The temporal evolution of Whistler-mode waves; the relationship between space based observations, ground based observations and energetic electrons.

Details The temporal evolution of Whistler-mode waves; the relationship between space based observations, ground based observations and energetic electrons. The temporal evolution of Whistler-mode waves; the relationship between space based observations, ground based observations and energetic electrons.

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm71a0587a&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM71A-0587

Physics

2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities, 2788 Storms And Substorms

Scientific paper

One of the defining characteristics of substorm onset is the injection of energetic electrons. The observed evolution of the energy spectra of these injected electrons has been well documented and is understood in terms of energy dispersed gradient-curvature drifts. A less defining, but often observed, characteristic is the enhancement of equatorial whistler mode wave amplitudes. Whilst studies have categorised the occurrence of these waves in terms of location and geomagnetic activity levels, to our knowledge no attempt has been made to document and explain the evolution of the whistler frequency spectrum as has been done with injected electrons. In this paper we address this problem by examining 22 case studies of CRRES observations of substorm enhanced whistler mode waves. These observations were made close to the geomagnetic equator and between 02:00 and 06:00 MLT. The frequency of the enhanced whistler waves is seen to vary strongly with magnetic field strength and for this reason we re-plot the data in terms of the equivalent parallel resonant energy of an electron in first-order cyclotron resonance with a wave of a given frequency. We can interpret our findings in terms of the injected electron population and resonant ellipses in velocity space. Furthermore, we relate the findings of our study to observations of ducted waves seen on the ground as Substorm Chorus Events (SCEs) and conclude that the frequency dispersion seen in SCEs is dominated by electric field effects.

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