Properties of EMIC Waves and EMIC Wave‐Driven Electron Precipitation in Subauroral Latitudes Observed at Athabasca, Canada
Rattachement africain : jp, ca. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Abstract Electromagnetic ion cyclotron (EMIC) waves are believed to cause the loss of relativistic electrons from the outer radiation belt into the atmosphere due to pitch angle scattering. However, it is still unclear whether all EMIC waves can scatter relativistic electrons or which conditions are favorable for pitch angle scattering by EMIC waves. In this study, we performed a 2‐year data analysis of EMIC waves and EMIC wave‐driven electron precipitation (EP), from 1 November 2016–31 October 2018. Electromagnetic ion cyclotron waves were observed using a ground‐based magnetometer installed at Athabasca (ATH, 4.3), Canada. Electron precipitation events were identified from very low‐frequency radio waves propagated from the transmitters at North Dakota (NDK, 3.0) and Seattle (NLK, 2.9) stations in USA to the receiver installed at ATH. The magnetic local time dependence of EMIC waves showed higher occurrence rates in the dawn sector. In contrast, EMIC waves accompanied by EP were localized in the dusk sector and were likely to occur during geomagnetic substorms. We found that EMIC waves accompanied by EP were associated with the main phase of geomagnetic storms and occurred inside the plasmapause. These results suggest that the EMIC waves that cause EP occur in the overlap region between the ring current and dense cold plasma during the main phase of geomagnetic storms. This is consistent with previous studies describing that the electron resonant energy with EMIC waves is lower in regions with high plasma density.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Properties of EMIC Waves and EMIC Wave‐Driven Electron Precipitation in Subauroral Latitudes Observed at Athabasca, Canada
- Date Crossref
- 01/03/2025
- Éditeur
- American Geophysical Union (AGU)
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Tohoku University pays non établi dans la noticeUniversité ou école supérieure
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Nagoya University pays non établi dans la noticeUniversité ou école supérieure
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Kanazawa University pays non établi dans la noticeUniversité ou école supérieure
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Kyoto University pays non établi dans la noticeUniversité ou école supérieure
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Chiba University pays non établi dans la noticeUniversité ou école supérieure
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Athabasca University pays non établi dans la noticeUniversité ou école supérieure
Tohoku University, Nagoya University et Kanazawa University, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.