Arase In Situ Observations of High‐Frequency Electromagnetic Ion Cyclotron (EMIC) Waves in Regions Close to the Earth During the May 2024 Storm
Abstract During the May 2024 storm, the minimum Dst index was approximately −412 nT, marking the largest geomagnetic storm of the past decade. This event caused the inner edge of the ring current to penetrate deeply into the inner magnetosphere during the main phase of the storm. We present observat...
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Wiley
2025-04-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL112489 |
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| author | C.‐W. Jun Y. Miyoshi T. Hori N. Kitamura K.‐H. Kim J.‐H. Lee J. Bortnik L. Lyons I. Shinohara A. Matsuoka Y. Kasahara S. Matsuda Y. Kasaba M. Teramoto K. Yamamoto A. Shinbori |
| author_facet | C.‐W. Jun Y. Miyoshi T. Hori N. Kitamura K.‐H. Kim J.‐H. Lee J. Bortnik L. Lyons I. Shinohara A. Matsuoka Y. Kasahara S. Matsuda Y. Kasaba M. Teramoto K. Yamamoto A. Shinbori |
| author_sort | C.‐W. Jun |
| collection | DOAJ |
| description | Abstract During the May 2024 storm, the minimum Dst index was approximately −412 nT, marking the largest geomagnetic storm of the past decade. This event caused the inner edge of the ring current to penetrate deeply into the inner magnetosphere during the main phase of the storm. We present observations of high‐frequency electromagnetic ion cyclotron (HF EMIC) wave activity during this intense geomagnetic storm using data from the Arase satellite. Arase observations showed that HF EMIC waves with frequencies of 5–36 Hz at L ∼ 2, occurred mainly during the main and early‐recovery phases. The minimum resonance energy of energetic protons and relativistic electrons associated with HF EMIC waves suggests their potential to cause the loss of relativistic electrons in the low L‐shell region. Our observations provide new insights into the generation of EMIC waves and the dynamics of energetic particles at low L‐shells in the inner magnetosphere. |
| format | Article |
| id | doaj-art-6f19ddc5f2fe4be3b244faf76466aa63 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-6f19ddc5f2fe4be3b244faf76466aa632025-08-20T03:10:11ZengWileyGeophysical Research Letters0094-82761944-80072025-04-01527n/an/a10.1029/2024GL112489Arase In Situ Observations of High‐Frequency Electromagnetic Ion Cyclotron (EMIC) Waves in Regions Close to the Earth During the May 2024 StormC.‐W. Jun0Y. Miyoshi1T. Hori2N. Kitamura3K.‐H. Kim4J.‐H. Lee5J. Bortnik6L. Lyons7I. Shinohara8A. Matsuoka9Y. Kasahara10S. Matsuda11Y. Kasaba12M. Teramoto13K. Yamamoto14A. Shinbori15Institute for Space‐Earth Environmental Research (ISEE) Nagoya University Nagoya JapanInstitute for Space‐Earth Environmental Research (ISEE) Nagoya University Nagoya JapanInstitute for Space‐Earth Environmental Research (ISEE) Nagoya University Nagoya JapanInstitute for Space‐Earth Environmental Research (ISEE) Nagoya University Nagoya JapanKyung‐Hee University Suwon KoreaKorea Astronomy and Space Science Institute Daejeon KoreaAtmospheric and Oceanic Sciences University of California Los Angeles Los Angeles CA USAAtmospheric and Oceanic Sciences University of California Los Angeles Los Angeles CA USAInstitute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara JapanKyoto University Kyoto JapanGraduate School of Natural Science and Technology Kanazawa University Kanazawa JapanGraduate School of Natural Science and Technology Kanazawa University Kanazawa JapanPlanetary Plasma and Atmospheric Research Center (PPARC) Graduate School of Science Tohoku University Sendai JapanKyushu Institute of Technology Iizuka JapanInstitute for Space‐Earth Environmental Research (ISEE) Nagoya University Nagoya JapanInstitute for Space‐Earth Environmental Research (ISEE) Nagoya University Nagoya JapanAbstract During the May 2024 storm, the minimum Dst index was approximately −412 nT, marking the largest geomagnetic storm of the past decade. This event caused the inner edge of the ring current to penetrate deeply into the inner magnetosphere during the main phase of the storm. We present observations of high‐frequency electromagnetic ion cyclotron (HF EMIC) wave activity during this intense geomagnetic storm using data from the Arase satellite. Arase observations showed that HF EMIC waves with frequencies of 5–36 Hz at L ∼ 2, occurred mainly during the main and early‐recovery phases. The minimum resonance energy of energetic protons and relativistic electrons associated with HF EMIC waves suggests their potential to cause the loss of relativistic electrons in the low L‐shell region. Our observations provide new insights into the generation of EMIC waves and the dynamics of energetic particles at low L‐shells in the inner magnetosphere.https://doi.org/10.1029/2024GL112489high‐frequency electromagnetic ion cyclotron wavesArase in situ observationsthe May 2024 stormEMIC waves in the deep inner magnetosphere |
| spellingShingle | C.‐W. Jun Y. Miyoshi T. Hori N. Kitamura K.‐H. Kim J.‐H. Lee J. Bortnik L. Lyons I. Shinohara A. Matsuoka Y. Kasahara S. Matsuda Y. Kasaba M. Teramoto K. Yamamoto A. Shinbori Arase In Situ Observations of High‐Frequency Electromagnetic Ion Cyclotron (EMIC) Waves in Regions Close to the Earth During the May 2024 Storm Geophysical Research Letters high‐frequency electromagnetic ion cyclotron waves Arase in situ observations the May 2024 storm EMIC waves in the deep inner magnetosphere |
| title | Arase In Situ Observations of High‐Frequency Electromagnetic Ion Cyclotron (EMIC) Waves in Regions Close to the Earth During the May 2024 Storm |
| title_full | Arase In Situ Observations of High‐Frequency Electromagnetic Ion Cyclotron (EMIC) Waves in Regions Close to the Earth During the May 2024 Storm |
| title_fullStr | Arase In Situ Observations of High‐Frequency Electromagnetic Ion Cyclotron (EMIC) Waves in Regions Close to the Earth During the May 2024 Storm |
| title_full_unstemmed | Arase In Situ Observations of High‐Frequency Electromagnetic Ion Cyclotron (EMIC) Waves in Regions Close to the Earth During the May 2024 Storm |
| title_short | Arase In Situ Observations of High‐Frequency Electromagnetic Ion Cyclotron (EMIC) Waves in Regions Close to the Earth During the May 2024 Storm |
| title_sort | arase in situ observations of high frequency electromagnetic ion cyclotron emic waves in regions close to the earth during the may 2024 storm |
| topic | high‐frequency electromagnetic ion cyclotron waves Arase in situ observations the May 2024 storm EMIC waves in the deep inner magnetosphere |
| url | https://doi.org/10.1029/2024GL112489 |
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