Oscillations of a Giant Solar Tornado | ||
| Iranian Journal of Astronomy and Astrophysics | ||
| مقاله 5، دوره 4، شماره 3، اسفند 2017، صفحه 261-271 اصل مقاله (3.6 M) | ||
| شناسه دیجیتال (DOI): 10.22128/ijaa.2017.126 | ||
| نویسندگان | ||
| Fatemeh Hashemi-Nasab1؛ Neda Dadashi2؛ Nasibeh Alipour-Rad1؛ YousefAli Abedini1 | ||
| 1Department of Physics, University of Zanjan, P.O. Box 45195-313, Zanjan, Iran | ||
| 2Physics Department, Faculty of Science, University of Zanjan, Zanjan, Iran | ||
| چکیده | ||
| Solar magnetic tornadoes are known to be one of the mass and energy transport mechanisms from the lower solar atmosphere into the upper layers of the solar corona. A bright spiral structure with two arms is observed using high-cadence EUV images of 171, 193 and 304 Ǻ channels of Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory (SDO) on 10th of July 2011 for three hours. The structure studied here looks bright in front of dark background emissions. The rotational energy budget of this tornado is estimated using three different approaches. Results showed the rotational energy ranges between 1.95×1018 erg to 3.36×1019 erg. After correcting for the solar differential rotation, the oscillatory behaviour of the structure is studied using FFT technique. Results show four different regimes of oscillations: 3-min, 5-6 min, 8-11 min, and 15-17 min. The showed origin of each of these oscillations are discussed. | ||
| کلیدواژهها | ||
| Sun: Corona؛ Sun: Tornado؛ Sun: UV radiation؛ Sun: Oscillations | ||
| مراجع | ||
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