Magnetospheric Waveguide Modes: Coupling to Cavity Modes and Responses to Changes in the Global Magnetospheric Configuration

A sequence of observations from a variety of instruments measured a ten-minute wave, along with related harmonics, in the solar wind, at the magnetopause, inside the magnetosphere, and from the ground. The location and temporal ordering of the wave phenomena reveal information about the causal relationships of the wave excitation and the development of harmonics for this interval. Coupling of a waveguide mode to a compressional, or cavity, mode was observed. Global changes in the magnetospheric configuration lead to changes in the frequency response observed at several locations in the magnetosphere and the ionosphere, such that the observed frequencies remained the same, but the dominant harmonics changed.