scholarly journals Wave Normal Angle Distribution of Magnetosonic Waves in the Earth's Magnetosphere: 2‐D PIC Simulation

2020 ◽  
Vol 125 (5) ◽  
Author(s):  
Jicheng Sun ◽  
Lunjin Chen ◽  
Xueyi Wang
Keyword(s):  
Angle Distribution ◽  
Pic Simulation ◽  
Earth’S Magnetosphere ◽  
Earth's Magnetosphere ◽  
Wave Normal ◽  
Normal Angle

scholarly journals Sensitivity of EMIC Wave‐Driven Scattering Loss of Ring Current Protons to Wave Normal Angle Distribution

2019 ◽  
Vol 46 (2) ◽  
pp. 590-598 ◽  
Author(s):  
Xing Cao ◽  
Binbin Ni ◽  
Danny Summers ◽  
Yuri Y. Shprits ◽  
Xudong Gu ◽  
...  
Keyword(s):  
Ring Current ◽  
Angle Distribution ◽  
Scattering Loss ◽  
Emic Wave ◽  
Wave Normal ◽  
Normal Angle

scholarly journals Generation of Multiband Chorus in the Earth's Magnetosphere: 1‐D PIC Simulation

2017 ◽  
Vol 44 (2) ◽  
pp. 618-624 ◽  
Author(s):  
Xinliang Gao ◽  
Yangguang Ke ◽  
Quanming Lu ◽  
Lunjin Chen ◽  
Shui Wang
Keyword(s):  
Pic Simulation ◽  
Earth’S Magnetosphere ◽  
Earth's Magnetosphere

Wave Normal Angle Distribution of Fast Magnetosonic Waves: A Survey of Van Allen Probes EMFISIS Observations

2019 ◽  
Vol 124 (7) ◽  
pp. 5663-5674 ◽  
Author(s):  
Zhengyang Zou ◽  
Pingbing Zuo ◽  
Binbin Ni ◽  
Fengsi Wei ◽  
Zhengyu Zhao ◽  
...  
Keyword(s):  
Angle Distribution ◽  
Van Allen Probes ◽  
Wave Normal ◽  
Normal Angle

scholarly journals Modeling of Anisotropy Dynamics of the Proton Pitch Angle Distribution in the Earth’s Magnetosphere

2021 ◽  
Vol 14 (5) ◽  
pp. 632-637
Author(s):  
Sergei V. Smolin ◽  
Keyword(s):  
Magnetic Storm ◽  
Geomagnetic Activity ◽  
Pitch Angle ◽  
Angle Distribution ◽  
Two Dimensional ◽  
Pitch Angle Distribution ◽  
Earth’S Magnetosphere ◽  
Anisotropy Index ◽  
Earth's Magnetosphere ◽  
In The Beginning

Last years the attention to research of anisotropy of the charged particle pitch angle distribution has considerably increased. Therefore for research of anisotropy dynamics of the proton pitch angle distribution is used the two-dimensional Phenomenological Model of the Ring Current (PheMRC 2-D), which includes the radial and pitch angle diffusions with consideration of losses due to wave-particle interactions. Experimental data are collected on the Polar/MICS satellite during the magnetic storm on October 21–22, 1999. Solving the non-stationary two-dimensional equation of pitch angle and radial diffusions, numerically was determined the proton pitch angle distribution anisotropy index (or parameter of the proton pitch angle distribution) for the pitch angle of 90 degrees during the magnetic storm, when the geomagnetic activity Kp-index changed from 2 in the beginning of a storm up to 7+ in the end of a storm. Dependence of the perpendicular proton pitch angle distribution anisotropy index with energy E = 90 keV during the different moments of time from the McIlwain parameter L (2.26 < L < 6.6) is received. It is certain at a quantitative level for the magnetic storm on October 21–22, 1999, when and where on the nightside of the Earth’s magnetosphere (MLT = 2300) to increase in the geomagnetic activity Kp-index there is a transition from normal (pancake) proton pitch angle distributions to butterfly proton pitch angle distributions. That has allowed to determine unequivocally and precisely the anisotropy dynamics of the proton pitch angle distribution in the given concrete case. It is shown, that with increase of the geomagnetic activity Kp-index the boundary of isotropic proton pitch angle distribution comes nearer to the Earth, reaching L ≈ 3.6 at Kp = 7+

scholarly journals Propagation and Dispersion of Lightning-Generated Whistlers Measured From the Van Allen Probes

