To the theory of the MHD waves in the inner magnetosphere of the Earth

2001 ◽  
Vol 7 (5-6) ◽  
pp. 44-63 ◽  
Author(s):  
O.K. Cheremnykh ◽  
◽  
O.S. Burdo ◽  
I.A. Kremenetsky ◽  
A.S. Parnowski ◽  
...  
Keyword(s):  
Mhd Waves ◽  
Inner Magnetosphere ◽  
The Earth

Theory of low-scale mhd waves in the near equatorial region of the earth plasmasphere

2001 ◽  
Vol 7 (2s) ◽  
pp. 74-83
Author(s):  
O.S. Burdo ◽  
◽  
O.K. Cheremnykh ◽  
O.P. Verkhoglyadova ◽  
◽  
...  
Keyword(s):  
Equatorial Region ◽  
Mhd Waves ◽  
The Earth

scholarly journals Eigenmode analysis of ballooning perturbations in the inner magnetosphere of the Earth

2007 ◽  
Vol 25 (6) ◽  
pp. 1391-1403 ◽  
Author(s):  
A. S. Parnowski
Keyword(s):  
Stability Criterion ◽  
Geomagnetic Field ◽  
Finite Conductivity ◽  
Nonlinear Structures ◽  
Magnetic Hydrodynamics ◽  
Longitudinal Displacement ◽  
Inner Magnetosphere ◽  
Transversal Displacement ◽  
The Earth ◽  
Eigenmode Analysis

Abstract. We analyze coupled Alfvén and slow magnetosonic eigenmodes in a dipole geomagnetic field with different ionospheric conductivities in the framework of ideal magnetic hydrodynamics (MHD) with finite pressure. We use numerical and, if possible, analytical methods to describe eigenmode frequencies, growth rates and eigenfunctions. The spectrum of Alfvén and slow magnetosonic modes is discrete and equidistant. The frequencies of the first Alfvén and slow magnetosonic eigenmodes are estimated as ~1 Hz and ~1 mHz, respectively. In the case of finite conductivity, periodic and aperiodic modes are separated and their interaction analyzed. It was shown that periodic and aperiodic perturbations can mutually transform into each other. A new flute stability criterion is derived (α~4.25), which is stricter than the Gold criterion (α=20/3). Here, as usual, α=−L/p dp/dL. For flute perturbations, the deviations of transversal displacement from a constant are calculated. An approximation for longitudinal displacement is derived. We determined the position of the main longitudinal peak, which can be responsible for nonlinear structures observed by Freja. An influence of nonlinear terms in pressure is estimated as well.

The theory of ballooning perturbations in the inner magnetosphere of the Earth

2004 ◽  
Vol 33 (5) ◽  
pp. 769-773 ◽  
Author(s):  
O.K Cheremnykh ◽  
A.S Parnowski
Keyword(s):  
Inner Magnetosphere ◽  
The Earth

Ballooning perturbations in the inner magnetosphere of the Earth: Spectrum, stability and eigenmode analysis

2008 ◽  
Vol 41 (10) ◽  
pp. 1682-1687 ◽  
Author(s):  
A.V. Agapitov ◽  
O.K. Cheremnykh ◽  
A.S. Parnowski
Keyword(s):  
Inner Magnetosphere ◽  
The Earth ◽  
Eigenmode Analysis

scholarly journals Plasma Waves in the Inner Magnetosphere

2021 ◽  
pp. 85-119
Author(s):  
Hannu E. J. Koskinen ◽  
Emilia K. J. Kilpua
Keyword(s):  
Radiation Belt ◽  
Low Frequency ◽  
Plasma Waves ◽  
Mhd Waves ◽  
Particle Interactions ◽  
Inner Magnetosphere ◽  
Very Low Frequency ◽  
Link Type ◽  
Wave Modes

