Toroidal and Poloidal Alfven Waves and Field Line Resonances 时间：2013-09-29星期日下午15:00

Time：September29, 2013，Sunday,15:00 p.m

地点：四楼报告厅

R. Rankin, A. Degeling, and D. Sydorenko

University of Alberta

In this presentation I shall briefly describe the characteristics of ultra low frequency (ULF) pulsations in Earth's magnetosphere, and consider how they are generated and filtered by the magnetosphere. I will review some Canadian ground-based observations of ULF waves as detected using all-sky cameras, meridian scanning photometers, HF-radar and magnetometers. An example of broad-band excitation of ULF waves in Earth's magnetosphere will be illustrated using observations from THEMIS, whch show agreement with models of the Alfven continuum. The concept of "magic frequencies" will be introduced along with a discussion of how quantized cavity mode field line resonances might be related to the onset of geomagnetic storms. The emphasis of the talk will then shift to a discussion of the influence of ULF waves on energetic particles in the radiation belts. Results from ULF wave-particle interaction models will be discussed in the context of pressure pulse or shock-excitation of magnetospheric ULF waves.

Brief Bio:

Robert Rankin was born in Scotland, obtained his undergraduate degree in Glasgow, and his postgraduate degree in the university of Wales. He moved to Canada in 1984, where he did a postdoctoral fellowship at the University of Alberta. He has worked in a variety of fields including laser-plasma interactions, plasma x-ray sources, and space physics. Rankin's work is substantially supported by grants and contracts from the Canadian Space Agency. He has undertaken work in computational space plasma physics, parallel computing and cloud computing. His most recent work involves studies of the solar wind interaction with Mercury, and studies of dust charging and transport over the lunar surface. Rankin is looking forward to analyzing data from the enhanced polar outflow probe e-POP, scheduled for launch on September 29 on a Space-X Falcon 9 rocket.