A theory of long period magnetic pulsations. III - Local field line oscillations

Details A theory of long period magnetic pulsations. III - Local field line oscillations A theory of long period magnetic pulsations. III - Local field line oscillations

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..765h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, Aug. 1983, p. 765-767.

Physics

70

Geomagnetic Pulsations, Magnetohydrodynamic Waves, Space Plasmas, Earth Ionosphere, Resonant Frequencies

Scientific paper

It is shown that, in the presence of a broadband source, a local field line can oscillate at its Alfven resonance frequency (or frequencies) if the frequency band of the source covers the resonance frequency (or frequencies). The result shows that it is possible in theory to observe an L-dependence in magnetic pulsations during a given event. The difficulty of observing L-dependent pulsations on the ground may arise from a shielding effect of the ionosphere if the localization of such oscillations occurs within an ion's equatorial Larmor radius.

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