Different Power-Law Indices in the Frequency Distributions of Flares with and without Coronal Mass Ejections | Zendy

S. Yashiro | Zendy; S. Akiyama | Zendy; N. Gopalswamy | Zendy; R. A. Howard | Zendy

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Different Power-Law Indices in the Frequency Distributions of Flares with and without Coronal Mass Ejections

Author(s) -

S. Yashiro,

S. Akiyama,

N. Gopalswamy,

R. A. Howard

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/508876

Subject(s) - coronal mass ejection , physics , flare , astrophysics , solar flare , geostationary operational environmental satellite , power law , nanoflares , flux (metallurgy) , corona (planetary geology) , astronomy , magnetic reconnection , observatory , solar wind , satellite , magnetic field , statistics , mathematics , materials science , astrobiology , venus , metallurgy , quantum mechanics

We investigated the frequency distributions of flares with and withoutcoronal mass ejections (CMEs) as a function of flare parameters (peak flux,fluence, and duration of soft X-ray flares). We used CMEs observed by the LargeAngle and Spectrometric Coronagraph (LASCO) on board the Solar and HeliosphericObservatory (SOHO) mission and soft X-ray flares (C3.2 and above) observed bythe GOES satellites during 1996 to 2005. We found that the distributions obey apower-law of the form: dN/dX~X^-alpha, where X is a flare parameter and dN isthe number of events recorded within the interval [X, X+dX]. For the flareswith (without) CMEs, we obtained the power-law index alpha=1.98+-0.05(alpha=2.52+-0.03) for the peak flux, alpha=1.79+-0.05 (alpha=2.47+-0.11) forthe fluence, and alpha=2.49+-0.11 (alpha=3.22+-0.15) for the duration. Thepower-law indices for flares without CMEs are steeper than those for flareswith CMEs. The larger power-law index for flares without CMEs supports thepossibility that nanoflares contribute to coronal heating.Comment: 4 pages, 2 figures embedded, accepted for publication in ApJ

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