scholarly journals Excitation of extremely low-frequency chorus emissions: The role of background plasma density

2019 ◽  
Vol 3 (1) ◽  
pp. 1-7 ◽  
Author(s):  
XiongDong Yu ◽  
◽  
ZhiGang Yuan ◽  
ShiYong Huang ◽  
Fei Yao ◽  
...  
Keyword(s):  
Plasma Density ◽  
Low Frequency ◽  
Background Plasma ◽  
Extremely Low Frequency

The role of voltage-gated Ca 2+ channels in neurite growth of cultured chromaffin cells induced by extremely low frequency (ELF) magnetic field stimulation

1998 ◽  
Vol 291 (2) ◽  
pp. 217-230 ◽  
Author(s):  
Consuelo Morgado-Valle ◽  
Leticia Verdugo-Díaz ◽  
David E. García ◽  
Christian Morales-Orozco ◽  
R. Drucker-Colín
Keyword(s):  
Magnetic Field ◽  
Chromaffin Cells ◽  
Low Frequency ◽  
Neurite Growth ◽  
Field Stimulation ◽  
Extremely Low Frequency ◽  
Voltage Gated ◽  
Elf Magnetic Field

scholarly journals Effect of thermal pressure on upward plasma fluxes due to ponderomotive force of Alfvén waves

2011 ◽  
Vol 18 (2) ◽  
pp. 235-241 ◽  
Author(s):  
A. K. Nekrasov ◽  
F. Z. Feygin
Keyword(s):  
Magnetic Moment ◽  
Ponderomotive Force ◽  
Standing Waves ◽  
Low Frequency ◽  
Alfven Waves ◽  
Background Plasma ◽  
Alfvén Waves ◽  
Thermal Pressure ◽  
Plasma Displacement

Abstract. We consider the action of the ponderomotive force of low-frequency Alfvén waves on the distribution of the background plasma. It is assumed that the ponderomotive force for traveling waves arises as a result of the background inhomogeneity of medium under study. Expressions for the ponderomotive force obtained in this paper differ from previous analogous results. The induced magnetic moment of medium is taken into account. It is shown that the well-known Pitayevsky's formula for the magnetic moment is not complete. The role of the induced nonlinear thermal pressure in the evolution of the background plasma is considered. We give estimations for plasma displacement due to the long- and short-acting nonlinear wave perturbations. Some discussion of the ponderomotive action of standing waves is provided.

Spectral analysis of arterial blood pressure and raphe magnus neuronal activity in anesthetized rats

1996 ◽  
Vol 271 (2) ◽  
pp. R483-R489 ◽  
Author(s):  
C. G. Leung ◽  
P. Mason
Keyword(s):  
Blood Pressure ◽  
Arterial Blood Pressure ◽  
Low Frequency ◽  
Extremely Low Frequency ◽  
Arterial Blood ◽  
Raphe Magnus ◽  
Nociceptive Processing ◽  
Low Blood Pressure ◽  
On And Off Cells

Recent evidence suggests that nociceptive modulatory cells in the nucleus raphe magnus (RM) and adjacent nucleus reticularis magnocellularis (NRMC) may participate in the modulation of autonomic processing. Therefore, spectral analyses were used to determine component frequencies common to both arterial blood pressure and the activity of RM/NRMC neurons in rats lightly anesthetized with isoflurane. These analyses detected powerful, extremely low frequency (period length: 6.4-18.5 min) oscillations in arterial blood pressure and in the activity of two classes of RM/NRMC neurons, ON and OFF cells. All ON cells discharged during periods of low blood pressure, whereas all OFF cells discharged during periods of high blood pressure. In contrast, the discharge of NEUTRAL and REGULAR cells did not have a consistent relationship to blood pressure. The role of these cells in nociceptive modulation is also unclear. The results presented indicate that ON and OFF cells may participate in the modulation of both autonomic and nociceptive processing.

The generatin of extremely low-frequency chorus waves associated with plasma density enhancement

2021 ◽  
Author(s):  
Qian He ◽  
Si Liu
Keyword(s):  
Plasma Density ◽  
Low Frequency ◽  
Satellite Orbit ◽  
Correlated Data ◽  
Relativistic Electrons ◽  
Generation Process ◽  
Extremely Low Frequency ◽  
Chorus Waves ◽  
Open Question ◽  
Scattering Losses

<p>Chorus waves with extremely low frequency (ELF) below 0.1 f<sub>ce</sub> are proposed to be a potential mechanism of scattering losses of relativistic electrons in the radiation belt. However, the generation of ELF chorus is still an open question. Here we report three interesting events that the occurrence of ELF chorus waves shows evident correlation with the increase of background plasma density while the disturbance of ambient magnetic field is negligible. We calculate the growth rate of chorus waves by using the correlated data of waves and particles form the Van Allen Probes. The calculated growth rates agree well with the wave along the satellite orbit. The current study suggests that the plasma density may play an important role on controlling the wave frequency during the chorus generation process.</p>

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