Generation of resonant Alfvén waves in the auroral oval
Many independent observations have shown that resonant field line Pc5 pulsations (typical periods of about several minutes) are preferably excited inside the auroral oval. Consideration of the most evident interpretation schemes shows that there is no simple explanation of this effect. Here we con...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2016-02-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/34/241/2016/angeo-34-241-2016.pdf |
| _version_ | 1818379502009450496 |
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| author | V. A. Pilipenko V. A. Pilipenko D. Yu. Klimushkin P. N. Mager M. J. Engebretson O. V. Kozyreva O. V. Kozyreva |
| author_facet | V. A. Pilipenko V. A. Pilipenko D. Yu. Klimushkin P. N. Mager M. J. Engebretson O. V. Kozyreva O. V. Kozyreva |
| author_sort | V. A. Pilipenko |
| collection | DOAJ |
| description | Many independent observations have shown that resonant field line Pc5
pulsations (typical periods of about several minutes) are preferably excited inside the auroral oval. Consideration of the most evident interpretation schemes
shows that there is no simple explanation of this effect. Here we consider
theoretically the generation of toroidal Pc5 Alfvén waves by fluctuating
magnetospheric field-aligned currents. It is shown that the Alfvén wave
latitudinal structure has the same features as in the case of the classical
field line resonance driven by external sources: a peak localized in latitude
and a 180° phase shift across the resonant magnetic shell. This model
suggests an additional mechanism of ultra-low-frequency (ULF) wave excitation
which can operate at auroral latitudes. |
| first_indexed | 2024-12-14T02:03:48Z |
| format | Article |
| id | doaj.art-4d275f45ff1a4da9be204532770fba24 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-14T02:03:48Z |
| publishDate | 2016-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-4d275f45ff1a4da9be204532770fba242022-12-21T23:20:57ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762016-02-013424124810.5194/angeo-34-241-2016Generation of resonant Alfvén waves in the auroral ovalV. A. Pilipenko0V. A. Pilipenko1D. Yu. Klimushkin2P. N. Mager3M. J. Engebretson4O. V. Kozyreva5O. V. Kozyreva6Institute of Physics of the Earth, 123242 Moscow, RussiaSpace Research Institute, 117997 Moscow, RussiaInstitute of Solar-Terrestrial Physics, 664033 Irkutsk, RussiaInstitute of Solar-Terrestrial Physics, 664033 Irkutsk, RussiaAugsburg College, Minneapolis, MN 55454, USAInstitute of Physics of the Earth, 123242 Moscow, RussiaSpace Research Institute, 117997 Moscow, RussiaMany independent observations have shown that resonant field line Pc5 pulsations (typical periods of about several minutes) are preferably excited inside the auroral oval. Consideration of the most evident interpretation schemes shows that there is no simple explanation of this effect. Here we consider theoretically the generation of toroidal Pc5 Alfvén waves by fluctuating magnetospheric field-aligned currents. It is shown that the Alfvén wave latitudinal structure has the same features as in the case of the classical field line resonance driven by external sources: a peak localized in latitude and a 180° phase shift across the resonant magnetic shell. This model suggests an additional mechanism of ultra-low-frequency (ULF) wave excitation which can operate at auroral latitudes.https://www.ann-geophys.net/34/241/2016/angeo-34-241-2016.pdf |
| spellingShingle | V. A. Pilipenko V. A. Pilipenko D. Yu. Klimushkin P. N. Mager M. J. Engebretson O. V. Kozyreva O. V. Kozyreva Generation of resonant Alfvén waves in the auroral oval Annales Geophysicae |
| title | Generation of resonant Alfvén waves in the auroral oval |
| title_full | Generation of resonant Alfvén waves in the auroral oval |
| title_fullStr | Generation of resonant Alfvén waves in the auroral oval |
| title_full_unstemmed | Generation of resonant Alfvén waves in the auroral oval |
| title_short | Generation of resonant Alfvén waves in the auroral oval |
| title_sort | generation of resonant alfven waves in the auroral oval |
| url | https://www.ann-geophys.net/34/241/2016/angeo-34-241-2016.pdf |
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