التفاصيل البيبلوغرافية
| العنوان: |
Analysis of Intermittency in Submillimeter Radio and Hard X-Ray Data During the Impulsive Phase of a Solar Flare. |
| المؤلفون: |
Giménez de Castro, G. guigue@craam.mackenzie.br, Simões, P.1, Raulin, J.-P.2, Guimarães, O.2 |
| المصدر: |
Solar Physics. Aug2016, Vol. 291 Issue 7, p2003-2016. 14p. |
| مصطلحات موضوعية: |
*INTERMITTENCY (Nuclear physics), *SUBMILLIMETER waves, *X-rays, *SOLAR flares, *PLASMA turbulence |
| مستخلص: |
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 $\mathit{LIM}$ . When greater than three, the square $\mathit{LIM}$ coefficients indicate a local intermittent process. The $\mathit{LIM}^{2}$ 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. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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