###################################################### Comparison of G-band full-Sun VLS=Open/Close images ------------------------------------------------------ 18-Sep-2020 : Aki Takeda (initial version) 25-Oct-2020 : modify phase 3 and 4 values. 10-nov-2020 : modify phase 1 to 4 values. ###################################################### [quick result] ******************************************** * open_ratio(@phase1) = 0.00162 (~0.1%) * * open_ratio(@phase2) = 0.0325 (~3.3%) * * open_ratio(@phase3) = 0.0747 (~7.5%) * * open_ratio(@phase4) = 0.0993 (~9.9%) * ******************************************** These values are used in GET_PF_OPENFRAC.PRO [derivation] VLS: Visible Light Shutter (a) Open/G-band, 2048x2048, VLS=Open : G-band full-Sun + stray light component (b) Open/G-band, 2048x2048, VLS=Close: stray light component ***** phase 0 (before pre-filter failures) ***** [gband_20120430.pro] --- full-FOV intensity --- (a) 30-APR-2012 18:24:47 --- 5.61570e+10 (DN/sec) ***** phase 1 (after the 1st pre-filter failure) ***** [gband_20130511.pro] --- full-FOV total intensities --- (a) 11-MAY-2013 18:01:51 --- 1.04302e+11 (b) 11-MAY-2013 18:01:57 --- 4.70350e+10 (a)-(b): G-band full-Sun --- 5.72622e+10 ***** phase 2 (after the 2nd pre-filter failure) ***** [gband_20150622.pro] --- full-FOV total intensities --- (a) 22-JUN-2015 18:04:35 --- 1.15551e+12 (b) 22-JUN-2015 18:05:19 --- 1.09732e+12 (a)-(b): G-band full-Sun --- 5.81910e+10 ***** phase 3 (after the 3rd pre-filter failure) ***** [gband_20170621.pro] --- full-FOV total intensities --- (a) 21-JUN-2017 18:08:24 --- 2.64228e+12 (b) 21-JUN-2017 18:08:33 --- 2.62414e+12 (a)-(b): G-band full-Sun --- 1.81380e+10 <--- big error! ***** phase 4 (after the 4th pre-filter failure) ***** [gband_20200507.pro] --- full-FOV total intensities --- (a) 7-MAY-2020 18:05:20 --- 3.65183e+12 (b) 7-MAY-2020 18:05:29 --- 3.64950e+12 (a)-(b): G-band full-Sun --- 2.33230e+09 <--- big error! [gband_allphases.pro] --- full-FOV total intensities --- (b) 3-JUL-2012 17:56:31 --- 3.10814e+10 *** early phase 1 *** (b) 11-MAY-2013 18:01:57 --- 4.70350e+10 *** mid phase 1 *** (b) 22-JUN-2015 18:05:19 --- 1.09732e+12 *** phase 2 *** (prev.x 23.3) (b) 21-JUN-2017 18:08:33 --- 2.62414e+12 *** phase 3 *** (prev.x 2.4) (b) 7-MAY-2020 18:05:29 --- 3.64950e+12 *** phase 4 *** (prev.x 1.4) ***** estimation of G-band full-Sun intensity ***** [via Visible Light system (G-band telescope) VLS=OP] I_sun * (25mm*25mm*!pi) * 0.00020 * 0.4932 = 5.726e10 (* conv.factor I/DN) --[eq.1] here 25*25*!pi : G-band telescope apature = 1962.5 (mm^2) 0.00020 : G-band optical system averaged transmission (changed from peak value) 0.4932 : G-band filter peak transmission 5.726e10 : G-band full-Sun intensity at phase 1 [via X-Ray system (X-Ray telescope) VLS=CL] I_sun * 228mm^2 * open_ratio * 0.4932 = 4.703e10 (* conv.factor) --[eq.2] here 228mm^2 : effective area of X-ray system open ratio : open ration of pre-filter 0.4932 : G-band filter peak transmission 4.703e10: G-band stray light intensity at phase 1 from the ratio of [eq.1] to [eq.2] open_ratio = [4.703e10 * 0.00020 * 1963.5] / [228 * 5.726e10] = 0.00141 (~0.1%) this corresponds to the open area of 0.32 mm^2 = ~(0.56mm)^2 -- size of the hole ***** do the same thing for the phase 2 data ***** open_ratio = [1.097e12 * 0.00020 * 1963.5] / [228 * 5.819e10] = 0.0325 (~3.3%) ***** phase 3 and 4 ***** - can't use the same method bacause of the big error of G-band int. - use results of G-band intensity analysis for CCD contamination DB (by K. Yoshimura): G-band intensity ratio [phase3/phase2] = 2.3 G-band intensity ratio [phase4/phase3] = 1.33 open_ratio(@phase3) = 0.0325 * 2.3 = 0.0747 (~7.5%) open_ratio(@phase4) = 0.0325 * 2.3 * 1.33 = 0.0993 (~9.9%) % % [OLD VERSION 2] full_FOV_int_20201025.txt % [OLD VERSION 1] % ***** phase 3 and 4 ***** % - can't use the same method bacause of the big error of G-band int. % - simply multiply the stray light intensity ratio relative to the phase 2. % open_ratio(@phase3) = [2.624e12 * 0.0419] / [1.097e12] = 0.100 (~10%) % open_ratio(@phase4) = [3.649e12 * 0.0419] / [1.097e12] = 0.139 (~14%) %