Modeling of the Structure of Long-Period ULF Waves Using Energetic Particle Observations

2013 ◽  
pp. 129-134
Author(s):  
Kazue Takahashi
Keyword(s):  
Energetic Particle ◽  
Ulf Waves ◽  
Long Period

scholarly journals Dynamics of long-period ULF waves in the plasma sheet: Coordinated space and ground observations

2012 ◽  
Vol 117 (A3) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. M. Tian ◽  
Q. G. Zong ◽  
T. L. Zhang ◽  
R. Nakamura ◽  
A. M. Du ◽  
...  
Keyword(s):  
Plasma Sheet ◽  
Ulf Waves ◽  
Long Period

Energetic Particle Sounding of the Magnetopause Deformed by a Hot Flow Anomaly: MMS Observations

2021 ◽  
Author(s):  
Hui Zhang
Keyword(s):  
Time Resolution ◽  
Energetic Particle ◽  
Bow Shock ◽  
High Time ◽  
Radius Of Curvature ◽  
Ulf Waves ◽  
High Time Resolution ◽  
Transient Phenomena ◽  
The Earth ◽  
Plasma Investigation

<p>Hot flow anomalies (HFAs), which are frequently observed near the Earth’s bow shock, are phenomena resulting from the interaction between interplanetary discontinuities and the Earth’s bow shock. Such transient phenomena upstream of the bow shock can cause significant deformation of the bow shock and the magnetopause, generating traveling convection vortices, field-aligned currents, and ULF waves in the Earth’s magnetosphere. A large HFA lasting about 16 minutes was observed by MMS on November 19, 2015. In this study, energetic particle sounding method with high time resolution (150 ms) Fast Plasma Investigation (FPI) data is used to determine the deformed magnetopause distances, orientations, and structures during the interval when MMS crossed the deformed magnetopause. The estimated radius of curvature of the deformed magnetopause is 2.2 R<sub>E</sub>.</p>

Long-Period ULF Waves Driven by Periodic Solar Wind Disturbances

2011 ◽  
pp. 39-45 ◽  
Author(s):  
Shigeru Fujita ◽  
Takashi Tanaka ◽  
Tetsuo Motoba
Keyword(s):  
Solar Wind ◽  
Ulf Waves ◽  
Long Period ◽  
Solar Wind Disturbances

Energetic Particle-Driven ULF Waves in the Ionosphere

2016 ◽  
pp. 1-14 ◽  
Author(s):  
T. K. Yeoman ◽  
M. K. James ◽  
D. Yu. Klimushkin ◽  
P. N. Mager
Keyword(s):  
Energetic Particle ◽  
Ulf Waves

scholarly journals Interaction between long-period ULF waves and charged particle in the magnetosphere: theory and observations (overview)

2021 ◽  
Vol 7 (4) ◽  
pp. 35-69
Author(s):  
Dmitri Klimushkin ◽  
Pavel Mager ◽  
Maksim Chelpanov ◽  
Danila Kostarev
Keyword(s):  
Low Frequency ◽  
High Energy ◽  
Larmor Radius ◽  
Small Scale ◽  
Ulf Waves ◽  
Finite Larmor Radius ◽  
Long Period ◽  
Particle Resonance ◽  
Modulation Methods ◽  
High Energy Particles

The paper reviews the current state of the problem of interaction between long-period ultra-low-frequency (ULF) waves and high-energy particles. We consider elements of the theory of energy exchange between waves and particles, particle transport across magnetic shells under the influence of the electromagnetic field of a wave, the acceleration of radiation belt particles by both resonant and non-resonant mechanisms. We examine the mechanisms of generation of azimuthally-small-scale ULF waves due to instabilities arising from the wave–particle resonance. The cases of Alfvén, drift-compressional, and drift-mirror waves are analyzed. It is noted that due to the lack of a detailed theory of drift-mirror modes, the possibility of their existence in the magnetosphere cannot be taken as a proven fact. We summarize experimental data on the poloidal and compression ULF waves generated by unstable populations of high-energy particles. We investigate the mechanisms of modulation of energetic particle fluxes by ULF waves and possible observational manifestations of such modulation. Methods of studying the structure of waves across magnetic shells by recording fluxes of resonant particles with a finite Larmor radius are discussed.

