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 Cold and Dense Plasma Sheet Caused by Solar Wind Entry: Direct Evidence

Atmosphere ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 831
Author(s):  
Yue Yu ◽  
Zuzheng Chen ◽  
Fang Chen
Keyword(s):  
Solar Wind ◽  
Plasma Sheet ◽  
Cross Correlation ◽  
Direct Evidence ◽  
Dense Plasma ◽  
Ion Density ◽  
Average Value ◽  
Magnetospheric Multiscale ◽  
Cross Correlation Analysis ◽  
Solar Wind Entry

We present a coordinated observation with the Magnetospheric Multiscale (MMS) mission, located in the Earth’s magnetotail plasma sheet, and the Acceleration, Reconnection, Turbulence, and Electrodynamics of the Moon’s Interaction with the Sun (ARTEMIS) mission, located in the solar wind, in order to understand the formation mechanism of the cold and dense plasma sheet (CDPS). MMS detected two CDPSs composed of two ion populations with different energies, where the energy of the cold ion population is the same as that of the solar wind measured by ARTEMIS. This feature directly indicates that the CDPSs are caused by the solar wind entry. In addition, He+ was observed in the CDPSs. The plasma density in these two CDPSs are ~1.8 cm−3 and ~10 cm−3, respectively, roughly 4–30 times the average value of a plasma sheet. We performed a cross-correlation analysis on the ion density of the CDPS and the solar wind, and we found that it takes 3.7–5.9 h for the solar wind to enter the plasma sheet. Such a coordinated observation confirms the previous speculation based on single-spacecraft measurements.

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.

Cold-dense plasma sheet and hot-dense ions in the inner-magnetosphere

2002 ◽  
Vol 30 (10) ◽  
pp. 2279-2288 ◽  
Author(s):  
M. Fujimoto ◽  
T. Mukai ◽  
S. Kokubun
Keyword(s):  
Plasma Sheet ◽  
Dense Plasma ◽  
Inner Magnetosphere

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.

Ultra-relativistic electron’s pitch angle distribution narrowing associated with the solar wind density enhancement

2020 ◽  
Author(s):  
Lun Xie ◽  
Ying Xiong ◽  
Suiyan Fu ◽  
Zuyin Pu
Keyword(s):  
Solar Wind ◽  
Plasma Sheet ◽  
Pitch Angle ◽  
Dense Plasma ◽  
Particle Interaction ◽  
Angle Distribution ◽  
Pitch Angle Distribution ◽  
Solar Wind Density ◽  
Wave Particle Interaction ◽  
Emic Waves

<p>Electron pitch angle distribution (PAD) is a critical parameter in the study of the dynamics of the radiation belt electrons. It is well known that solar wind pressure has an impact on the PAD of the geomagnetically trapped electrons. Using the Van Allen Probes' data, we find that the MeV electron PAD at 4.5<L*<5.5 became narrowing (PAD is mainly concentrated at 90 degree) for over three days during a prolonged enhancement of the solar wind number density on November 27-30, 2015. During that period, the EMIC waves are observed by Van Allen Probe-A and ground stations on the afternoon and dusk MLTs at L>4. Meanwile, the precipitations of tens of keV protons and MeV electrons are observed by POES satellites. Additionally, there is a growing dip in electron phase space density at L*~5, indicating a local loss caused by the wave-particle interaction. The narrowing of the electron PAD is energy-dependent and the PAD is more anisotropic for electrons with higher energy, which is consistent with the wave-particle interaction with the EMIC waves. Furthermore, previous studies have shown that high solar wind density can lead to a hot and dense plasma sheet. The inward penetration of a dense plasma-sheet down to 4 Re has been confirmed by THEMIS spacecraft. We suggest that the overlap of the plasma sheet and the plasmasphere provide a favorable condition for exciting EMIC waves and the loss of small pitch angle electrons by EMIC waves can lead to the electron PAD narrowing. </p><div> </div>

scholarly journals Spatial Distribution and Semiannual Variation of Cold‐Dense Plasma Sheet

2018 ◽  
Vol 123 (1) ◽  
pp. 464-472 ◽  
Author(s):  
Shichen Bai ◽  
Quanqi Shi ◽  
Anmin Tian ◽  
Motoharu Nowada ◽  
Alexander W. Degeling ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Plasma Sheet ◽  
Dense Plasma ◽  
Semiannual Variation

scholarly journals Imaging the development of the cold dense plasma sheet

2015 ◽  
Vol 42 (19) ◽  
pp. 7867-7873 ◽  
Author(s):  
S. A. Fuselier ◽  
M. A. Dayeh ◽  
G. Livadiotis ◽  
D. J. McComas ◽  
K. Ogasawara ◽  
...  
Keyword(s):  
Plasma Sheet ◽  
Dense Plasma
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