Distant magnetotail reconnection and the coupling to the near-Earth plasma sheet: Wind and Geotail case study

2004 ◽  
Vol 31 (18) ◽  
Author(s):  
Marit Øieroset
Keyword(s):  
Plasma Sheet ◽  
Magnetotail Reconnection

Plasma sheet oscillations and their relation to substorm development: Cluster and double star TC1 case study

2008 ◽  
Vol 41 (10) ◽  
pp. 1585-1592 ◽  
Author(s):  
T. Takada ◽  
R. Nakamura ◽  
Y. Asano ◽  
W. Baumjohann ◽  
A. Runov ◽  
...  
Keyword(s):  
Plasma Sheet ◽  
Double Star

scholarly journals The current sheet flapping motions induced by non-adiabatic ions: case study

2018 ◽  
Author(s):  
Xinhua Wei ◽  
Chunlin Cai ◽  
Henri Rème ◽  
Iannis Dandouras ◽  
George Parks
Keyword(s):  
Magnetic Field ◽  
Current Sheet ◽  
Field Line ◽  
Magnetic Field Line ◽  
Plasma Sheet ◽  
Plasma Sources ◽  
Shear Structures ◽  
Particle Population ◽  
Alternating Bending

Abstract. In this paper, we analyzed the y-component of magnetic field line curvature in the plasma sheet and found that there are two kinds of shear structures of the flapping current sheet, i.e. symmetric and antisymmetric. The alternating bending orientations of guiding field are exactly corresponding to alternating north-south asymmetries of the bouncing ion population in the sheet center. Those alternating asymmetric plasma sources consequently induce the current sheet flapping motion as a driver. In addition, a substantial particle population with dawnward motion was observed in the center of a bifurcated current sheet. This population is identified as the quasi-adiabatic particles, and provides a net current opposite to the conventional cross-tail current.

scholarly journals Timescale for the formation of the cold-dense plasma sheet: A case study

2006 ◽  
Vol 33 (23) ◽  
Author(s):  
Simon Wing ◽  
Jay R. Johnson ◽  
Masaki Fujimoto
Keyword(s):  
Plasma Sheet ◽  
Dense Plasma

scholarly journals Observations of plasma vortices in the vicinity of flow-braking: a case study

2009 ◽  
Vol 27 (8) ◽  
pp. 3009-3017 ◽  
Author(s):  
K. Keika ◽  
R. Nakamura ◽  
M. Volwerk ◽  
V. Angelopoulos ◽  
W. Baumjohann ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Plasma Sheet ◽  
Convective Flow ◽  
Flow Patterns ◽  
Plasma Flows ◽  
Convective Flows ◽  
Field Fluctuations ◽  
Plasma Vortices

Abstract. We examine fast plasma flows and magnetic field fluctuations observed by THEMIS at 03:00–03:30 UT on 12 December 2007. All THEMIS probes are situated in the near-Earth plasma sheet (XSM>−10 RE) with 1–2 RE spacecraft separations in azimuthal and radial directions. We focus on the observations of plasma convective flows made simultaneously by more than one THEMIS probe. At about 03:10 UT and 03:14 UT, the THEMIS P2 probe observed earthward flows of >100 km/s. The THEMIS P1 probe, located duskward and earthward of P2, observed tailward flows under a positive Bz. The inner most probe THEMIS P4, located at almost the same MLT as THEMIS P1 and P2, did not see any clear flow. We examine the convective flow patterns for the THEMIS observations. We conclude that plasma vortices are formed near the region where the earthward flows slow down and turn in azimuthal directions.

scholarly journals A case study of HF radar spectral width in the post midnight magnetic local time sector and its relationship to the polar cap boundary

2002 ◽  
Vol 20 (4) ◽  
pp. 501-509 ◽  
Author(s):  
E. E. Woodfield ◽  
J. A. Davies ◽  
P. Eglitis ◽  
M. Lester
Keyword(s):  
Local Time ◽  
Plasma Sheet ◽  
Optical Emission ◽  
Spectral Width ◽  
Radar Data ◽  
Magnetic Local Time ◽  
Hf Radar ◽  
Polar Cap ◽  
Central Plasma

