scholarly journals Discovery of electron cyclotron MASER emission from the magnetic Bp star HD 133880 with the Giant Metrewave Radio Telescope

2017 ◽  
Vol 474 (1) ◽  
pp. L61-L65 ◽  
Author(s):  
Barnali Das ◽  
Poonam Chandra ◽  
Gregg A Wade
Keyword(s):  
Radio Telescope ◽  
Electron Cyclotron ◽  
Maser Emission ◽  
Electron Cyclotron Maser ◽  
Cyclotron Maser

Electron-Cyclotron maser emission from streaming distributions

1994 ◽  
Vol 51 (1) ◽  
pp. 75-93 ◽  
Author(s):  
A. J. Willes ◽  
P. A. Robinson
Keyword(s):  
Growth Rate ◽  
Geometric Analysis ◽  
Electron Cyclotron ◽  
Mean Velocity ◽  
Maser Emission ◽  
Electron Cyclotron Maser ◽  
Cyclotron Maser ◽  
Electron Distributions ◽  
Field Lines ◽  
Elliptically Polarized

Motivated by the need to explain observed elliptically polarized emission from Jupiter, the mechanism of electron-cyclotron maser emission is considered for drifting electron distributions, where the electrons stream with a non-zero mean velocity parallel to the magnetic field lines. An analytical expression for the semirelativistic growth rate is derived and its properties analysed in detail for waves generated in the magneto-ionic modes. The main features of the growth rate are discussed, on the basis of a geometric analysis using resonant ellipses.

scholarly journals Maser Emission in Astrophysical Plasmas: 2003 Robert Ellery Lecture

2005 ◽  
Vol 22 (2) ◽  
pp. 144-152 ◽  
Author(s):  
Don Melrose
Keyword(s):  
Free Energy ◽  
Electron Cyclotron ◽  
Natural Mode ◽  
Plasma Emission ◽  
Radio Bursts ◽  
Astrophysical Plasmas ◽  
Maser Emission ◽  
Electron Cyclotron Maser ◽  
Cyclotron Maser ◽  
Coherent Emission

AbstractThere are three distinct types of ‘coherent emission’ in astrophysical plasmas: plasma emission (e.g. in solar radio bursts), electron cyclotron maser emission (e.g. in Jupiter's radio bursts), and pulsar radio emission. The development and current status of our understanding of coherent emission is reviewed, concentrating on plasma emission and electron cyclotron maser emission for which there is direct information on the distributions of electrons that produce the radiation. A generic model for a coherent emission process involves a maser generating radiation in a natural mode of the ambient plasma, and operating near marginal stability. A specific coherent emission mechanism involves the form of free energy to drive the maser, a pump that provides the free energy, and the plasma instability that leads to wave growth. The nature of coherence and its measurement through higher order intensity correlations are discussed.

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