Flow Channels and the Generation of Alfvenic Turbulence Along Storm-Time Inner Magnetospheric Field-Lines

被引：3

作者：

Chaston, Christopher C. ^{[1
]}

机构：

[1] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2022年 / 49卷 / 23期

基金：

美国国家科学基金会;

关键词：

Alfven waves; geomagnetic storms; turbulence; flow channels; Kelvin-Helmholtz instability; inner magnetosphere; WAVES; MAGNETOTAIL; PROPAGATION; RESONANCES; ELECTRONS; EVOLUTION; BOUNDARY;

D O I：

10.1029/2022GL101321

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

A feature of Earth's storm-time magnetosphere outside the plasmapause is the occurrence of broad-spectrum Alfvenic fluctuations. In this letter observations from the Van Allen Probes are compared with 3-D fluid-kinetic simulations of an evolving convective flow channel to investigate the mechanisms generating the observed spectrum. It is shown how narrow channels of fast convection are unstable to the Kelvin-Helmholtz instability which on closed field-lines initiates a cascade to small scales. Sustained driving of the flow combined with reflection from the topside ionosphere leads to the generation of an intensified spectrum of electromagnetic structures having similar spectral and morphological characteristics to those observed. This process couples enhanced magnetospheric convection to kinetic scale electromagnetic fluctuations that drive particle transport, scattering and energization through the outer radiation belt and ring current during geomagnetic storms.

引用

页数：12

共 55 条

[1] Magnetotail waveguide: Fast and Alfven waves in the plasma sheet boundary layer and lobe [J].

Allan, W ;

Wright, AN .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2000, 105 (A1) :317-328

[2] The Space Physics Environment Data Analysis System (SPEDAS) [J].

Angelopoulos, V. ;

Cruce, P. ;

Drozdov, A. ;

Grimes, E. W. ;

Hatzigeorgiu, N. ;

King, D. A. ;

Larson, D. ;

Lewis, J. W. ;

McTiernan, J. M. ;

Roberts, D. A. ;

Russell, C. L. ;

Hori, T. ;

Kasahara, Y. ;

Kumamoto, A. ;

Matsuoka, A. ;

Miyashita, Y. ;

Miyoshi, Y. ;

Shinohara, I. ;

Teramoto, M. ;

Faden, J. B. ;

Halford, A. J. ;

McCarthy, M. ;

Millan, R. M. ;

Sample, J. G. ;

Smith, D. M. ;

Woodger, L. A. ;

Masson, A. ;

Narock, A. A. ;

Asamura, K. ;

Chang, T. F. ;

Chiang, C. -Y. ;

Kazama, Y. ;

Keika, K. ;

Matsuda, S. ;

Segawa, T. ;

Seki, K. ;

Shoji, M. ;

Tam, S. W. Y. ;

Umemura, N. ;

Wang, B. -J. ;

Wang, S. -Y. ;

Redmon, R. ;

Rodriguez, J. V. ;

Singer, H. J. ;

Vandegriff, J. ;

Abe, S. ;

Nose, M. ;

Shinbori, A. ;

Tanaka, Y. -M. ;

UeNo, S. .

SPACE SCIENCE REVIEWS, 2019, 215 (01)

[3] STATISTICAL CHARACTERISTICS OF BURSTY BULK FLOW EVENTS [J].

ANGELOPOULOS, V ;

KENNEL, CF ;

CORONITI, FV ;

PELLAT, R ;

KIVELSON, MG ;

WALKER, RJ ;

RUSSELL, CT ;

BAUMJOHANN, W ;

FELDMAN, WC ;

GOSLING, JT .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1994, 99 (A11) :21257-21280

[4] Electron trapping and acceleration by kinetic Alfven waves in the inner magnetosphere [J].

Artemyev, A. V. ;

Rankin, R. ;

Blanco, M. .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2015, 120 (12) :10305-10316

[5] The Magnetic Electron Ion Spectrometer (MagEIS) Instruments Aboard the Radiation Belt Storm Probes (RBSP) Spacecraft [J].

Blake, J. B. ;

Carranza, P. A. ;

Claudepierre, S. G. ;

Clemmons, J. H. ;

Crain, W. R., Jr. ;

Dotan, Y. ;

Fennell, J. F. ;

Fuentes, F. H. ;

Galvan, R. M. ;

George, J. S. ;

Henderson, M. G. ;

Lalic, M. ;

Lin, A. Y. ;

Looper, M. D. ;

Mabry, D. J. ;

Mazur, J. E. ;

McCarthy, B. ;

Nguyen, C. Q. ;

O'Brien, T. P. ;

Perez, M. A. ;

Redding, M. T. ;

Roeder, J. L. ;

Salvaggio, D. J. ;

Sorensen, G. A. ;

Spence, H. E. ;

Yi, S. ;

Zakrzewski, M. P. .

SPACE SCIENCE REVIEWS, 2013, 179 (1-4) :383-421

[6]

Chandrasekar, 1961, HYDRODYNAMIC HYDROMA

[7]

Chaston CC, 2006, GEOPHYS MONOGR SER, V169, P239

[8] Filamentary Currents and Alfvenic Vortices in the Inner Magnetosphere [J].

Chaston, C. C. ;

Bonnell, J. W. ;

Wygant, J. R. ;

Reeves, G. D. ;

Baker, D. N. .

GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (04)

[9] Pitch Angle Scattering and Loss of Radiation Belt Electrons in Broadband Electromagnetic Waves [J].

Chaston, C. C. ;

Bonnell, J. W. ;

Halford, A. J. ;

Reeves, G. D. ;

Baker, D. N. ;

Kletzing, C. A. ;

Wygant, J. R. .

GEOPHYSICAL RESEARCH LETTERS, 2018, 45 (18) :9344-9352

[10] Radiation Belt "Dropouts" and Drift-Bounce Resonances in Broadband Electromagnetic Waves [J].

Chaston, C. C. ;

Bonnell, J. W. ;

Wygant, J. R. ;

Reeves, G. D. ;

Baker, D. N. ;

Melrose, D. B. .

GEOPHYSICAL RESEARCH LETTERS, 2018, 45 (05) :2128-2137

← 1 2 3 4 5 6 →