### Abstract

Original language | English |
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Article number | 095002 |

Number of pages | 10 |

Journal | Plasma Physics and Controlled Fusion |

Volume | 58 |

Issue number | 9 |

DOIs | |

Publication status | Published - 27 Jul 2016 |

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### Keywords

- electrostatic electron cyclotron instability
- thermal ring distribution
- delta-function ring distribution
- bernstein modes
- Maxwellian distribution
- ionospheric heating
- magnetized plasmas

### Cite this

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**Electrostatic electron cyclotron instabilities near the upper hybrid layer due to electron ring distributions.** / Eliasson, B.; Speirs, D. C.; Daldorff, L. K. S.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Electrostatic electron cyclotron instabilities near the upper hybrid layer due to electron ring distributions

AU - Eliasson, B.

AU - Speirs, D. C.

AU - Daldorff, L. K. S.

PY - 2016/7/27

Y1 - 2016/7/27

N2 - A theoretical study is presented of the electrostatic electron cyclotron instability involving Bernstein modes in a magnetized plasma. The presence of a tenuous thermal ring distribution in a Maxwellian plasma decreases the frequency of the upper hybrid branch of the electron Bernstein mode until it merges with the nearest lower branch with a resulting instability. The instability occurs when the upper hybrid frequency is somewhat above the third, fourth, and higher electron cyclotron harmonics, and gives rise to a narrow spectrum of waves around the electron cyclotron harmonic nearest to the upper hybrid frequency. For a tenuous cold ring distribution together with a Maxwellian distribution an instability can take place also near the second electron cyclotron harmonic. Noise-free Vlasov simulations are used to assess the theoretical linear growth-rates and frequency spectra, and to study the nonlinear evolution of the instability. The relevance of the results to laboratory and ionospheric heating experiments is discussed.

AB - A theoretical study is presented of the electrostatic electron cyclotron instability involving Bernstein modes in a magnetized plasma. The presence of a tenuous thermal ring distribution in a Maxwellian plasma decreases the frequency of the upper hybrid branch of the electron Bernstein mode until it merges with the nearest lower branch with a resulting instability. The instability occurs when the upper hybrid frequency is somewhat above the third, fourth, and higher electron cyclotron harmonics, and gives rise to a narrow spectrum of waves around the electron cyclotron harmonic nearest to the upper hybrid frequency. For a tenuous cold ring distribution together with a Maxwellian distribution an instability can take place also near the second electron cyclotron harmonic. Noise-free Vlasov simulations are used to assess the theoretical linear growth-rates and frequency spectra, and to study the nonlinear evolution of the instability. The relevance of the results to laboratory and ionospheric heating experiments is discussed.

KW - electrostatic electron cyclotron instability

KW - thermal ring distribution

KW - delta-function ring distribution

KW - bernstein modes

KW - Maxwellian distribution

KW - ionospheric heating

KW - magnetized plasmas

UR - http://iopscience.iop.org/journal/0741-3335

U2 - 10.1088/0741-3335/58/9/095002

DO - 10.1088/0741-3335/58/9/095002

M3 - Article

VL - 58

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 9

M1 - 095002

ER -