Abstract The electron cyclotron maser (ECM) instability is a very important nonthermal radiation mechanism. It has been developed by proposing various distribution functions as well the relativistic resonance condition, called semirelativistic correction. Taking account of effects both velocity energetic electrons and fully correction, present paper investigates ECM driven power-law with low-en...

We investigate the possibility of an electron cyclotron maser operating in a hot (T > 107K) thermal plasma with a loss cone. We find that the instability can occur in this scenario because resonance involving electrons in the thermal tail can give rise to significantly large growth rates. We estimate the range of electron velocities that can be in resonance and show how this dictates the freque...

It is now known from Yohkoh Hard X-ray Telescope observations that double (or even multiple) hard X-ray sources in flares are a common occurrence. These sources, which are positioned at the feet of coronal soft X-ray loops, are synchronised to within 0.1s and have similar spectra, strongly suggesting that they are produced by a single population of electrons accelerated/injected at some point i...

Oscillator and amplifier cyclotron-resonance-maser (CRM) experiments in a spiral bifilar waveguide are presented in this paper. The slow-wave CRM device employs a low-energy low-current electron beam (2-12 keV, approximately 0.5 A). The pitch angle of the helical waveguide is relatively small; hence, the phase velocity in this waveguide, V(ph) congruent with0.8c (where c is the speed of light),...

A theory of pulsar radio emission generation, in which the observed waves are produced directly by maser-type plasma instabilities operating at the anomalous cyclotron-Cherenkov resonance ω − k‖v‖ + ωB/ γres = 0 and the Cherenkov-drift resonance ω − k‖v‖ − k⊥ud = 0, is capable of explaining the main observational characteristics of pulsar radio emission. The instabilities are due to the interac...

ABSTRACT We investigate the atmospheric and magnetospheric conditions of massive, close-in exoplanet ? Andromedae b (hereafter ups And b). In particular, we explore whether radio emission can be produced by Cyclotron Maser Instability (CMI), this escape from its source region. For this, compare local cyclotron frequency to plasma frequency. The planetary mass has a decisive impact on both these...

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