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

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.

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 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

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

Frequency-dependent absorbance of broadband terahertz wave in dense plasma sheet

2018 ◽  
Vol 124 (5) ◽  
Author(s):  
Yan Peng ◽  
Binbin Qi ◽  
Xiankai Jiang ◽  
Zhi Zhu ◽  
Hongwei Zhao ◽  
...  
Keyword(s):  
Plasma Sheet ◽  
Dense Plasma ◽  
Terahertz Wave ◽  
Frequency Dependent ◽  
Broadband Terahertz

scholarly journals Superposed epoch analysis of dense plasma access to geosynchronous orbit

2005 ◽  
Vol 23 (7) ◽  
pp. 2519-2529 ◽  
Author(s):  
B. Lavraud ◽  
M. H. Denton ◽  
M. F. Thomsen ◽  
J. E. Borovsky ◽  
R. H. W. Friedel
Keyword(s):  
Plasma Sheet ◽  
Ring Current ◽  
Dense Plasma ◽  
Transport Processes ◽  
Geosynchronous Orbit ◽  
Plasma Convection ◽  
Tail Region ◽  
Superposed Epoch Analysis ◽  
Magnetospheric Convection ◽  
Epoch Analysis

Abstract. We report on the occurrence of dense plasma access to geosynchronous orbit. We performed a superposed epoch analysis of 1464 events of dense (>2 cm–3 at onset) plasma observed by the MPA instruments on board the Los Alamos satellites, for the period 1990–2002. The results allow us to study the temporal evolution of various plasma parameters as a function of local time. We show that dense plasma access to geosynchronous orbit mostly occurs near local midnight. This dense plasma population is shown to be freshly injected from the mid-tail region, colder than the typical plasma sheet and composed of a relatively small O+ component. This population is thus probably the result of a cold, dense plasma sheet (CDPS) injection from the mid-tail region. Cold and dense ion populations are also observed on the dawnside of geosynchronous orbit at a similar epoch time. However, we demonstrate that this latter population is not the result of the dawnward transport of the population detected near midnight. The properties of this ion population may arise from the contribution of both ionospheric upflows and precipitating plasma sheet material. The correlation of an enhanced Kp index with the arrival of the CDPS at geosynchronous orbit shows that the inward transport of this population is allowed by an enhanced magnetospheric convection. Surprisingly, this dense plasma does not, in general, lead to a stronger Dst (ring current strength) within the 12 h following the CDPS injection. It is noted, however, that the superposed Kp index returns to relatively low values soon after the arrival of the CDPS. This may suggest that the dense plasma is, given the average of the 1464 events of this study, only transiting through geosynchronous orbit without accessing the inner regions and, therefore, does not contribute to the ring current. Keywords. Magnetospheric physics (Plasma convection; Plasma sheet) – Space plasma physics (Transport processes)

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