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.
Журнал: ANNALES GEOPHYSICAE
Выпуск журнала: Vol. 38, Is. 3
Номера страниц: 765-774
ISSN журнала: 09927689
Место издания: GOTTINGEN
Издатель: COPERNICUS GESELLSCHAFT MBH
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