AbstractUnderstanding the role of plasma waves, extending from magnetohydrodynamic (MHD) waves at ultra-low-frequency (ULF) oscillations in the millihertz range to very-low-frequency (VLF) whistler-mode emissions at frequencies of a few kHz, is necessary in studies of sources and losses of radiation belt particles. In order to make this theoretically heavy part of the book accessible to a reader, who is not familiar with wave–particle interactions, we have divided the treatise into three chapters. In the present chapter we introduce the most important wave modes that are critical to the dynamics of radiation belts. The drivers of these waves are discussed in Chap. 10.1007/978-3-030-82167-8_5 and the roles of the wave modes as sources and losses of radiation belt particles are dealt with in Chap. 10.1007/978-3-030-82167-8_6.

scholarly journals Storm-time meridional flows: a comparison of CINDI observations and model results

2014 ◽  
Vol 32 (6) ◽  
pp. 659-668 ◽  
Author(s):  
M. Hairston ◽  
N. Maruyama ◽  
W. R. Coley ◽  
R. Stoneback
Keyword(s):  
Electric Field ◽  
Geomagnetic Storm ◽  
Electric Fields ◽  
Previous Analysis ◽  
Coupled Model ◽  
Polar Ionosphere ◽  
Inner Magnetosphere ◽  
Ion Flow ◽  
The Earth ◽  
Coupling Processes

Abstract. During a large geomagnetic storm, the electric field from the polar ionosphere can expand far enough to affect the mid-latitude and equatorial electric fields. These changes in the equatorial zonal electric field, called the penetration field, will cause changes in the meridional ion flows that can be observed by radars and spacecraft. In general this E × B ion flow near the equator caused by the penetration field during undershielding conditions will be upward on the dayside and downward on the nightside of the Earth. Previous analysis of the equatorial meridional flows observed by CINDI instrument on the C/NOFS spacecraft during the 26 September 2011 storm showed that all of the response flows on the dayside were excess downward flows instead of the expected upward flows. These observed storm-time responses are compared to a prediction from a physics-based coupled model of thermosphere–ionosphere–inner-magnetosphere in an effort to explain these observations. The model results suggest that the equatorial downward flow could be attributed to a combined effect of the overshielding and disturbance dynamo processes. However, some discrepancy between the model and observation indicates a need for improving our understanding of how sensitive the equatorial electric field is to various model input parameters that describe the magnetosphere–ionosphere coupling processes.

Global models of the inner electron radiation belt and slot region investigating the effects of VLF transmitter waves

2020 ◽  
Author(s):  
Johnathan Ross ◽  
Sarah Glauert ◽  
Richard Horne ◽  
Nigel Meredith ◽  
Mark Clilverd
Keyword(s):  
Radiation Belt ◽  
Low Frequency ◽  
Particle Interactions ◽  
Electron Dynamics ◽  
Global Models ◽  
Inner Magnetosphere ◽  
The Earth ◽  
Radiation Belt Electrons ◽  
Wave Particle Interactions ◽  
Earth Orbits

<p>Signals from man-made very low frequency (VLF) transmitters can leak from the Earth-ionosphere wave guide into the inner magnetosphere, where they propagate in the whistler mode and contribute to electron dynamics in the inner radiation belt and slot region through wave-particle interactions. These inner regions of the magnetosphere are becoming increasingly important from a satellite perspective. For instance, the newly populated Medium Earth Orbits pass though the slot region, and satellites launched via electric orbit raising are exposed to the inner belt and slot region for extended periods of time.</p><p>We have calculated diffusion coefficients associated with wave-particle interactions between radiation belt electrons and waves from each of the strongest VLF transmitters using Van Allen Probe observations. These coefficients are included into global models of the radiation belts to assess the importance of the effects of VLF transmitters individually and collectively on electron populations.</p>

scholarly journals Investigation of perturbations and collective motions of plasma in the inner magnetosphere of the Earth

2008 ◽  
Vol 14 (5) ◽  
pp. 95-106
Author(s):  
O.K. Cheremnykh ◽  
◽  
A.S. Parnowski ◽  
A.V. Agapitov ◽  
◽  
...  
Keyword(s):  
Inner Magnetosphere ◽  
The Earth ◽  
Collective Motions
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