Abstract. The aim of this paper is to advance the current understanding of the spectral width parameter observed by coherent high frequency (HF) radars. In particular, we address the relationship of a frequently observed gradient, between low ( < 200 m/s) and high ( > 200 m/s) spectral width, to magnetospheric boundaries. Previous work has linked this gradient in the spectral width, in the nightside sector of magnetic local time, to the Polar Cap Boundary (PCB), and also to the boundary between the Central Plasma Sheet (CPS) and the Plasma Sheet Boundary Layer (PSBL). The present case study investigates the former by comparison with the 630.0 nm optical emission. No suitable data were available to test the second of the two hypotheses. It is found that during the interval in question the spectral width gradient is within the region of the 630.0 nm optical emission. A comparison of coherent and incoherent scatter radar data is also conducted, which indicates that values of high spectral width are typically collocated with elevated F-region electron temperatures. We conclude that the high spectral width region in the interval under study is associated with particle precipitation and also that the spectral width gradient is not a reliable method for locating the PCB.Key words. Ionosphere (auroral ionosphere; ionospheric irregularities)

scholarly journals Origin of temperature anisotropies in the cold plasma sheet: Geotail observations around the Kelvin-Helmholtz vortices

2007 ◽  
Vol 25 (9) ◽  
pp. 2069-2086 ◽  
Author(s):  
M. N. Nishino ◽  
M. Fujimoto ◽  
G. Ueno ◽  
T. Mukai ◽  
Y. Saito
Keyword(s):  
Plasma Sheet ◽  
Cold Plasma ◽  
Vortical Structure ◽  
Distribution Functions ◽  
Local Magnetic Field ◽  
Current Layer ◽  
Particle Interactions ◽  
Selective Heating ◽  
Solar Wind Entry

Abstract. To further our understanding of the solar wind entry across the magnetopause under northward IMF, we perform a case study of a duskside Kelvin-Helmholtz (KH) vortex event on 24 March 1995. We have found that the protons consist of two separate (cold and hot) components in the magnetosphere-like region inside the KH vortical structure. The cold proton component occasionally consisted of counter-streaming beams near the current layer in the KH vortical structure. Low-energy bidirectional electron beams or flat-topped electron distribution functions in the direction along the local magnetic field were apparent on the magnetosphere side of the current layer. We discuss that the bidirectionality of the electrons and the cold proton component implies magnetic reconnection inside the KH vortical structure. In addition, we suggest selective heating of electrons inside the vortical structure via wave-particle interactions. Comparing temperatures in the magnetosphere-like region inside the vortical structure with those in the cold plasma sheet, we show that further heating of both the electrons and the cold proton component is taking place in the cold plasma sheet or on the way from the vortices to the cold plasma sheet.

Case study of small scale polytropic index in the central plasma sheet

2015 ◽  
Vol 58 (11) ◽  
pp. 1993-2001 ◽  
Author(s):  
XueXia Pang ◽  
JinBin Cao ◽  
WenLong Liu ◽  
YuDuan Ma ◽  
HaoYu Lu ◽  
...  
Keyword(s):  
Plasma Sheet ◽  
Small Scale ◽  
Polytropic Index ◽  
Central Plasma ◽  
Central Plasma Sheet

scholarly journals Energy limits of electron acceleration in the plasma sheet during substorms: A case study with the Magnetospheric Multiscale (MMS) mission

2016 ◽  
Vol 43 (15) ◽  
pp. 7785-7794 ◽  
Author(s):  
D. L. Turner ◽  
J. F. Fennell ◽  
J. B. Blake ◽  
J. H. Clemmons ◽  
B. H. Mauk ◽  
...  
Keyword(s):  
Plasma Sheet ◽  
Electron Acceleration ◽  
Magnetospheric Multiscale
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