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Terrestrial kilometric radiation observed on pre-midnight side of the Earth at 1-2 L-Shell

Abstract : The ICE experiment onboard the DEMETER satellite recorded kilometric emissions in the vicinity of the magnetic equatorial plane. Those radiations were observed in the beginning of the year 2010 on the night-side of the Earth and rarely on the day-side. We distinguish two components one appears as a continuum between few kHz and up to 50 kHz and the other one from 50 kHz to 800 kHz. The first component exhibits positive and negative frequency drift rates in the southern and northern hemispheres, at latitudes between 40 • and 20 •. The second component displays multiple spaced frequency bands. Such bands 5 mainly occur near the magnetic equatorial plane with a particular enhancement of the power level when the satellite latitude is close to the magnetic equatorial plane. We show in this study that both components are linked to the terrestrial non-thermal kilometric radiation. Those two components are the trapped and the escaping terrestrial non-thermal kilometric radiation. Above 150 kHz, we have found that the escaping emissions are mainly extended in frequency in the southern hemisphere and in geomagnetic latitude in the opposite hemisphere. DEMETER low altitude orbits lead to describe the frequency and the time 10 evolution of this terrestrial radiation particularly on the evening sector at L-Shell of about 2. We show the dependence of the power intensity on the emission frequency, and provide a hint on the location of the source region and its relation to the Earth's plasmasphere. It is shown that the so-called 'Christmas-tree' pattern associated to the terrestrial kilometric radiation may be associated to the plume and channel generated in the pre-midnight sector of the plasmasphere.
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Mohammed Y. Boudjada, Patrick H. M. Galopeau, Sami Sawas, Valery Denisenko, Konrad Schwingenschuh, et al.. Terrestrial kilometric radiation observed on pre-midnight side of the Earth at 1-2 L-Shell. Annales Geophysicae, European Geosciences Union, In press, ⟨10.5194/angeo-2019-48⟩. ⟨insu-02090446⟩



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