Low-altitude frequency-banded equatorial emissions observed below the electron cyclotron frequency : научное издание | Научно-инновационный портал СФУ

Low-altitude frequency-banded equatorial emissions observed below the electron cyclotron frequency : научное издание

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.5194/angeo-38-765-2020

Аннотация: The ICE (Instrument Champ Electrique) experiment on board the DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) satellite recorded frequency-banded wave emissions below the electron cyclotron frequency, with band spacing greater than or similar to frequency low-hybrid resonance, in the vicinity of the magnetic equatorial plane. Those radiations were observed in the beginning of the year 2010 on the night side of Earth and rarely on the day side. We distinguish two components: one appears as frequency bands continuous in time between a few kilohertz and up to 50 kHz, and the other one is from 50 to 800 kHz. The first component exhibits positive and negative frequency drift rates in the Southern Hemisphere and Northern Hemisphere, at latitudes between 40 and 20 degrees. The second one 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 the similarities and the discrepancies between the non-free-space DEMETER frequency-banded emissions and the well-known free-space terrestrial kilometric radiation. The hollow cones of the DEMETER frequency-banded wave emissions are oriented towards Earth's ionosphere. We suggest that the source region is localized in regions pole-ward of the plasmapause where the ratio of the plasma frequency to gyro-frequency is smaller than one.

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Издание

Журнал: ANNALES GEOPHYSICAE

Выпуск журнала: Vol. 38, Is. 3

Номера страниц: 765-774

ISSN журнала: 09927689

Место издания: GOTTINGEN

Издатель: COPERNICUS GESELLSCHAFT MBH

Авторы

  • Boudjada Mohammed Y. (Austrian Acad Sci, Space Res Inst, Graz, Austria)
  • Galopeau Patrick H. M. (Univ Versailles St Quentin En Yvelines, CNRS, LATMOS, Guyancourt, France)
  • Sawas Sami (Graz Univ Technol, Inst Commun & Wave Propagat, Graz, Austria)
  • Denisenko Valery V. (Russian Acad Sci, Inst Computat Modelling, Krasnoyarsk, Russia; Siberian Fed Univ, Krasnoyarsk, Russia)
  • Schwingenschuh Konrad (Austrian Acad Sci, Space Res Inst, Graz, Austria)
  • Lammer Helmut (Austrian Acad Sci, Space Res Inst, Graz, Austria)
  • Eichelberger Hans U. (Austrian Acad Sci, Space Res Inst, Graz, Austria)
  • Magnes Werner (Austrian Acad Sci, Space Res Inst, Graz, Austria)
  • Besser Bruno (Austrian Acad Sci, Space Res Inst, Graz, Austria)

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