• New classification parameter of solar flares based on the maximum flux in soft X-rays and on duration of flare

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      https://www.ias.ac.in/article/fulltext/joaa/041/0003

    • Keywords

       

      Sun; cycles 23 and 24; flares; CMEs; proton events; geomagnetic indices.

    • Abstract

       

      Solar flare activity is characterized by different classification systems, both in optical and X-ray ranges. The most generally accepted classifications of solar flares describe important parameters of flares such as the maximum of brightness of the flare in the optical range – $H_{\alpha}$ flare class (change from F to B), area of the flare in $H_{\alpha}$ (change from S for areas less than 2 square degrees to 4 for areas more than 24.7 square degrees) and the maximum amplitude of the soft X-ray (SXR)-flux in the band 0.1–0.8 nm ($F^{\rm max}_{0.1−0.8}$) – X-ray flares of classes from C to X. A new classification parameter of solar flares is proposed here – the X-ray index of flare XI, based on GOES measurements of solar radiation in the SXR-range. The XI-index has a clear physical interpretation associated with the total flare energy in the SXR-range. XI is easily calculated for each flare with the use of available GOES data. The XI-index can be used along with other geoeffective parameters of Solaractivity to assess both flares and coronal mass ejections that are connected with them.

    • Author Affiliations

       

      E. A. BRUEVICH1

      1. Sternberg Astronomical Institute, Lomonosov Moscow State University, Universitetsky pr., 13, Moscow, Russia 119992.
    • Dates

       
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