Bayesian evidence for two slow-wave damping models in hot coronal loops

被引:5
|
作者
Arregui, I. [1 ,2 ]
Kolotkov, D. Y. [3 ,4 ]
Nakariakov, V. M. [3 ,5 ]
机构
[1] Inst Astrofis Canarias, San Cristobal la Laguna 38205, Tenerife, Spain
[2] Univ La Laguna, Dept Astrofis, San Cristobal la Laguna 38206, Tenerife, Spain
[3] Univ Warwick, Ctr Fus Space & Astrophys, Phys Dept, Coventry CV4 7AL, England
[4] Ventspils Univ Appl Sci, Ventspils Int Radio Astron Ctr VIRAC, Engn Res Inst, Inzenieru Iela 101, LV-3601 Ventspils, Latvia
[5] Univ Bernardo OHiggins, Ctr Invest Astron, Ave Viel 1497, Santiago, Chile
基金
美国国家航空航天局;
关键词
magnetohydrodynamics (MHD); methods: statistical; Sun: corona; Sun: oscillations; DOPPLER-SHIFT OSCILLATIONS; BRAGG CRYSTAL SPECTROMETER; MAGNETOACOUSTIC WAVES; COMPRESSIVE VISCOSITY; THERMAL-CONDUCTIVITY; STANDING WAVES; SOLAR; SUMER; PHASE;
D O I
10.1051/0004-6361/202346834
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We computed the evidence in favour of two models, one based on field-aligned thermal conduction alone and another that includes thermal misbalance as well, to explain the damping of slow magneto-acoustic waves in hot coronal loops. Our analysis is based on the computation of the marginal likelihood and the Bayes factor for the two damping models. We quantified their merit to explain the apparent relationship between slow mode periods and damping times, measured with SOHO/SUMER in a set of hot coronal loops. The results indicate evidence in favour of the model with thermal misbalance in the majority of the sample, with a small population of loops for which thermal conduction alone is more plausible. The apparent possibility of two different regimes of slow-wave damping, if due to differences between the loops of host active regions and/or the photospheric dynamics, may help to reveal the coronal heating mechanism.
引用
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页数:5
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