The ULF modulation of ELF-VLF emissions close to the magnetospheric boundary

• Main Authors: Morrison, K., Engebretson, M. J., Beck, J. R., Johnson, J. E., Arnoldy, R. L., Cahill, L. J., Carpenter, D. L.
• Other Authors: Holtet, Jan A., Egeland, Alv
• Format: Book Part
• Language: unknown
• Published: Springer 1994
• Subjects: Antarctic; Antarc*
• Online Access: http://nora.nerc.ac.uk/id/eprint/516690/; https://doi.org/10.1007/978-94-011-1052-5_26

The spatial extent and temporal behaviour of quasi-periodic (QP) intensity modulations of 0.5-2kHz ELF-VLF emissions were investigated in a comparative study of data collected at three Antarctic stations. Frequently, the waveforms of the ELF-VLF signals received at each site were identical. The emissions are identified with the periodic modulation of the electron pitch-angle distribution by the propagation of ULF compressional fast-mode waves through a region. In addition to generation close to the equatorial plane, we propose an additional high-latitude source of QP emissions. These emissions are associated with regions of minimum-B produced by the dayside compression of the magnetosphere close to the magnetopause.