scholarly journals Quasilinear analysis of loss‐cone driven weakly relativistic electron cyclotron maser instability

1995 ◽  
Vol 2 (4) ◽  
pp. 1285-1295 ◽  
Author(s):  
L. F. Ziebell ◽  
Peter H. Yoon
Keyword(s):  
Relativistic Electron ◽  
Electron Cyclotron ◽  
Loss Cone ◽  
Electron Cyclotron Maser ◽  
Cyclotron Maser

scholarly journals Radio Emission from Ultrashort-Period Double Degenerate Binaries

2004 ◽  
Vol 21 (3) ◽  
pp. 248-251 ◽  
Author(s):  
A. J. Willes ◽  
K. Wu ◽  
Z. Kuncic
Keyword(s):  
Radio Emission ◽  
Flux Tube ◽  
Current System ◽  
Electron Cyclotron ◽  
Loss Cone ◽  
X Ray ◽  
Electron Cyclotron Maser ◽  
Cyclotron Maser ◽  
Theoretical Predictions ◽  
Orbital Periods

AbstractTiming measurements of periodic X-ray pulses from two ultrashort-period double degenerate binaries, RX J1914+24 and RX J0806+15, show that the rates of change of their orbital periods are consistent with gravitational radiation losses. This contradicts the predictions of models which invoke mass transfer between the two white dwarfs. The X-ray emission is, therefore, unlikely to be powered by accretion processes. The unipolar inductor model explains the source of X-ray emission as electrical dissipation at the base of a flux tube, which connects the magnetic white dwarf to its companion. This model is most consistent with the observed X-ray pulse properties. A similar current system exists in the Jupiter–Io system, where a mildly relativistic electron current produces an auroral footprint at the base of the Io flux tube and highly polarized beamed radio emission by means of the electron cyclotron maser mechanism. Detection of radio emission from RX J1914+24 and RX J0806+15 would thus provide further support for the unipolar inductor model. We present theoretical predictions, based on a loss-cone-driven electron cyclotron maser model, of radio fluxes from systems with parameters similar to RX J1914+24 and RX J0806+15.

Two Mechanisms in a Relativistic Electron Cyclotron Maser with a Special Quasioptical Cavity

1995 ◽  
Vol 12 (10) ◽  
pp. 597-600
Author(s):  
Liu Pukun ◽  
Yang Zhonghai ◽  
Liu Shenggang ◽  
Qian Shangjie
Keyword(s):  
Relativistic Electron ◽  
Electron Cyclotron ◽  
Electron Cyclotron Maser ◽  
Cyclotron Maser

Kinetic theory of high-relativistic electron cyclotron maser with a novel quasioptical cavity

1995 ◽  
Vol 23 (2) ◽  
pp. 156-162
Author(s):  
Pu-Kun Liu ◽  
Zhong-Hai Yang ◽  
Shang-Jie Qian ◽  
Sheng-Gang Liu
Keyword(s):  
Kinetic Theory ◽  
Relativistic Electron ◽  
Electron Cyclotron ◽  
Electron Cyclotron Maser ◽  
Cyclotron Maser

Electron-cyclotron maser theory for extraordinary Bernstein waves

1997 ◽  
Vol 58 (1) ◽  
pp. 171-191 ◽  
Author(s):  
A. J. WILLES ◽  
P. A. ROBINSON
Keyword(s):  
Electron Distribution ◽  
Electron Cyclotron ◽  
Loss Cone ◽  
Wave Growth ◽  
Electron Cyclotron Maser ◽  
Cyclotron Maser ◽  
Hybrid Frequency ◽  
Bernstein Waves ◽  
Bernstein Wave ◽  
Cyclotron Harmonic

Electron-cyclotron maser emission is investigated in the regime where wave growth in the electrostatic Bernstein modes dominates (ωp/Ωe>1.5). A semirelativistic growth rate is derived assuming that the wave dispersion is dominated by a cool background electron distribution and the instability is driven by a low-density hot loss-cone-like electron distribution. The properties of Bernstein wave growth are most strongly dependent on the relative temperatures of the hot and cool electron distributions. For Thot/Tcool[gsim ]10, the fastest growing Bernstein waves are produced at frequencies just below each cyclotron harmonic in Bernstein modes lying below the upper-hybrid frequency. For Thot/Tcool[lsim ]10, additional Bernstein modes above the upper-hybrid frequency are excited, with wave frequencies in each excited mode lying significantly above the corresponding cyclotron harmonic. The dependence of Bernstein wave growth on the relative hot and cool electron number densities and emission angle is also discussed.

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