2021 ◽  
Vol 9 ◽  
Author(s):  
J.-F. Ripoll ◽  
T. Farges ◽  
D. M. Malaspina ◽  
G. S. Cunningham ◽  
G. B. Hospodarsky ◽  
...  
Keyword(s):  
Refractive Index ◽  
Standard Deviation ◽  
Wave Power ◽  
Angle Distribution ◽  
Large Wave ◽  
Small Wave ◽  
Van Allen Probes ◽  
Wave Normal ◽  
Normal Angle ◽  
Field Wave

We study the propagation and attenuation of lightning-generated whistler (LGW) waves in near-Earth space (L ≤ 3) through the statistical study of three specific quantities extracted from data recorded by NASA’s Van Allen Probes mission, from 2012 to 2019: the LGW electric and magnetic power attenuation with respect to distance from a given lightning stroke, the LGW wave normal angle in space, and the frequency-integrated LGW refractive index. We find that LGW electric field wave power decays with distance mostly quadratically in space, with a power varying between -1 and -2, while the magnetic field wave power decays mostly linearly in space, with a power varying between 0 and -1. At night only, the electric wave power decays as a quadratic law and the magnetic power as a linear law, which is consistent with electric and magnetic ground measurements. Complexity of the dependence of the various quantities is maximal at the lowest L-shells (L &lt; 1.5) and around noon, for which LGW are the rarest in Van Allen Probes measurements. In-space near-equatorial LGW wave normal angle statistics are shown for the first time with respect to magnetic local time (MLT), L-shell (L), geographic longitude, and season. A distribution of predominantly electrostatic waves is peaked at large wave normal angle. Conversely, the distribution of electromagnetic waves with large magnetic component and small electric component is peaked at small wave normal angle. Outside these limits, we show that, as the LGW electric power increases, the LGW wave normal angle increases. But, as the LGW magnetic power increases, the LGW wave normal angle distribution becomes peaked at small wave normal angle with a secondary peak at large wave normal angle. The LGW mean wave-normal angle computed over the whole data set is 41.6° with a ∼24° standard deviation. There is a strong MLT-dependence, with the wave normal angle smaller for daytime (34.4° on average at day and 46.7° at night). There is an absence of strong seasonal and continental dependences of the wave-normal angle. The statistics of the LGW refractive index show a mean LGW refractive index is 32 with a standard deviation of ∼26. There is a strong MLT-dependence, with larger refractive index for daytime 36) than for nighttime (28). Smaller refractive index is found during Northern hemisphere summer for L-shells above 1.8, which is inconsistent with Chapman ionization theory and consistent with the so-called winter/seasonal anomaly. Local minima of the mean refractive index are observed over the three continents. Cross-correlation of these wave parameters in fixed (MLT, L) bins shows that the wave normal angle and refractive index are anti-correlated; large (small) wave normal angles correspond with small (large) refractive indexes. High power attenuation during LGW propagation from the lightning source to the spacecraft is correlated with large refractive index and anti-correlated with small wave normal angle. Correlation and anti-correlation show a smooth and continuous path from one regime (i.e. large wave normal angle, small refractive index, low attenuation) to its opposite (i.e. small wave normal angle, large refractive index, large attenuation), supporting consistency of the results.

scholarly journals Diffuse auroral scattering by whistler mode chorus waves: Dependence on wave normal angle distribution

2011 ◽  
Vol 116 (A10) ◽  
pp. n/a-n/a ◽  
Author(s):  
Binbin Ni ◽  
Richard M. Thorne ◽  
Nigel P. Meredith ◽  
Yuri Y. Shprits ◽  
Richard B. Horne
Keyword(s):  
Angle Distribution ◽  
Whistler Mode ◽  
Chorus Waves ◽  
Wave Normal ◽  
Normal Angle
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