Imaging from STIX visibility amplitudes

Imaging from STIX visibility amplitudes. Massa, P., Perracchione, E., Garbarino, S., Battaglia, A. F., Benvenuto, F., Piana, M., Hurford, G., & Krucker, S. Astronomy & Astrophysics, 656:A25, December, 2021.

Paper doi abstract bibtex

Methods. We used a parametric imaging approach whereby STIX visibility amplitudes are ﬁtted by means of two non-linear optimization methods: a fast meta-heuristic technique inspired by social behavior and a Bayesian Monte Carlo sampling method that, although slower, provides a better way of quantifying the uncertainties. Results. When applied to a set of solar ﬂare visibility amplitudes recorded by STIX on November 18, 2020, the two parametric methods provide very coherent results. The analysis also demonstrates the ability of STIX to reconstruct data at a high time resolution and, from a spectral viewpoint, it shows the reliability of a double-source scenario that is consistent with a thermal versus nonthermal interpretation. Conclusions. In this preliminary analysis of STIX imaging based only on visibility amplitudes, we formulate the imaging problem as a non-linear parametric issue addressed by means of two high-performance optimization techniques that both show the ability to sample the parametric space in an eﬀective fashion, thus avoiding any local minima.

@article{massa_imaging_2021,
	title = {Imaging from {STIX} visibility amplitudes},
	volume = {656},
	issn = {0004-6361, 1432-0746},
	url = {https://www.aanda.org/10.1051/0004-6361/202140946},
	doi = {10.1051/0004-6361/202140946},
	abstract = {Methods. We used a parametric imaging approach whereby STIX visibility amplitudes are ﬁtted by means of two non-linear optimization methods: a fast meta-heuristic technique inspired by social behavior and a Bayesian Monte Carlo sampling method that, although slower, provides a better way of quantifying the uncertainties.
Results. When applied to a set of solar ﬂare visibility amplitudes recorded by STIX on November 18, 2020, the two parametric methods provide very coherent results. The analysis also demonstrates the ability of STIX to reconstruct data at a high time resolution and, from a spectral viewpoint, it shows the reliability of a double-source scenario that is consistent with a thermal versus nonthermal interpretation.
Conclusions. In this preliminary analysis of STIX imaging based only on visibility amplitudes, we formulate the imaging problem as a non-linear parametric issue addressed by means of two high-performance optimization techniques that both show the ability to sample the parametric space in an eﬀective fashion, thus avoiding any local minima.},
	language = {en},
	urldate = {2022-07-12},
	journal = {Astronomy \& Astrophysics},
	author = {Massa, Paolo and Perracchione, Emma and Garbarino, Sara and Battaglia, Andrea F. and Benvenuto, Federico and Piana, Michele and Hurford, Gordon and Krucker, Säm},
	month = dec,
	year = {2021},
	pages = {A25},
}

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