  We present an analysis of intermittent processes occurred 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 have
been a analyzed recently for hard X-rays data only. Since in a typical flare
the same accelerated electron population is believed to produce both hard
X-rays and gyrosynchrotron, we compare both time profiles searching for
intermittency signatures. For that we define a cross-wavelet power spectrum,
that is used to obtain the Local Intermittency Measure or LIM. When greater
than three, the square LIM coefficients indicate a local intermittent process.
The 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 only the scales above 10 s producing 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.
