Time-domain demodulation of RHESSI light curves |
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| Authors: | Arzner Kaspar |
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| Institution: | (1) Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland |
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| Abstract: | This paper presents an algorithm to decompose the modulated RHESSI light curves into periodic functions and a smooth function,
representing the true (demodulated) time profile of an impulsive source. The decomposition is achieved by optimizing a trade-off
between the Poisson likelihood, a smoothness constraint, and conditions on the average grid transmission and the (modulating
or non-modulating) background. The algorithm, which operates on the level of count rates and does not require imaging information,
is verified by numerical simulations and applied to some early RHESSI data, where – as a preliminary result – several impulsive
features on time scales < 4 s may have been identified. |
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