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Abstract:

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. When greater than three, the square LIM coefficients indicate a local intermittent process. The LIM2 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. © 2016, Springer Science+Business Media Dordrecht.

Registro:

Documento: Artículo
Título:Analysis of Intermittency in Submillimeter Radio and Hard X-Ray Data During the Impulsive Phase of a Solar Flare
Autor:Giménez de Castro, G.; Simões, P.J.A.; Raulin, J.-P.; Guimarães, O.M., Jr.
Filiación:CRAAM, Universidade Presbiteriana Mackenzie, São Paulo, Brazil
IAFE, Universidad de Buenos Aires, Buenos Aires, Argentina
SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom
Palabras clave:Avalanche models; Hard X-rays, Solar flares; Intermittency; Microwave, Solar flares; Wavelets
Año:2016
Volumen:291
Número:7
Página de inicio:2003
Página de fin:2016
DOI: http://dx.doi.org/10.1007/s11207-016-0949-3
Título revista:Solar Physics
Título revista abreviado:Sol. Phys.
ISSN:00380938
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v291_n7_p2003_GimenezdeCastro

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Citas:

---------- APA ----------
Giménez de Castro, G., Simões, P.J.A., Raulin, J.-P. & Guimarães, O.M., Jr. (2016) . Analysis of Intermittency in Submillimeter Radio and Hard X-Ray Data During the Impulsive Phase of a Solar Flare. Solar Physics, 291(7), 2003-2016.
http://dx.doi.org/10.1007/s11207-016-0949-3
---------- CHICAGO ----------
Giménez de Castro, G., Simões, P.J.A., Raulin, J.-P., Guimarães, O.M., Jr. "Analysis of Intermittency in Submillimeter Radio and Hard X-Ray Data During the Impulsive Phase of a Solar Flare" . Solar Physics 291, no. 7 (2016) : 2003-2016.
http://dx.doi.org/10.1007/s11207-016-0949-3
---------- MLA ----------
Giménez de Castro, G., Simões, P.J.A., Raulin, J.-P., Guimarães, O.M., Jr. "Analysis of Intermittency in Submillimeter Radio and Hard X-Ray Data During the Impulsive Phase of a Solar Flare" . Solar Physics, vol. 291, no. 7, 2016, pp. 2003-2016.
http://dx.doi.org/10.1007/s11207-016-0949-3
---------- VANCOUVER ----------
Giménez de Castro, G., Simões, P.J.A., Raulin, J.-P., Guimarães, O.M., Jr. Analysis of Intermittency in Submillimeter Radio and Hard X-Ray Data During the Impulsive Phase of a Solar Flare. Sol. Phys. 2016;291(7):2003-2016.
http://dx.doi.org/10.1007/s11207-016-0949-3