scholarly journals Control of ULF Wave Accessibility to the Inner Magnetosphere by the Convection of Plasma Density

2018 ◽  
Vol 123 (2) ◽  
pp. 1086-1099 ◽  
Author(s):  
A. W. Degeling ◽  
I. J. Rae ◽  
C. E. J. Watt ◽  
Q. Q. Shi ◽  
R. Rankin ◽  
...  
Keyword(s):  
Plasma Density ◽  
Inner Magnetosphere ◽  
Ulf Wave

Increase in relativistic electron flux in the inner magnetosphere: ULF wave mode structure

2000 ◽  
Vol 25 (12) ◽  
pp. 2327-2337 ◽  
Author(s):  
M.K. Hudson ◽  
S.R. Elkington ◽  
J.G. Lyon ◽  
C.C. Goodrich
Keyword(s):  
Relativistic Electron ◽  
Electron Flux ◽  
Wave Mode ◽  
Mode Structure ◽  
Inner Magnetosphere ◽  
Ulf Wave

Recent progress on ULF wave and its interactions with energetic particles in the inner magnetosphere

2008 ◽  
Vol 51 (10) ◽  
pp. 1620-1625 ◽  
Author(s):  
QiuGang Zong ◽  
YongFu Wang ◽  
Biao Yang ◽  
SuiYan Fu ◽  
ZuYin Pu ◽  
...  
Keyword(s):  
Recent Progress ◽  
Energetic Particles ◽  
Inner Magnetosphere ◽  
Ulf Wave

scholarly journals Solar wind influence on Pc4 and Pc5 ULF wave activity in the inner magnetosphere

2010 ◽  
Vol 115 (A12) ◽  
pp. n/a-n/a ◽  
Author(s):  
W. Liu ◽  
T. E. Sarris ◽  
X. Li ◽  
R. Ergun ◽  
V. Angelopoulos ◽  
...  
Keyword(s):  
Solar Wind ◽  
Wave Activity ◽  
Inner Magnetosphere ◽  
Ulf Wave ◽  
Wind Influence

Roles of magnetospheric convection on nonlinear drift resonance between electrons and ULF waves

2020 ◽  
Author(s):  
Xuzhi Zhou ◽  
Li Li ◽  
Yoshiharu Omura ◽  
Qiugang Zong ◽  
Suiyan Fu ◽  
...  
Keyword(s):  
Distribution Functions ◽  
Ulf Waves ◽  
Inner Magnetosphere ◽  
Ultralow Frequency ◽  
Magnetospheric Convection ◽  
Ulf Wave ◽  
Pendulum Equation ◽  
Drift Frequency ◽  
Strong Convection ◽  
Trapping Frequency

<p>In the Earth's inner magnetosphere, charged particles can be accelerated and transported by ultralow frequency (ULF) waves via drift resonance. We investigate the effects of magnetospheric convection on the nonlinear drift resonance process, which provides an inhomogeneity factor S to externally drive the pendulum equation that describes the particle motion in the ULF wave  field. The S factor, defined as the ratio of the driving amplitude to the square of the pendulum trapping frequency, is found to vary with magnetic local time and as a consequence, oscillates quasi-periodically at the particle drift frequency. To better understand the particle behavior governed by the driven pendulum equation, we carry out simulations to obtain the evolution of electron distribution functions in energy and L-shell phase space. We find that resonant electrons can remain trapped by the low-m ULF waves under strong convection electric  field, whereas for high-m ULF waves, the electrons trajectories can be significantly modified. More interestingly, the electron drift frequency is close to the nonlinear trapping frequency for intermediate-m ULF waves, which corresponds to chaotic motion of resonant electrons. These  findings shed new light on the nature of particle coherent and diffusive transport in the inner magnetosphere.</p>

scholarly journals Van Allen Probes observation of plasmaspheric hiss modulated by injected energetic electrons

