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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-48
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-48
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 03 Apr 2019

Regular paper | 03 Apr 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

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

Mohammed Y. Boudjada1, Patrick H. M. Galopeau2, Sami Sawas3, Valery Denisenko4,5, Konrad Schwingenschuh1, Helmut Lammer1, Hans U. Eichelberger1, Werner Magnes1, and Bruno Besser1 Mohammed Y. Boudjada et al.
  • 1Space Research Institute, Austrian Academy of Sciences, Graz, Austria
  • 2LATMOS-CNRS, Université Versailles Saint-Quentin-en-Yvelines, Guyancourt, France
  • 3Institute of Communications and Wave Propagation, University of Technology, Graz, Austria
  • 4Institute of Computational Modelling, Russian Academy of Sciences, Krasnoyarsk, Russia
  • 5Siberian Federal University, Krasnoyarsk, Russia

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 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 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.

Mohammed Y. Boudjada et al.
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