Academic Journal
Spatial structures of magnetic depression in the Earth's high-altitude cusp: Cluster multipoint observations
| العنوان: | Spatial structures of magnetic depression in the Earth's high-altitude cusp: Cluster multipoint observations |
|---|---|
| المؤلفون: | Shi, Q. Q., Pu, Z. Y., Soucek, J., Zong, Q.G., Xie, L., Chen, Y., Zhang, H., Li, L., Xia, L. D., Liu, Z. X., Lucek, E., Fazakerley, A. N., Reme, H. |
| المساهمون: | Shi, QQ (reprint author), Peking Univ, Inst Space Phys & Appl Technol, Beijing 100871, Peoples R China., Peking Univ, Inst Space Phys & Appl Technol, Beijing 100871, Peoples R China., Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England., Shandong Univ, Sch Space Sci & Phys, Weihai 264209, Shandong, Peoples R China., Chinese Acad Sci, Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100080, Peoples R China., Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Space & Atmospher Phys Grp, London SW7 2AZ, England., Univ Toulouse 3, Ctr Etud Spatiale Rayonnements, F-31028 Toulouse, France., Acad Sci Czech Republic, Inst Atmospher Phys, Dept Space Phys, Prague 11720, Czech Republic., NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA., CNRS, UMR 5187, Toulouse, France. |
| المصدر: | SCI |
| بيانات النشر: | journal of geophysical research space physics |
| سنة النشر: | 2009 |
| المجموعة: | Peking University Institutional Repository (PKU IR) / 北京大学机构知识库 |
| مصطلحات موضوعية: | MIRROR-MODE STRUCTURES, LINEAR INSTABILITY, HYBRID SIMULATIONS, SOLAR-WIND, MAGNETOSHEATH, FIELD, MAGNETOSPHERE, HOLES, IDENTIFICATION, SPACECRAFT |
| الوصف: | Magnetic depression structures (magnetic holes) of short time duration from seconds to minutes have been studied using Cluster data in the high-latitude cusp. Our multispacecraft analysis revealed that the magnetic depressions are spatial structures traveling across the spacecraft, and this result was further strengthened by the calculation of the boundary normal directions and velocities using various methods. In this article, we show that multiple properties of the magnetic depressions are consistent with those of mirror structures observed in the magnetosheath or solar wind. The plasma in the cusp is rarely unstable with respect to mirror instability. However, as has been shown by previous studies, once a large magnetic hole is created by mirror instability, it becomes relatively stable and can survive for extended periods of time even if surrounding plasma conditions drop well below the mirror threshold. Although local generation of these structures cannot be completely ruled out in some cases, we propose an interpretation of the magnetic depressions observed in the cusp as mirror structures generated upstream and convected to the cusp by plasma flow. Specifically, the magnetic holes could be generated in the magnetosheath and enter the cusp due to the open geometry of the cusp magnetic field. ; Astronomy & Astrophysics ; SCI(E) ; 14 ; ARTICLE ; null ; 114 |
| نوع الوثيقة: | journal/newspaper |
| اللغة: | English |
| تدمد: | 2169-9380 |
| Relation: | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS.2009,114.; 938996; http://hdl.handle.net/20.500.11897/148843; WOS:000270707200001 |
| DOI: | 10.1029/2009JA014283 |
| الاتاحة: | https://hdl.handle.net/20.500.11897/148843 https://doi.org/10.1029/2009JA014283 |
| رقم الانضمام: | edsbas.7FFE9A71 |
| قاعدة البيانات: | BASE |
| تدمد: | 21699380 |
|---|---|
| DOI: | 10.1029/2009JA014283 |