Sunspot gyroresonance emission at 17 GHz: A statistical study

Angelos Vourlidas, Dale Gary, Kiyoto Shibasaki

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18 Scopus citations

Abstract

We investigate the sunspot gyroresonance emission at 17 GHz using the synoptic database of the Nobeyama Radioheliograph. Our statistical study is based on full disk observations obtained during the maximum of Cycle 22 (1992-94). We study the center-to-limb variation of the brightness and polarization of the sunspot radio emission and present some cases of polarization reversal. We find that the radio emission is most likely 3rd-harmonic gyroresonance emission arising from 2000 G fields in transition region, or low corona temperatures.

Original languageEnglish (US)
Pages (from-to)11-20
Number of pages10
JournalPublications of the Astronomical Society of Japan
Volume58
Issue number1
DOIs
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: activity
  • Sun: corona
  • Sun: radio radiation
  • Sun: sunspots

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