Saturation of electron cyclotron maser by lower-hybrid waves

G. Fleishman, K. Arzner

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We perform a numerical study on the quasilinear relaxation of an electron cyclotron maser on the initially dominant mode. We focus thereby on a situation where the initially dominant modes are quasi-electrostatic lower hybrid (lh) waves, which have not been treated in preceding studies. To this end, we chose 0.2 ≤ ωpBe < 0.5 (ωp: plasma-, ωBe: electron cyclotron frequency) and an initial losscone distribution of energetic electrons of the form f(p, μ) ∼ p-ξe-μ2/μ20 (p: momentum, μ: pitch angle cosine). Superimposed on this is a damping Maxwellian background. From our calculations, we find that multiple peaks in the lower-hybrid wave intensity can occur if the initial loss cone distribution is sufficiently broad. We also find that quasilinear relaxation with respect to lower-hybrid waves does not destroy the capability of the electron distribution to amplify transverse (XOZ) waves, which therefore become dominant at a later stage. The comparison with observations shows that the calculated shape of a single peak in the lower-hybrid energy density displays a remarkable similarity to solar radio spikes.

Original languageEnglish (US)
Pages (from-to)776-788
Number of pages13
JournalAstronomy and Astrophysics
Volume358
Issue number2
StatePublished - Dec 1 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Masers
  • Sun: radio radiation

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