• DOI:10.1007/s11207-016-0949-3
• Corpus ID: 3152118

Analysis of Intermittency in Submillimeter Radio and Hard X-Ray Data During the Impulsive Phase of a Solar Flare

@article{GimnezdeCastro2016AnalysisOI,
  title={Analysis of Intermittency in Submillimeter Radio and Hard X-Ray Data During the Impulsive Phase of a Solar Flare},
  author={G. Gim{\'e}nez de Castro and Paulo J. A. Sim{\~o}es and Jean Pierre Raulin and O M Guimaraes},
  journal={Solar Physics},
  year={2016},
  volume={291},
  pages={2003-2016}
}

• G. Giménez de Castro, P. Simões, +1 author O. M. Guimaraes
• Published 24 May 2016
• Physics
• Solar Physics

We present an analysis of intermittent processes occurring during the impulsive phase of the flare SOL2012-03-13, using hard X-rays and submillimeter radio data. Intermittency is a key characteristic in turbulent plasmas and has so far only been analyzed for hard X-ray data. Since in a typical flare the same accelerated electron population is believed to produce both hard X-rays and gyrosynchrotron radiation, we compare the two time profiles by searching for intermittency signatures. For this, we define a cross-wavelet power spectrum, which is used to obtain the local intermittency measure, or LIM$\mathit{LIM}$. When greater than three, the square LIM$\mathit{LIM}$ coefficients indicate a local intermittent process. The LIM2$\mathit{LIM}^{2}$ coefficient distribution in time and scale helps to identify avalanche or cascade energy release processes. We find two different and well-separated intermittent behaviors in the submillimeter data: for scales greater than 20 s, a broad distribution during the rising and maximum phases of the emission seems to favor a cascade process; for scales below 1 s, short pulses centered on the peak time are representative of avalanches. When applying the same analysis to hard X-rays, we find that only the scales above 10 s produce a distribution related to a cascade energy fragmentation. Our results suggest that different acceleration mechanisms are responsible for tens of keV and MeV energy ranges of electrons.