Effects of the Lower Energy Cutoff Behavior of Power-Law Electrons on the Electron-Cyclotron Maser Instability

Details Effects of the Lower Energy Cutoff Behavior of Power-Law Electrons on the Electron-Cyclotron Maser Instability Effects of the Lower Energy Cutoff Behavior of Power-Law Electrons on the Electron-Cyclotron Maser Instability

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...677l.125w&link_type=abstract

The Astrophysical Journal, Volume 677, Issue 2, pp. L125-L128.

Astronomy and Astrophysics

Astronomy

5

Masers, Plasmas, Radiation Mechanisms: Nonthermal, Sun: Radio Radiation

Scientific paper

The electron-cyclotron maser (ECM) instability is an important mechanism that directly amplifies electromagnetic radiation by nonthermal energetic electrons trapped in magnetic fields. Major astrophysical observations, on the other hand, imply that the energetic electrons frequently exhibit an energy distribution with a negative power-law spectrum. In this Letter, the lower energy cutoff behavior of the power-law electrons and its effects on the ECM instability are discussed. We introduce steepness index δ and cutoff energy Ec to describe the cutoff behavior of the power-law electrons and demonstrate that the power-law electrons with the steepness cutoff of δ>α can efficiently excite the ECM instability, where α is the spectrum of the power-law electrons, and that the growth rates of radiative waves in the O and X modes all increase with both the steepness index δ and cutoff energy Ec, but the growth rate of the X mode is considerably larger than that of the O mode. For the saturation cutoff case of δ<=α, on the other hand, the power-law electrons cannot drive the ECM instability.

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