دورية أكاديمية
The ionospheric response to flux transfer events: the first few minutes
| العنوان: | The ionospheric response to flux transfer events: the first few minutes |
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| المؤلفون: | A. S. Rodger, M. Pinnock |
| المصدر: | Annales Geophysicae, Vol 15, Pp 685-691 (1997) |
| بيانات النشر: | Copernicus Publications, 1997. |
| سنة النشر: | 1997 |
| المجموعة: | LCC:Science LCC:Physics LCC:Geophysics. Cosmic physics |
| مصطلحات موضوعية: | Science, Physics, QC1-999, Geophysics. Cosmic physics, QC801-809 |
| الوصف: | We utilise high-time resolution measurements from the PACE HF radar at Halley, Antarctica to explore the evolution of the ionospheric response during the first few minutes after enhanced reconnection occurs at the magnetopause. We show that the plasma velocity increases associated with flux transfer events (FTEs) occur first ~100–200 km equatorward of the region to which magnetosheath (cusp) precipitation maps to the ionosphere. We suggest that these velocity variations start near the ionospheric footprint of the boundary between open and closed magnetic field lines. We show that these velocity variations have rise times ~100 s and fall times of ~10 s. When these velocity transients reach the latitude of the cusp precipitation, sometimes the equatorward boundary of the precipitation begins to move equatorward, the expected and previously reported ionospheric signature of enhanced reconnection. A hypothesis is proposed to explain the velocity variations. It involves the rapid outflow of magnetospheric electrons into the magnetosheath along the most recently reconnected field lines. Several predictions are made arising from the proposed explanation which could be tested with ground-based and space-based observations. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 0992-7689 1432-0576 |
| Relation: | https://www.ann-geophys.net/15/685/1997/angeo-15-685-1997.pdf; https://doaj.org/toc/0992-7689; https://doaj.org/toc/1432-0576 |
| DOI: | 10.1007/s00585-997-0685-y |
| URL الوصول: | https://doaj.org/article/0906d06c59a04326b1cc1f388b8709f3 |
| رقم الأكسشن: | edsdoj.0906d06c59a04326b1cc1f388b8709f3 |
| قاعدة البيانات: | Directory of Open Access Journals |
Find this article in full text from Springer Verlag. 
Full Text Finder | تدمد: | 09927689 14320576 |
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| DOI: | 10.1007/s00585-997-0685-y |