ULF Waves in the Ionosphere: Recent Observations and Modelling

ULF Waves in the Ionosphere: Recent Observations and Modelling

F. W. MENK¹, M. D. SCIFFER¹, C. L. WATERS^1,2, B. J. FRASER¹, M. L. PARKINSON³, and P. L DYSON³
¹University of Newcastle, Australia.
² The Johns Hopkins University/Applied Physics Laboratory, USA.
³Physics Department, La Trobe University, Australia.

HF radars provide the opportunity to measure ULF wave fields in the ionosphere simultaneous with their detection by ground magnetometers. Several types of ULF waves are observed at high latitudes, and they should produce characteristic signatures in radar data. The ULF pulsations include (a) field line resonances, with latitude-dependent period, (b) global cavity mode signals, with latitude-independent period, and (c) broadband unstructured Pc1-2 recorded near the cusp and boundary layer. We review the ground and radar signatures of these ULF pulsations, and their use in identifying and monitoring magnetospheric features and their variation. We also examine recent models of ULF wave propagation to and in the ionosphere, and their relevance in explaining the observations.

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ULF Waves in the Ionosphere: Recent Observations and Modelling

F. W. MENK1, M. D. SCIFFER1, C. L. WATERS1,2, B. J. FRASER1, M. L. PARKINSON3, and P. L DYSON3 1University of Newcastle, Australia. 2 The Johns Hopkins University/Applied Physics Laboratory, USA. 3 Physics Department, La Trobe University, Australia.

F. W. MENK¹, M. D. SCIFFER¹, C. L. WATERS^1,2, B. J. FRASER¹, M. L. PARKINSON³, and P. L DYSON³
¹University of Newcastle, Australia.
² The Johns Hopkins University/Applied Physics Laboratory, USA.
³Physics Department, La Trobe University, Australia.