تقرير
Propagating Waves Transverse to the Magnetic Field in a Solar Prominence
| العنوان: | Propagating Waves Transverse to the Magnetic Field in a Solar Prominence |
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| المؤلفون: | Schmieder, B., Kucera, T. A., Knizhnik, K., Luna, M., Lopez-Ariste, A., Toot, D. |
| سنة النشر: | 2013 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | We report an unusual set of observations of waves in a large prominence pillar which consist of pulses propagating perpendicular to the prominence magnetic field. We observe a huge quiescent prominence with the Solar Dynamics Observatory (SDO) Atmospheric Imaging Assembly (AIA) in EUV on 2012 October 10 and only a part of it, the pillar, which is a foot or barb of the prominence, with the Hinode Solar Optical Telescope (SOT) (in Ca II and H\alpha lines), Sac Peak (in H\alpha, H\beta\ and Na-D lines), THEMIS ("T\'elescope H\'eliographique pour l' Etude du Magn\'etisme et des Instabilit\'es Solaires") with the MTR (MulTi-Raies) spectropolarimeter (in He D_3 line). The THEMIS/MTR data indicates that the magnetic field in the pillar is essentially horizontal and the observations in the optical domain show a large number of horizontally aligned features on a much smaller scale than the pillar as a whole. The data is consistent with a model of cool prominence plasma trapped in the dips of horizontal field lines. The SOT and Sac Peak data over the 4 hour observing period show vertical oscillations appearing as wave pulses. These pulses, which include a Doppler signature, move vertically, perpendicular to the field direction, along thin quasi-vertical columns in the much broader pillar. The pulses have a velocity of propagation of about 10 km/s, a period about 300 sec, and a wavelength around 2000 km. We interpret these waves in terms of fast magneto-sonic waves and discuss possible wave drivers. Comment: Accepted for publication in The Astrophysical Journal |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/0004-637X/777/2/108 |
| URL الوصول: | http://arxiv.org/abs/1309.1568 |
| رقم الأكسشن: | edsarx.1309.1568 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/0004-637X/777/2/108 |
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