FREQUENCY DEPENDENCE of POLARIZATION of ZEBRA PATTERN in TYPE-IV SOLAR RADIO BURSTS

Kazutaka Kaneda, H. Misawa, K. Iwai, F. Tsuchiya, T. Obara

研究成果: Article査読

11 被引用数 (Scopus)

抄録

We investigated the polarization characteristics of a zebra pattern (ZP) in a type-IV solar radio burst observed with AMATERAS on 2011 June 21 for the purpose of evaluating the generation processes of ZPs. Analyzing highly resolved spectral and polarization data revealed the frequency dependence of the degree of circular polarization and the delay between two polarized components for the first time. The degree of circular polarization was 50%-70% right-handed and it varied little as a function of frequency. Cross-correlation analysis determined that the left-handed circularly polarized component was delayed by 50-70 ms relative to the right-handed component over the entire frequency range of the ZP and this delay increased with the frequency. We examined the obtained polarization characteristics by using pre-existing ZP models and concluded that the ZP was generated by the double-plasma-resonance process. Our results suggest that the ZP emission was originally generated in a completely polarized state in the O-mode and was partly converted into the X-mode near the source. Subsequently, the difference between the group velocities of the O-mode and X-mode caused the temporal delay.

本文言語English
論文番号L45
ジャーナルAstrophysical Journal Letters
808
2
DOI
出版ステータスPublished - 2015 8月 1

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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