Self-Consistent Kinetic Approach for Low Frequency and Quasi-static Electromagnetic Perturbations in Magnetic-Mirror Confined Plasmas

ABSTRACT Feedback from radio jets associated with active galactic nuclei (AGNs) plays a profound role in the evolution of galaxies. Kinetic power of these radio jets appears to show temporal variation, but the mechanism(s) responsible for this process are not yet clear. Recently, the LOw Frequency ARray (LOFAR) has uncovered large populations of active, remnant, and restarted radio jet populations. By focusing on LOFAR data in the Lockman Hole, in this work we use the Radio AGNs in Semi-Analytic Environments (RAiSE) dynamical model to present the first self-consistent modelling analysis of active, remnant, and restarted radio source populations. Consistent with other recent work, our models predict that remnant radio lobes fade quickly. Any high (>10 per cent) observed fraction of remnant and restarted sources therefore requires a dominant population of short-lived jets. We speculate that this could plausibly be provided by feedback-regulated accretion.

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Self-consistent charge dynamics in magnetized dusty plasmas: Low-frequency electrostatic modes

Physical Review E ◽

10.1103/physreve.53.1035 ◽

1996 ◽

Vol 53 (1) ◽

pp. 1035-1041 ◽

Cited By ~ 11

Author(s):

K. D. Tripathi ◽

S. K. Sharma

Keyword(s):

Low Frequency ◽

Dusty Plasmas ◽

Charge Dynamics ◽

Self Consistent

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Leak Width of a Cusp-Confined Plasma

Zeitschrift für Naturforschung A ◽

10.1515/zna-1982-0811 ◽

1982 ◽

Vol 37 (8) ◽

pp. 780-784

Author(s):

G. Knorr ◽

D. Willis

Keyword(s):

Steady State ◽

Charge Distribution ◽

Geometric Mean ◽

The Self ◽

Magnetic Mirror ◽

Plasma Stream ◽

Experimental Measurements ◽

State Calculation ◽

Self Consistent

The theoretical and numerical steady-state calculation of the width of an escaping plasma stream through a magnetic mirror solves the self-consistent potential and charge distribution for a low beta plasma. The leak width is obtained as the geometric mean of the ion and electron Lar-mor radius, also called hybrid width, in agreement with some experimental measurements. If the out-streaming plasma is unstable or collisional, the leak width can only larger, contrary to earlier results in the literature

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Self-consistent retrieval of source parameters using mantle waves

Bulletin of the Seismological Society of America ◽

10.1785/bssa0880040995 ◽

1998 ◽

Vol 88 (4) ◽

pp. 995-1002

Author(s):

Karine Gouget ◽

Pierre F. Ihmlé ◽

Jaime Campos ◽

Jean-Paul Montagner

Keyword(s):

Spectral Synthesis ◽

Source Parameters ◽

Low Frequency ◽

Large Earthquake ◽

Time Function ◽

Inversion Method ◽

Global Networks ◽

Self Consistent ◽

Routine Basis ◽

Narrow Frequency Band

Abstract The large number of high-quality stations from global networks (e.g., IRIS, GEOSCOPE) allows for rapid and robust recovery of source parameters of large earthquakes. We present a self-consistent analysis of surface waves in terms of directivity parameters. The boxcar is often used to recover source parameters but is rarely a faithful representation of an event's time function. We demonstrate that more reliable estimates of directivity parameters can be obtained when we take into account the source time function (STF) of the event. A low-frequency STF is obtained from first (R1) and second (R2) orbit Rayleigh waves in the range 2 to 15 mHz, with a spectral synthesis and inversion method. We measure the differential amplitudes between data and 3D synthetics. We use the R1/R2 ratio of differential amplitudes to invert, in a single narrow-frequency band, for the event's apparent rupture azimuth and velocity. For the Mw 8.1 Chile 1995 event, data are consistent with unilateral southward propagation, with a velocity of about 2.4 km/sec. For the Mw 7.9 Mexico 1995 earthquake, the rupture propagated toward the NW at about 2.0 km/sec. Our low-frequency estimates agree with broadband studies of both events and can be retrieved rapidly on a routine basis after a large earthquake.

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