the plasmapause and the Pc 3 events probably being excited outside the plasmapause. The phase characteristics of the individual wave trains suggest a long wavelength in the azimuthal direction. By using conjugate data it is concluded for the first time that both the Pc 3 and the Pc 4 waves observed near L=4 can be characterized as odd mode standing Alfven waves.