Development of a VLF noise storm and its relation to the dynamics of the magnetosphere during geomagnetic storms

Physics

Scientific paper

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Earth Magnetosphere, Magnetic Storms, Magnetospheric Instability, Noise Storms, Diurnal Variations, Radiation Belts, Space Plasmas, Very Low Frequencies

Scientific paper

It is demonstrated that two conditions must be fulfilled for the development of a VLF-hiss noise storm (f = 0.5-10 kHz): (1) the attainment of the threshold intensity of electrons fluxes with an energy greater than 40 keV in the plasma sheet; and (2) the presence of substorms leading to the expansion of this electron zone and its collision with the plasmaspheric cold plasma. At a fixed longitude, the noise storm commences at near-midnight hours irrespective of the magnetic storm phase; the duration of the noise storm has a direct linear relationship with the geomagnetic storm intensity.

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