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Period ratios for standing kink and sausage modes in magnetized structures with siphon flow on the Sun
Yu Hui; Chen ShaoXia; Li Bo; Xia LiDong
2016
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume16Issue:6
AbstractStanding oscillations with multiple periods have been found in a number of atmospheric structures on the Sun. The ratio of the period of the fundamental to twice the one of its first overtone, P-1/2P(2), is important in applications of solar magneto-seismology. We examine how field-aligned flows impact P-1/2P(2) of standingmodes in solar magnetic cylinders. For coronal loops, the flow effects are significant for both fast kink and sausage modes. For kink modes, they reduce P-1/2P(2) by up to 17% relative to the static case even when the density contrast between the loop and its surroundings approaches infinity. For sausage modes, the reduction in P-1/2P(2) due to flow is typically less than or similar to 5.5% compared with the static case. However, the threshold aspect ratio, only above which can trapped sausage modes be supported, may increase dramatically with the flow magnitude. For photospheric tubes, the flow effect on P-1/2P(2) is not as strong. However, when applied to sausage modes, introducing field-aligned flows offers more possibilities in interpreting the multiple periods that have recently been measured. We conclude that field-aligned flows should be taken into account to help better understand what causes the departure of P-1/2P(2) from unity.
KeywordCORONAL LOOP OSCILLATIONS HYDROMAGNETIC SURFACE-WAVES CYLINDRICAL FLUX TUBES TRANSVERSE OSCILLATIONS MAGNETOHYDRODYNAMIC WAVES STEADY FLOWS SOLAR-FLARE MHD WAVES SEISMOLOGY PLASMA magnetohydrodynamics (MHD) Sun: corona Sun: magnetic fields waves
Language英语
Funding Project[973 program] ; [National Natural Science Foundation of China] ; [Provincial Natural Science Foundation of Shandong]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/62196
Collection中国科学院国家天文台
Affiliation中国科学院国家天文台
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Yu Hui,Chen ShaoXia,Li Bo,et al. Period ratios for standing kink and sausage modes in magnetized structures with siphon flow on the Sun[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(6).
APA Yu Hui,Chen ShaoXia,Li Bo,&Xia LiDong.(2016).Period ratios for standing kink and sausage modes in magnetized structures with siphon flow on the Sun.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(6).
MLA Yu Hui,et al."Period ratios for standing kink and sausage modes in magnetized structures with siphon flow on the Sun".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.6(2016).
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