Statistical study of two years of solar flare radio spectra obtained with the owens valley solar array

Gelu Nita, Dale Gary, Jeongwoo Lee

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76 Scopus citations

Abstract

We present results of analysis of 412 flares during 2001-2002 as detected by the Owens Valley Solar Array (OVSA). This is an in-depth study to investigate some results suggested by a previous study of solar bursts (Nita et al. 2002), which was limited to the peak time of the bursts at a few frequency bands. The new study includes the temporal dependence, at 4 s time resolution, of parameters measured at 40 frequencies in the range 1-18 GHz. We investigate distributions of burst parameters such as maximum flux density in the spectra, peak frequency, spectral slopes below and above the peak frequency (optically thick and thin slopes, respectively), and burst durations. We classify the microwave bursts according to their spectral properties and provide tables of averaged spectral parameters for each spectral type and for different frequency and intensity ranges.

Original languageEnglish (US)
Pages (from-to)528-545
Number of pages18
JournalAstrophysical Journal
Volume605
Issue number1 I
DOIs
StatePublished - Apr 10 2004

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: activity
  • Sun: flares
  • Sun: radio radiation

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