Spacetime Hall-MHD Turbulence at Sub-ion Scales: Structures or Waves?

被引：12
|
作者：
Papini, Emanuele [1 ,2 ]
Cicone, Antonio [3 ,4 ,5 ]
Franci, Luca [2 ,6 ]
Piersanti, Mirko [4 ]
Landi, Simone [1 ,2 ]
Hellinger, Petr [7 ]
Verdini, Andrea [1 ,2 ]
机构：
[1] Univ Firenze, Dipartimento Fis & Astron, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy
[2] INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy
[3] Univ Studi Aquila, Dipartimento Ingn & Sci Informaz & Matemat, Via Vetoio 1, I-67100 Laquila, Italy
[4] INAF Ist Astrofis & Planetol Spaziali, Via Fosso Cavaliere 100, I-00133 Rome, Italy
[5] Ist Nazl Geofis & Vulcanol, Via Vigna Murata 605, I-00143 Rome, Italy
[6] Queen Mary Univ London, Sch Phys & Astron, London E1 4NS, England
[7] Czech Acad Sci, Astron Inst, Bocni 2 1401, Prague 14100, Czech Republic
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2021年 / 917卷 / 01期
基金：
英国科学技术设施理事会;
关键词：
SOLAR; ALFVEN; FLUID;
D O I：
10.3847/2041-8213/ac11fd
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Spatiotemporal properties of two-dimensional (2D) Hall-magnetohydrodynamic (MHD) turbulence at intermediate plasma beta = 2 are studied by means of Fast Iterative Filtering (FIF), a new technique for the decomposition of nonstationary nonlinear signals. Results show that the magnetic energy at sub-ion scales is concentrated in perturbations with frequencies smaller than the ion-cyclotron (IC) frequency and with polarization properties that are incompatible with both kinetic Alfven waves (KAWs) and IC waves. At higher frequencies, we clearly identify signatures of both whistler waves and KAWs; however, their energetic contribution to the magnetic power spectrum is negligible. We conclude that the dynamics of 2D Hall-MHD turbulence at sub-ion scales is mainly driven by localized intermittent structures, with no significant contribution of wavelike fluctuations.
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页数：7
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