Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1811h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 18, p. 1811-1814.
Physics
60
Earth Magnetosphere, Extremely Low Radio Frequencies, Magnetohydrodynamic Waves, Propagation Modes, Solar Terrestrial Interactions, Standing Waves, Magnetosheath, Space Plasmas, Wave Propagation
Scientific paper
Field line resonances with frequencies in the range 1 to 4 mHz have recently been observed by the JHU/APL HF Doppler radar during quiescent geomagnetic conditions. These structures are observed to have stable frequencies for durations of several hours, leading us to the conclusion that they may be standing waves (in the radial direction, as opposed to standing waves along a field line) of the magnetosphere driven by the solar wind. Using this premise, the propagation of fast mode ULF waves in the magnetosheath and the near-earth magnetosphere are examined in an ideal, linearized MHD context. A model is presented in which fast waves propagate in the equatorial plane between the flanks of the bow shock and a turning point deep within the magnetosphere. Using a realistic set of magnetospheric parameters, it is possible to reproduce the set of observed frequencies and the respective positions of their field line resonances within the ionosphere (assuming a dipole mapping).
Harrold B. G.
Samson John C.
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