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Ann. Geophys., 21, 2293-2302, 2003
www.ann-geophys.net/21/2293/2003/
© European Geosciences Union 2003
Magion 5 observations of chorus-like emissions and their propagation features as inferred from ray-tracing simulation
J. Chum1, F. Jiříček1, J. Šmilauer1, and D. Shklyar2
1Institute of Atmospheric Physics, Bocni II/1401, 14131 Praha 4, Czech Republic
2IZMIRAN, Troitsk, Moscow Region, 142190, Russia
Abstract. After reviewing briefly the present state of
knowledge about chorus-like emissions, we present an overview of Magion 5
satellite observations of these emissions in the inner magnetosphere of the
Earth. From the extensive VLF data recorded on board the Magion 5 satellite, we
show examples of different types of discrete elements, representing rising and
falling tones, and discuss their spectral properties, such as the bandwidth and
the characteristic frequency as compared to the equatorial electron
gyrofrequency. We analyse the possibility of satellite observation of discrete
elements, assuming nonducted wave propagation from the source. As for the
characteristic dimension of the generation region, we apply the figures
obtained from the recently published correlation analysis of chorus emission
recorded by four satellites in the Cluster experiment. We conclude that
different frequencies in the chorus element should be emitted in a certain span
of wave normal angles, so that the whole element could be observed far from the
generation region.
Key words. Magnetospheric physics (plasmasphere;
plasma waves and instabilities) – Space plasma physics (wave-particle interactions)
– Ionosphere (wave propagation)
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