scholarly journals Observations of Particle Loss due to Injection‐Associated EMIC Waves

2021 ◽  
Author(s):  
Hyomin Kim ◽  
Quintin Schiller ◽  
Mark J. Engebretson ◽  
Sungjun Noh ◽  
Ilya Kuzichev ◽  
...  
Keyword(s):  
Particle Loss ◽  
Emic Waves

Analysis of neutral active particle loss in afterglow in krypton at 2.6mbar pressure

2008 ◽  
Vol 15 (1) ◽  
pp. 013502 ◽  
Author(s):  
Momcilo M. Pejovic ◽  
Jugoslav P. Karamarkovic ◽  
Goran S. Ristic ◽  
Milic M. Pejovic
Keyword(s):  
Active Particle ◽  
Particle Loss

scholarly journals A subauroral polarization stream driven by field‐aligned currents associated with precipitating energetic ions caused by EMIC waves: A case study

2016 ◽  
Vol 121 (2) ◽  
pp. 1696-1705 ◽  
Author(s):  
Zhigang Yuan ◽  
Ying Xiong ◽  
Zheng Qiao ◽  
Haimeng Li ◽  
Shiyong Huang ◽  
...  
Keyword(s):  
Energetic Ions ◽  
Emic Waves

Direct measurements of cold and hot plasma composition and EMIC waves in the outer magnetosphere: Implications for inner magnetosphere wave-particle interactions

2021 ◽  
Author(s):  
Justin Lee ◽  
Drew Turner ◽  
Sarah Vines ◽  
Robert Allen ◽  
Sergio Toledo-Redondo
Keyword(s):  
Unstable Wave ◽  
Linear Wave ◽  
Plasma Composition ◽  
Inner Magnetosphere ◽  
Hot Plasma ◽  
Emic Wave ◽  
Direct Measurements ◽  
Wave Numbers ◽  
Emic Waves

<p>Although thorough characterization of magnetospheric ion composition is rare for EMIC wave studies, convective processes that occur more frequently in Earth’s outer magnetosphere have allowed the Magnetospheric Multiscale (MMS) satellites to make direct measurements of the cold and hot plasma composition during EMIC wave activity. We will present an observation and linear wave modeling case study conducted on EMIC waves observed during a perturbed activity period in the outer dusk-side magnetosphere. During the two intervals investigated for the case study, the MMS satellites made direct measurements of cold plasmaspheric plasma in addition to multiple hot ion components at the same time as EMIC wave emissions were observed. Applying the in-situ plasma composition data to wave modeling, we find that wave growth rate is impacted by the complex interactions between the cold as well as the hot ion components and ambient plasma conditions. In addition, we observe that linear wave properties (unstable wave numbers and band structure) can significantly evolve with changes in cold and hot ion composition. Although the modeling showed the presence of dense cold ions can broaden the range of unstable wave numbers, consistent with previous work, the hot heavy ions that were more abundant nearer storm main phase could limit the growth of EMIC waves to smaller wave numbers. In the inner magnetosphere, where higher cold ion density is expected, the ring current heavy ions could also be more intense near storm-time, possibly resulting in conditions that limit the interactions of EMIC waves with trapped radiation belt electrons to multi-MeV energies. Additional investigation when direct measurements of cold and hot plasma composition are available could improve understanding of EMIC waves and their interactions with trapped energetic particles in the inner magnetosphere.</p>

Controlled precipitation of energetic Van Allen belt protons by electromagnetic ion cyclotron (EMIC) waves

Space Weather ◽  
2014 ◽  
Vol 12 (6) ◽  
pp. 354-367 ◽  
Author(s):  
M. de Soria-Santacruz ◽  
M. Martinez-Sanchez ◽  
Y. Y. Shprits
Keyword(s):  
Ion Cyclotron ◽  
Controlled Precipitation ◽  
Emic Waves

scholarly journals Simultaneous Observations of Electromagnetic Ion Cyclotron (EMIC) Waves and Pitch Angle Scattering During a Van Allen Probes Conjunction

2020 ◽  
Vol 125 (4) ◽  
Author(s):  
K. Sigsbee ◽  
C. A. Kletzing ◽  
J. B. Faden ◽  
A. N. Jaynes ◽  
G. D. Reeves ◽  
...  
Keyword(s):  
Pitch Angle ◽  
Angle Scattering ◽  
Van Allen Probes ◽  
Ion Cyclotron ◽  
Emic Waves

scholarly journals Trapping and amplification of unguided mode EMIC waves in the radiation belt

2021 ◽  
Author(s):  
Geng Wang ◽  
Zhonglei Gao ◽  
Mingyu Wu ◽  
Guoqiang Wang ◽  
Sudong Xiao ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Abundance Ratio ◽  
Relativistic Electrons ◽  
Scattering Loss ◽  
Propagation Behavior ◽  
Guided Mode ◽  
Waves Propagation ◽  
Spatial Locations ◽  
First Time ◽  
Emic Waves

Abstract Electromagnetic ion cyclotron (EMIC) waves can cause the scattering loss of the relativistic electrons in the earth's radiation belt. They can be classified into the guided mode and the unguided mode, according to waves propagation behavior. The guided mode waves have been widely investigated in the radiation belt, but the observation of the unguided mode waves have not been expected. Based on the observations of Van Allen Probes, we demonstrate for the first time the existence of the intense unguided mode EMIC waves. The reflection interface formed by the spatial locations of local helium cutoff frequencies can be nearly parallel to the equatorial plane when the proton abundance ratio decreases sharply with L-shell. This structure combined with the anisotropic hot protons can lead to the trapping and significant amplification of the unguided mode waves. These results may help to understand the nature of EMIC waves in the radiation belt.

scholarly journals A Case Study of Transversely Heated Low‐Energy Helium Ions by EMIC Waves in the Plasmasphere

2021 ◽  
Vol 126 (2) ◽  
Author(s):  
Khan‐Hyuk Kim ◽  
Hyuck‐Jin Kwon ◽  
Junhyun Lee ◽  
Ho Jin ◽  
Jungjoon Seough
Keyword(s):  
Low Energy ◽  
Helium Ions ◽  
Emic Waves
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