An interpretation for the bipolar electric field structures parallel to the magnetic field observed in the auroral ionosphere
A physical model for the existence of bipolar structures in the electric field that are parallel to the magnetic field and observed in the auroral ionosphere, is established by deriving the "Sagdeev potential" from the two-fluid equations in a cylindrical coordinate system. The model sh...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2008-06-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/26/1431/2008/angeo-26-1431-2008.pdf |
| _version_ | 1819073091607724032 |
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| author | Jiankui Shi M. N. S. Qureshi K. Torkar M. Dunlop Zhenxing Liu T. L. Zhang |
| author_facet | Jiankui Shi M. N. S. Qureshi K. Torkar M. Dunlop Zhenxing Liu T. L. Zhang |
| author_sort | Jiankui Shi |
| collection | DOAJ |
| description | A physical model for the existence of bipolar structures in the electric
field that are parallel to the magnetic field and observed in the auroral
ionosphere, is established by deriving the "Sagdeev potential" from the
two-fluid equations in a cylindrical coordinate system. The model shows that
the bipolar electric field structure can develop not only from an ion
acoustic wave, but also from an ion cyclotron wave, when the Mach number and
the initial electric field satisfy certain conditions. Moreover, in the
auroral region, it shows that the polarity of this electric field structure
can be oriented either negative to positive or the reverse polarity, its
amplitude can be varied from 35 to 330 mV/m, and its duration can be 7 ms to 23 ms.
These results are in agreement with observation. Therefore, our
two-fluid model can interpret the bipolar structures observed in the auroral
ionosphere. |
| first_indexed | 2024-12-21T17:48:07Z |
| format | Article |
| id | doaj.art-894a5943fd82481eb3c3003bc7a73c0a |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-21T17:48:07Z |
| publishDate | 2008-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-894a5943fd82481eb3c3003bc7a73c0a2022-12-21T18:55:26ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762008-06-01261431143710.5194/angeo-26-1431-2008An interpretation for the bipolar electric field structures parallel to the magnetic field observed in the auroral ionosphereJiankui Shi0M. N. S. Qureshi1K. Torkar2M. Dunlop3Zhenxing Liu4T. L. Zhang5State Key Laboratory for Space Weather, CSSAR, Chinese Academy of Sciences, Beijing 100080, ChinaDepartment of Physics, Government College University, Lahore 54000, PakistanSpace Research Institute, Austrian Academy of Sciences, 8042, Graz, AustriaSSTD, Rutherford Appleton Laboratory, Chilton, Didcot, UKState Key Laboratory for Space Weather, CSSAR, Chinese Academy of Sciences, Beijing 100080, ChinaSpace Research Institute, Austrian Academy of Sciences, 8042, Graz, AustriaA physical model for the existence of bipolar structures in the electric field that are parallel to the magnetic field and observed in the auroral ionosphere, is established by deriving the "Sagdeev potential" from the two-fluid equations in a cylindrical coordinate system. The model shows that the bipolar electric field structure can develop not only from an ion acoustic wave, but also from an ion cyclotron wave, when the Mach number and the initial electric field satisfy certain conditions. Moreover, in the auroral region, it shows that the polarity of this electric field structure can be oriented either negative to positive or the reverse polarity, its amplitude can be varied from 35 to 330 mV/m, and its duration can be 7 ms to 23 ms. These results are in agreement with observation. Therefore, our two-fluid model can interpret the bipolar structures observed in the auroral ionosphere.https://www.ann-geophys.net/26/1431/2008/angeo-26-1431-2008.pdf |
| spellingShingle | Jiankui Shi M. N. S. Qureshi K. Torkar M. Dunlop Zhenxing Liu T. L. Zhang An interpretation for the bipolar electric field structures parallel to the magnetic field observed in the auroral ionosphere Annales Geophysicae |
| title | An interpretation for the bipolar electric field structures parallel to the magnetic field observed in the auroral ionosphere |
| title_full | An interpretation for the bipolar electric field structures parallel to the magnetic field observed in the auroral ionosphere |
| title_fullStr | An interpretation for the bipolar electric field structures parallel to the magnetic field observed in the auroral ionosphere |
| title_full_unstemmed | An interpretation for the bipolar electric field structures parallel to the magnetic field observed in the auroral ionosphere |
| title_short | An interpretation for the bipolar electric field structures parallel to the magnetic field observed in the auroral ionosphere |
| title_sort | interpretation for the bipolar electric field structures parallel to the magnetic field observed in the auroral ionosphere |
| url | https://www.ann-geophys.net/26/1431/2008/angeo-26-1431-2008.pdf |
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