2018 ◽  
Vol 36 (3) ◽  
pp. 781-791 ◽  
Author(s):  
Run Shi ◽  
Wen Li ◽  
Qianli Ma ◽  
Seth G. Claudepierre ◽  
Craig A. Kletzing ◽  
...  
Keyword(s):  
Plasma Density ◽  
Direct Evidence ◽  
Electron Flux ◽  
Energetic Electron ◽  
Low Frequency ◽  
Wave Intensity ◽  
Electron Population ◽  
Ulf Wave ◽  
Van Allen Probes ◽  
First Time

Abstract. Plasmaspheric hiss was observed by Van Allen Probe B in association with energetic electron injections in the outer plasmasphere. The energy of injected electrons coincides with the minimum resonant energy calculated for the observed hiss wave frequency. Interestingly, the variations in hiss wave intensity, electron flux and ultra low frequency (ULF) wave intensity exhibit remarkable correlations, while plasma density is not correlated with any of these parameters. Our study provides direct evidence for the first time that the injected anisotropic electron population, which is modulated by ULF waves, modulates the hiss intensity in the outer plasmasphere. This also implies that the plasmaspheric hiss observed by Van Allen Probe B in the outer plasmasphere (L > ∼ 5.5) is locally amplified. Meanwhile, Van Allen Probe A observed hiss emission at lower L shells (< 5), which was not associated with electron injections but primarily modulated by the plasma density. The features observed by Van Allen Probe A suggest that the observed hiss deep inside the plasmasphere may have propagated from higher L shells.

Compressional ULF wave modulation of energetic particles in the inner magnetosphere

2016 ◽  
Vol 121 (7) ◽  
pp. 6262-6276 ◽  
Author(s):  
H. Liu ◽  
Q.-G. Zong ◽  
X.-Z. Zhou ◽  
S. Y. Fu ◽  
R. Rankin ◽  
...  
Keyword(s):  
Energetic Particles ◽  
Inner Magnetosphere ◽  
Wave Modulation ◽  
Ulf Wave

scholarly journals Mirror instabilities in the inner magnetosphere and their potential for localized ULF wave generation

2020 ◽  
Author(s):  
M. B. Cooper ◽  
A. J. Gerrard ◽  
L. J. Lanzerotti ◽  
A. R. Soto‐Chavez ◽  
H. Kim ◽  
...  
Keyword(s):  
Wave Generation ◽  
Inner Magnetosphere ◽  
Ulf Wave

Understanding the controlling factors of Ultra-Low Frequency waves and their penetration during geomagnetic storms

2020 ◽  
Author(s):  
Jonathan Rae ◽  
Kyle Murphy ◽  
Clare Watt ◽  
Jasmine Sandhu ◽  
Samuel Wharton ◽  
...  
Keyword(s):  
Solar Wind ◽  
Radiation Belt ◽  
Ring Current ◽  
Geomagnetic Storms ◽  
Particle Interaction ◽  
Low Frequency ◽  
Controlling Factors ◽  
Wave Power ◽  
Inner Magnetosphere ◽  
Ulf Wave

&lt;p&gt;Wave-particle interactions play a key role in radiation belt dynamics. Traditionally, Ultra-Low Frequency (ULF) wave-particle interaction is parameterised statistically by a small number of controlling factors for given solar wind driving conditions or geomagnetic activity levels. Here, we investigate solar wind driving of ultra-low frequency (ULF) wave power and the role of the magnetosphere in screening that power from penetrating deep into the inner magnetosphere. We demonstrate that, during enhanced ring current intensity, the Alfv&amp;#233;n continuum plummets, allowing lower frequency waves to penetrate deeper into the magnetosphere than during quiet periods. With this penetration, ULF wave power is able to accumulate closer to the Earth than characterised by statistical models. During periods of enhanced solar wind driving such as coronal mass ejection driven storms, where ring current intensities maximise, the observed penetration provides a simple physics-based reason for why storm-time ULF wave power is different compared to non-storm time waves. We demonstrate statistically that the ring current plays a pivotal role in allowing ULF wave energy to access the inner magnetosphere and show a new parameterisation of ULF wave power for radiation belt research purposes that is specifically tuned for geomagnetic storms.&lt;/p&gt;

The Inner Magnetosphere Imager mission

1993 ◽  
Author(s):  
Les Johnson ◽  
Melody Herrmann
Keyword(s):  
Inner Magnetosphere
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