Detection of Propagating Fast Sausage Waves through Detailed Analysis of a Zebra-pattern Fine Structure in a Solar Radio Burst

K. Kaneda, H. Misawa, K. Iwai, S. Masuda, F. Tsuchiya, Y. Katoh, T. Obara

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Various magnetohydrodynamic (MHD) waves have recently been detected in the solar corona and investigated intensively in the context of coronal heating and coronal seismology. In this Letter, we report the first detection of short-period propagating fast sausage mode waves in a metric radio spectral fine structure observed with the Assembly of Metric-band Aperture Telescope and Real-time Analysis System. Analysis of Zebra patterns (ZPs) in a type-IV burst revealed a quasi-periodic modulation in the frequency separation between the adjacent stripes of the ZPs (Δf ). The observed quasi-periodic modulation had a period of 1-2 s and exhibited a characteristic negative frequency drift with a rate of 3-8 MHz s-1. Based on the double plasma resonance model, the most accepted generation model of ZPs, the observed quasi-periodic modulation of the ZP can be interpreted in terms of fast sausage mode waves propagating upward at phase speeds of 3000-8000 km s-1. These results provide us with new insights for probing the fine structure of coronal loops.

Original languageEnglish
Article numberL29
JournalAstrophysical Journal Letters
Volume855
Issue number2
DOIs
Publication statusPublished - 2018 Mar 10

Keywords

  • Sun: corona
  • Sun: oscillations
  • Sun: radio radiation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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