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The temporal evolution of substorm-enhanced whistler-mode waves: relationship between space-based observations, ground-based observations and energetic electrons

Abel, G.A.; Smith, A.J.; Meredith, N.P.; Anderson, R.R.. 2004 The temporal evolution of substorm-enhanced whistler-mode waves: relationship between space-based observations, ground-based observations and energetic electrons. Journal of Geophysical Research, 109 (A10), A10207. 11, pp. 10.1029/2004JA010407

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Abstract/Summary

[1] We examine 22 case studies of CRRES satellite observations of substorm-enhanced whistler-mode waves. These observations were made close to the geomagnetic equator and between 0200 and 0600 MLT. The frequency of the enhanced whistler-mode waves is seen to vary strongly with magnetic field strength, and for this reason we 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. No consistent increase or decrease of the equivalent parallel resonant energy of the substorm-enhanced whistler-mode waves with time is seen; rather the typical behavior is that it remains constant with time. We interpret our findings in terms of the injected electron population and resonance 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.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2004JA010407
Programmes: BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Magnetic Reconnection, Substorms and their Consequences
ISSN: 0148-0227
Additional Keywords: Substorms;
NORA Subject Terms: Atmospheric Sciences
Date made live: 17 Aug 2010 11:05
URI: http://nora.nerc.ac.uk/id/eprint/10108

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