Observation of Increased Ion Cyclotron Resonance Signal Duration through Electric Field Perturbations

2005 ◽  
Vol 77 (18) ◽  
pp. 5973-5981 ◽  
Author(s):  
Nathan K. Kaiser ◽  
James E. Bruce
Keyword(s):  
Electric Field ◽  
Cyclotron Resonance ◽  
Signal Duration ◽  
Ion Cyclotron Resonance ◽  
Resonance Signal ◽  
Ion Cyclotron

Ion cyclotron resonance signal-detection at multiples of the cyclotron frequency

1990 ◽  
Vol 4 (5) ◽  
pp. 144-146 ◽  
Author(s):  
E. N. Nikolaev ◽  
M. V. Gorshkov ◽  
A. V. Mordehai ◽  
V. L. Talrose
Keyword(s):  
Signal Detection ◽  
Cyclotron Resonance ◽  
Cyclotron Frequency ◽  
Ion Cyclotron Resonance ◽  
Resonance Signal ◽  
Ion Cyclotron

Direct Measurement of Ion Cyclotron Resonance Between Wave Fields and Protons in Space Plasmas

2021 ◽  
Author(s):  
Qiaowen Luo ◽  
Xingyu Zhu ◽  
Jiansen He ◽  
Jun Cui ◽  
Hairong Lai ◽  
...  
Keyword(s):  
Kinetic Theory ◽  
Electric Field ◽  
Velocity Distribution ◽  
Wave Field ◽  
Cyclotron Resonance ◽  
Space Plasmas ◽  
Ion Cyclotron Resonance ◽  
Wave Fields ◽  
Ion Cyclotron Waves ◽  
Ion Cyclotron

<p>Ion cyclotron resonance is one of the fundamental energy conversion processes through wave field-particle interaction in collisionless plasma. However, the key evidence for cyclotron resonance (i.e., the coherence between wave field and ion phase space density pertaining to the ion cyclotron resonance and responsible for the dissipation of ion cyclotron waves (ICWs)) has yet to be directly observed. Based on the high-quality measurements of space plasma by the Magnetospheric Multiscale (MMS) satellites, we observe that both the wave electromagnetic field vectors and the disturbed ion velocity distribution rotate around the background magnetic field. Moreover, we find that the gyrophase angle difference between the fluctuations in the ion velocity distribution functions and the wave electric field vectors are always in the range of (0, 90) degrees, clearly suggesting the ongoing energy conversion from wave fields to particles. By invoking plasma kinetic theory, we find that the field-particle correlation for the dissipative ion cyclotron waves in the theoretical model matches well with our observations. Furthermore, all the wave electric field vectors (Ewave), the ion current (Ji) and the energy transfer rate (Ji ·Ewave) exhibit quasi-periodic oscillations, and the frequency of Ji ·Ewave is about twice the frequency of Ewave and Ji, consistent with plasma kinetic theory. Therefore, our combined analysis of MMS observations and kinetic theory provides direct, thorough, and comprehensive evidence for ICW dissipation in space plasmas.</p>

Analysis of Ion Motion in Ion Cyclotron Resonance Cells

1974 ◽  
Vol 52 (5) ◽  
pp. 426-435 ◽  
Author(s):  
Thomas F. Knott ◽  
M. Riggin
Keyword(s):  
Electric Field ◽  
Resonance Frequency ◽  
Drift Velocity ◽  
Cyclotron Resonance ◽  
Experimental Results ◽  
Ion Cyclotron Resonance ◽  
Cyclotron Motion ◽  
Ion Motion ◽  
Similar Dependence ◽  
Ion Cyclotron

The detailed discussion of ion motion in ion cyclotron resonance cells forms the basis of any interpretation of experimental results. We show that the resonance frequency of (quasi-) cyclotron motion is a function of the ion's position in the cell, and that its drift velocity exhibits a similar dependence. These features of the motion are due to the complicated multipole structure of the electric field. In spite of this, we find simple expressions for the ion coordinates as functions of time.

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