Conjugacy of ELF-VHF emissions near L=6

Conjugate observations of ELF-VLF emissions, magnetic pulsations and auroras were carried out in Antarctica and Iceland. Ray paths suggest that differences in intensities of auroral and polar chorus emissions at the conjugate points are due to different propagation paths from the generation regions in the magnetosphere to the ground, since the magnetic field configuration and the plasma density distribution along the lines are different between the Northern and Southern Hemispheres. Nonconjugacy of auroral hiss emissions is due to the higher growth rate of whistler mode waves excited by auroral electrons in the winter hemisphere topside ionosphere. Quasi-periodic VLF emissions with period of 15 to 50 sec observed simultaneously at the conjugate-pair stations suggest that the emissions are generated near the equatorial regions in the magnetosphere and propagate to both hemispheres along the field lines.