تقرير
Quasi-periodic Fast-mode Wave Trains Within a Global EUV Wave and Sequential Transverse Oscillations Detected by SDO/AIA
| العنوان: | Quasi-periodic Fast-mode Wave Trains Within a Global EUV Wave and Sequential Transverse Oscillations Detected by SDO/AIA |
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| المؤلفون: | Liu, Wei, Ofman, Leon, Nitta, Nariaki V., Aschwanden, Markus J., Schrijver, Carolus J., Title, Alan M., Tarbell, Theodore D. |
| المصدر: | The Astrophysical Journal, Volume 753, Issue 1, article id. 52 (07/2012) |
| سنة النشر: | 2012 |
| المجموعة: | Astrophysics Physics (Other) |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics, Physics - Plasma Physics, Physics - Space Physics |
| الوصف: | We present the first unambiguous detection of quasi-periodic wave trains within the broad pulse of a global EUV wave (so-called "EIT wave") occurring on the limb. These wave trains, running ahead of the lateral CME front of 2-4 times slower, coherently travel to distances $>R_{sun}/2$ along the solar surface, with initial velocities up to 1400 km/s decelerating to ~650 km/s. The rapid expansion of the CME initiated at an elevated height of 110 Mm produces a strong downward and lateral compression, which may play an important role in driving the primary EUV wave and shaping its front forwardly inclined toward the solar surface. The waves have a dominant 2 min periodicity that matches the X-ray flare pulsations, suggesting a causal connection. The arrival of the leading EUV wave front at increasing distances produces an uninterrupted chain sequence of deflections and/or transverse (likely fast kink mode) oscillations of local structures, including a flux-rope coronal cavity and its embedded filament with delayed onsets consistent with the wave travel time at an elevated (by ~50%) velocity within it. This suggests that the EUV wave penetrates through a topological separatrix surface into the cavity, unexpected from CME caused magnetic reconfiguration. These observations, when taken together, provide compelling evidence of the fast-mode MHD wave nature of the {\it primary (outer) fast component} of a global EUV wave, running ahead of the {\it secondary (inner) slow} component of CME-caused restructuring. Comment: 17 pages, 12 figures; accepted by ApJ, April 24, 2012 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/0004-637X/753/1/52 |
| URL الوصول: | http://arxiv.org/abs/1204.5470 |
| رقم الأكسشن: | edsarx.1204.5470 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/0004-637X/753/1/52 |
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