The ULF modulation of ELF-VLF emissions close to the magnetospheric boundary
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.
Details
Publication status:
Published
Author(s):
Authors: Morrison, K., Engebretson, M. J., Beck, J. R., Johnson, J. E., Arnoldy, R. L., Cahill, L. J., Carpenter, D. L.
Editors: Holtet, Jan A., Egeland, Alv
Date:
1 January, 1994
Journal/Source:
In: Holtet, Jan A., Egeland, Alv (eds.). Physical Signatures of Magnetospheric Boundary Layer Processes, Dordrecht, Springer, 375-381.