CLEAN and multiscale CLEAN for STIX in Solar Orbiter

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Table 2.

Imaging parameters characterizing the ground truth, CLEAN, multiscale CLEAN, MEM_GE, uv_smooth_VSK, and u-CLEAN reconstructions for two approaching circular Gaussian sources (see Fig. 3).

		First source					Second source

	Total flux	max	x_max	y_max	FWHM_x	FWHM_y	max	x_max	y_max	FWHM_x	FWHM_y
ground truth	10000	11.07	−41	39	20	20	5.18	39	−41	30	30
CLEAN	12888	6.81	−38	41	24	27	4.41	35	−43	33	35
multi-scale CLEAN	9641	7.59	−39	42	24	24	4.92	39	−45	27	26
MEM_GE	9709	9.52	−39	41	18	14	3.91	39	−45	35	21
uv_smooth_VSK	12958	12.80	−39	42	22	21	10.04	35	−42	24	23
u-CLEAN	10795	12.69	−37	41	21	21	7.49	33	−41	28	23

ground truth	10000	11.17	−12	11	20	20	4.91	11	−12	30	30
CLEAN	11650	6.85	−11	11	29	23	4.22	10	−12	41	24
multi-scale CLEAN	10101	8.68	−11	10	25	23	4.68	11	−14	28	25
MEM_GE	10103	9.05	−12	11	18	18	3.61	9	−12	31	25
uv_smooth_VSK	10337	8.42	−12	11	27	27	4.28	9	−13	40	20
u-CLEAN	10513	10.95	−12	13	23	21	5.97	11	−13	28	21

ground truth	10000	11.45	−11	9	20	20	4.95	9	−10	30	30
CLEAN	11439	7.13	−9	8	30	26	4.55	6	−7	43	16
multi-scale CLEAN	10037	9.43	−9	7	25	25	4.69	6	−8	42	17
MEM_GE	10119	9.38	−10	9	19	19	3.97	6	−7	36	16
uv_smooth_VSK	10275	9.22	−10	9	28	27	4.59	8	−7	40	15
u-CLEAN	10499	10.93	−10	10	24	22	5.42	10	−13	29	16

Notes. The total flux is conceived in counts s⁻¹ cm⁻² keV⁻¹, max is expressed in counts s⁻¹ cm⁻² keV⁻¹ arcsec⁻², and x_max, y_max, FWHM_x, FWHM_y are conceived in arcsec.

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