scholarly journals Interaction between long-period ULF waves and charged particle in the magnetosphere: theory and observations (overview)

2021 ◽  
Vol 7 (4) ◽  
pp. 33-66
Author(s):  
Dmitri Klimushkin ◽  
Pavel Mager ◽  
Maksim Chelpanov ◽  
Danila Kostarev
Keyword(s):  
Low Frequency ◽  
High Energy ◽  
Larmor Radius ◽  
Small Scale ◽  
Ulf Waves ◽  
Finite Larmor Radius ◽  
Long Period ◽  
Particle Resonance ◽  
Modulation Methods ◽  
High Energy Particles

The paper reviews the current state of the problem of interaction between long-period ultra-low-frequency (ULF) waves and high-energy particles. We consider elements of the theory of energy exchange between waves and particles, particle transport across magnetic shells under the influence of the electromagnetic field of a wave, the acceleration of radiation belt particles by both resonant and non-resonant mechanisms. We examine the mechanisms of generation of azimuthally-small-scale ULF waves due to instabilities arising from the wave–particle resonance. The cases of Alfvén, drift-compressional, and drift-mirror waves are analyzed. It is noted that due to the lack of a detailed theory of drift-mirror modes, the possibility of their existence in the magnetosphere cannot be taken as a proven fact. We summarize experimental data on the poloidal and compression ULF waves generated by unstable populations of high-energy particles. We investigate the mechanisms of modulation of energetic particle fluxes by ULF waves and possible observational manifestations of such modulation. Methods of studying the structure of waves across magnetic shells by recording fluxes of resonant particles with a finite Larmor radius are discussed.

On nearly-commensurable periods in the restricted problem of three bodies, with calculations of the long-period variations in the interior 2:1 case

1966 ◽  
Vol 25 ◽  
pp. 197-222 ◽  
Author(s):  
P. J. Message
Keyword(s):  
Periodic Solution ◽  
Periodic Solutions ◽  
Large Amplitude ◽  
Restricted Problem ◽  
Small Amplitude ◽  
Minor Planets ◽  
Long Period ◽  
Numerical Integrations ◽  
Period Variations ◽  
The Mean

An analytical discussion of that case of motion in the restricted problem, in which the mean motions of the infinitesimal, and smaller-massed, bodies about the larger one are nearly in the ratio of two small integers displays the existence of a series of periodic solutions which, for commensurabilities of the typep+ 1:p, includes solutions of Poincaré'sdeuxième sortewhen the commensurability is very close, and of thepremière sortewhen it is less close. A linear treatment of the long-period variations of the elements, valid for motions in which the elements remain close to a particular periodic solution of this type, shows the continuity of near-commensurable motion with other motion, and some of the properties of long-period librations of small amplitude.To extend the investigation to other types of motion near commensurability, numerical integrations of the equations for the long-period variations of the elements were carried out for the 2:1 interior case (of which the planet 108 “Hecuba” is an example) to survey those motions in which the eccentricity takes values less than 0·1. An investigation of the effect of the large amplitude perturbations near commensurability on a distribution of minor planets, which is originally uniform over mean motion, shows a “draining off” effect from the vicinity of exact commensurability of a magnitude large enough to account for the observed gap in the distribution at the 2:1 commensurability.

Discussion following the presentation by F. Deubner

1977 ◽  
Vol 36 ◽  
pp. 69-74
Keyword(s):  
List Type ◽  
The Sun ◽  
Type Number ◽  
Harmonic Motion ◽  
Locally Excited ◽  
Long Period ◽  
Coherent Wave ◽  
Short Period ◽  
Global Modes

The discussion was separated into 3 different topics according to the separation made by the reviewer between the different periods of waves observed in the sun :1) global modes (long period oscillations) with predominantly radial harmonic motion.2) modes with large coherent - wave systems but not necessarily global excitation (300 s oscillation).3) locally excited - short period waves.

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