scholarly journals In situ statistical observations of Pc1 pearl pulsations and unstructured EMIC waves by the Van Allen Probes

2017 ◽  
Vol 122 (1) ◽  
pp. 105-119 ◽  
Author(s):  
K. W. Paulson ◽  
C. W. Smith ◽  
M. R. Lessard ◽  
R. B. Torbert ◽  
C. A. Kletzing ◽  
...  
Keyword(s):  
Van Allen Probes ◽  
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 Effect of EMIC waves on relativistic and ultrarelativistic electron populations: Ground-based and Van Allen Probes observations

2014 ◽  
Vol 41 (5) ◽  
pp. 1375-1381 ◽  
Author(s):  
M. E. Usanova ◽  
A. Drozdov ◽  
K. Orlova ◽  
I. R. Mann ◽  
Y. Shprits ◽  
...  
Keyword(s):  
Ultrarelativistic Electron ◽  
Van Allen Probes ◽  
Emic Waves

Spatial localization and ducting of EMIC waves: Van Allen Probes and ground-based observations

2014 ◽  
Vol 41 (3) ◽  
pp. 785-792 ◽  
Author(s):  
I. R. Mann ◽  
M. E. Usanova ◽  
K. Murphy ◽  
M. T. Robertson ◽  
D. K. Milling ◽  
...  
Keyword(s):  
Spatial Localization ◽  
Van Allen Probes ◽  
Emic Waves

scholarly journals Energetic ions scattered into the loss cone with observations of the Cluster satellite

2016 ◽  
Vol 34 (2) ◽  
pp. 249-257 ◽  
Author(s):  
Ying Xiong ◽  
Zhigang Yuan ◽  
Jingfang Wang
Keyword(s):  
Field Line ◽  
Plasma Sheet ◽  
Outer Boundary ◽  
Scattering Mechanism ◽  
Loss Cone ◽  
Energetic Ions ◽  
Left Hand ◽  
Central Plasma ◽  
Emic Waves

Abstract. In this paper, we report in situ observations by the Cluster spacecraft of energetic ions scattered into the loss cone during the inbound pass from the plasma sheet into the plasmasphere. During the inbound pass of the plasma sheet, Cluster observed the isotropy ratio of energetic ions to gradually decrease from unity and the isotropic boundary extended to lower L value for higher-energy ions, implying that the field line curvature scattering mechanism is responsible for the scattered ions into the loss cone from the plasma sheet. In the outer boundary of a plasmasphere plume, Cluster 3 observed the increase of the isotropy ratio of energetic ions accompanied by enhancements of Pc2 waves with frequencies between the He+ ion gyrofrequency and O+ ion gyrofrequency estimated in the equatorial plane. Those Pc2 waves were left-hand circularly polarized and identified as electromagnetic ion cyclotron (EMIC) waves. Using the observed parameters, the calculations of the pitch angle diffusion coefficients for ring current protons demonstrate that EMIC waves could be responsible for the ions scattering and loss-cone filling. Our observations provide in situ evidence of energetic ion loss in the plasma sheet and the plasmasphere plume. Our results suggest that energetic ions scattering into the loss cone in the central plasma sheet and the outer boundary of the plasmaspheric plume are attributed to the field line curvature scattering mechanism and EMIC wave scattering mechanism, respectively.

scholarly journals EMIC Waves Converted From Equatorial Noise Due to M / Q = 2 Ions in the Plasmasphere: Observations From Van Allen Probes and Arase

2019 ◽  
Vol 46 (11) ◽  
pp. 5662-5669 ◽  
Author(s):  
Y. Miyoshi ◽  
S. Matsuda ◽  
S. Kurita ◽  
K. Nomura ◽  
K. Keika ◽  
...  
Keyword(s):  
Van Allen Probes ◽  
Emic Waves

EMIC waves covering wide L shells: MMS and Van Allen Probes observations

2017 ◽  
Vol 122 (7) ◽  
pp. 7387-7395 ◽  
Author(s):  
Xiongdong Yu ◽  
Zhigang Yuan ◽  
Shiyong Huang ◽  
Dedong Wang ◽  
Haimeng Li ◽  
...  
Keyword(s):  
Van Allen Probes ◽  
Emic Waves

scholarly journals Excitation of EMIC waves detected by the Van Allen Probes on 28 April 2013

2014 ◽  
Author(s):  
J.-C. Zhang ◽  
A. A. Saikin ◽  
L. M. Kistler ◽  
C. W. Smith ◽  
H. E. Spence ◽  
...  
Keyword(s):  
Van Allen Probes ◽  
Emic Waves

scholarly journals Storm Time EMIC Waves Observed by Swarm and Van Allen Probe Satellites

2021 ◽  
Author(s):  
Yangfan He ◽  
Hui Wang ◽  
Lühr Hermann ◽  
Kistler Lynn ◽  
Saikin Anthony ◽  
...  
Keyword(s):  
Dynamic Pressure ◽  
Recovery Phase ◽  
Early Recovery ◽  
Expansion Phase ◽  
Van Allen Probes ◽  
Substorm Activity ◽  
Temporal And Spatial ◽  
Maximum Occurrence ◽  
Winter Hemisphere ◽  
Emic Waves

<p>The temporal and spatial evolution of electromagnetic ion cyclotron (EMIC) waves during<br>the magnetic storm of 21–29 June 2015 was investigated using high-resolution magnetic field observations<br>from Swarm constellation in the ionosphere and Van Allen Probes in the magnetosphere. Magnetospheric<br>EMIC waves had a maximum occurrence frequency in the afternoon sector and shifted equatorward during<br>the expansion phase and poleward during the recovery phase. However, ionospheric waves in subauroral<br>regions occurred more frequently in the nighttime than during the day and exhibited less obvious<br>latitudinal movements. During the main phase, dayside EMIC waves occurred in both the ionosphere<br>and magnetosphere in response to the dramatic increase in the solar wind dynamic pressure. Waves were<br>absent in the magnetosphere and ionosphere around the minimum SYM-H. During the early recovery<br>phase, He<sup>+ </sup>band EMIC waves were observed in the ionosphere and magnetosphere. During the late<br>recovery phase, H<sup>+</sup> band EMIC waves emerged in response to enhanced earthward convection during<br>substorms in the premidnight sector. The occurrence of EMIC waves in the noon sector was affected by<br>the intensity of substorm activity. Both ionospheric wave frequency and power were higher in the summer<br>hemisphere than in the winter hemisphere. Waves were confined to an MLT interval of less than 5 hr with a<br>duration of less than 186 min from coordinated observations. The results could provide additional insights<br>into the spatial characteristics and propagation features of EMIC waves during storm periods</p>

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