Kinetic Range Spectral Features of Cross Helicity Using the Magnetospheric Multiscale Spacecraft

被引：19

作者：

Parashar, Tulasi N. ^{[1
]}

Chasapis, Alexandros ^{[1
]}

Bandyopadhyay, Riddhi ^{[1
]}

Chhiber, Rohit ^{[1
]}

Matthaeus, W. H. ^{[1
]}

Maruca, B. ^{[1
]}

Shay, M. A. ^{[1
]}

Burch, J. L. ^{[2
]}

Moore, T. E. ^{[3
]}

Giles, B. L. ^{[3
]}

Gershman, D. J. ^{[3
]}

Pollock, C. J. ^{[4
]}

Torbert, R. B. ^{[5
]}

Russell, C. T. ^{[6
]}

Strangeway, R. J. ^{[6
]}

Roytershteyn, Vadim ^{[7
]}

机构：

[1] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

[2] Southwest Res Inst, San Antonio, TX 78238 USA

[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[4] Denali Sci, Fairbanks, AK 99709 USA

[5] Univ New Hampshire, Durham, NH 03824 USA

[6] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[7] Space Sci Inst, Boulder, CO 80301 USA

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 121卷 / 26期

关键词：

MHD TURBULENCE SPECTRA; SOLAR-WIND; MAGNETOHYDRODYNAMIC TURBULENCE; RELAXATION PROCESSES; DEPENDENCE; DYNAMO; WAVES;

D O I：

10.1103/PhysRevLett.121.265101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study spectral features of ion velocity and magnetic field correlations in the magnetosheath and in the solar wind using data from the Magnetospheric Multiscale (MMS) spacecraft. High-resolution MMS observations enable the study of the transition of these correlations between their magnetofluid character at larger scales into the subproton kinetic range, previously unstudied in spacecraft data. Cross-helicity, angular alignment, and energy partitioning is examined over a suitable range of scales, employing measurements based on the Taylor frozen-in approximation as well as direct two-spacecraft correlation measurements. The results demonstrate signatures of alignment at large scales. As kinetic scales are approached, the alignment between v and b is destroyed by demagnetization of protons.

引用

页数：6

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