POTENTIAL EVIDENCE FOR THE ONSET OF ALFVENIC TURBULENCE IN TRANS-EQUATORIAL CORONAL LOOPS

被引：23

作者：

De Moortel, I. ^{[1
]}

McIntosh, S. W. ^{[2
]}

Threlfall, J. ^{[1
]}

Bethge, C. ^{[3
]}

Liu, J. ^{[4
]}

机构：

[1] Univ St Andrews, Sch Math & Stat, St Andrews KY16 9SS, Fife, Scotland

[2] Natl Ctr Atmospher Res, High Altitude Observ, Boulder, CO 80307 USA

[3] Kiepenheuer Inst Solar Phys, D-79104 Freiburg, Germany

[4] Univ Sci & Technol China, Earth & Space Sci Sch, Hefei 230026, Peoples R China

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2014年 / 782卷 / 02期

基金：

美国国家科学基金会;

关键词：

magnetohydrodynamics (MHD); Sun: atmosphere; Sun: corona; Sun: oscillations; turbulence; waves; FAST SOLAR-WIND; MAGNETOHYDRODYNAMIC WAVES; KINK WAVES; ENERGY CONTENT; OSCILLATIONS; CHROMOSPHERE; PROMINENCE; SEISMOLOGY; HOLES; ACCELERATION;

D O I：

10.1088/2041-8205/782/2/L34

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

This study investigates Coronal Multi-channel Polarimeter Doppler-shift observations of a large, off-limb, trans-equatorial loop system observed on 2012 April 10-11. Doppler-shift oscillations with a broad range of frequencies are found to propagate along the loop with a speed of about 500 km s(-1). The power spectrum of perturbations travelling up from both loop footpoints is remarkably symmetric, probably due to the almost perfect north-south alignment of the loop system. Compared to the power spectrum at the footpoints of the loop, the Fourier power at the apex appears to be higher in the high-frequency part of the spectrum than expected from theoretical models. We suggest this excess high-frequency power could be tentative evidence for the onset of a cascade of the low-to-mid frequency waves into (Alfvenic) turbulence.

引用

页数：6

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