Low-altitude frequency-banded equatorial emissions observed below the electron cyclotron frequency
<p>The ICE (Instrument Champ Électrique) 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 <span class="in...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2020-06-01
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| Series: | Annales Geophysicae |
| Online Access: | https://angeo.copernicus.org/articles/38/765/2020/angeo-38-765-2020.pdf |
| _version_ | 1818983476002553856 |
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| author | M. Y. Boudjada P. H. M. Galopeau S. Sawas V. Denisenko V. Denisenko K. Schwingenschuh H. Lammer H. U. Eichelberger W. Magnes B. Besser |
| author_facet | M. Y. Boudjada P. H. M. Galopeau S. Sawas V. Denisenko V. Denisenko K. Schwingenschuh H. Lammer H. U. Eichelberger W. Magnes B. Besser |
| author_sort | M. Y. Boudjada |
| collection | DOAJ |
| description | <p>The ICE (Instrument Champ Électrique) 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 <span class="inline-formula"><i>≳</i></span> 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<span class="inline-formula"><sup>∘</sup></span>. 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 poleward of the plasmapause where the ratio of the plasma frequency to gyro-frequency is smaller than one.</p> |
| first_indexed | 2024-12-20T18:03:43Z |
| format | Article |
| id | doaj.art-8d2511587e7f4a6bae42dccc16790fb3 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-20T18:03:43Z |
| publishDate | 2020-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-8d2511587e7f4a6bae42dccc16790fb32022-12-21T19:30:36ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762020-06-013876577410.5194/angeo-38-765-2020Low-altitude frequency-banded equatorial emissions observed below the electron cyclotron frequencyM. Y. Boudjada0P. H. M. Galopeau1S. Sawas2V. Denisenko3V. Denisenko4K. Schwingenschuh5H. Lammer6H. U. Eichelberger7W. Magnes8B. Besser9Space Research Institute, Austrian Academy of Sciences, Graz, AustriaLATMOS-CNRS, Université Versailles Saint-Quentin-en-Yvelines, Guyancourt, FranceInstitute of Communications and Wave Propagation, Graz University of Technology, Graz, AustriaInstitute of Computational Modelling, Russian Academy of Sciences, Krasnoyarsk, RussiaSiberian Federal University, Krasnoyarsk, RussiaSpace Research Institute, Austrian Academy of Sciences, Graz, AustriaSpace Research Institute, Austrian Academy of Sciences, Graz, AustriaSpace Research Institute, Austrian Academy of Sciences, Graz, AustriaSpace Research Institute, Austrian Academy of Sciences, Graz, AustriaSpace Research Institute, Austrian Academy of Sciences, Graz, Austria<p>The ICE (Instrument Champ Électrique) 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 <span class="inline-formula"><i>≳</i></span> 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<span class="inline-formula"><sup>∘</sup></span>. 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 poleward of the plasmapause where the ratio of the plasma frequency to gyro-frequency is smaller than one.</p>https://angeo.copernicus.org/articles/38/765/2020/angeo-38-765-2020.pdf |
| spellingShingle | M. Y. Boudjada P. H. M. Galopeau S. Sawas V. Denisenko V. Denisenko K. Schwingenschuh H. Lammer H. U. Eichelberger W. Magnes B. Besser Low-altitude frequency-banded equatorial emissions observed below the electron cyclotron frequency Annales Geophysicae |
| title | Low-altitude frequency-banded equatorial emissions observed below the electron cyclotron frequency |
| title_full | Low-altitude frequency-banded equatorial emissions observed below the electron cyclotron frequency |
| title_fullStr | Low-altitude frequency-banded equatorial emissions observed below the electron cyclotron frequency |
| title_full_unstemmed | Low-altitude frequency-banded equatorial emissions observed below the electron cyclotron frequency |
| title_short | Low-altitude frequency-banded equatorial emissions observed below the electron cyclotron frequency |
| title_sort | low altitude frequency banded equatorial emissions observed below the electron cyclotron frequency |
| url | https://angeo.copernicus.org/articles/38/765/2020/angeo-38-765-2020.pdf |
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