Low Frequency Plasma Waves in the Polar Cusp

Details Low Frequency Plasma Waves in the Polar Cusp Low Frequency Plasma Waves in the Polar Cusp

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm32c..02b&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM32C-02

Physics

2724 Magnetopause, Cusp, And Boundary Layers

Scientific paper

The polar cusp is the region in the plasma environment of the Earth where intensive conversion of energy takes place. Low frequency plasma waves which can control the dynamics of the ions in collision free plasma play very important role in the formation and behaviour of this region. This paper presents the review of the observations of the low frequency plasma waves together with plasma particles which were done by Interball- 1, Magion-4 and Magion -5 satellites in the different cusp regions. There are observed the accelerated plasma particles, hot electron populations and very strong wave activity, particularly at the low frequencies. The detailed study of the wave spectra together with the distribution function for electrons indicate the correlation between presence of the lower-hybrid waves and the population of the particles with higher energy then in the surrounding space. These experimental facts suggest that strong coupling between waves and particles is responsible for plasma heating. During polar cusp crossing by INTERBALL 1 and Magion 5 the wave form has been transmitted occasionally by MIF and ULF experiments. The FFT analysis indicated many bursts of ULF emissions in both electric and magnetic components. These waves has highly non stationary characters. To study the dynamics of changes in the spectral characteristics of the waves the wavelet analysis has been used. In this presentation the results of the analysis for selected cusp crossings at different altitudes will be given. Some examples of wave activity registered by CLUSTER satellites in the polar cusp will be additionaly presented.

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