Despite our current best effort of correction, the above plots have serious problems, which need to be further corrected.
Fig. 7 from Narukage etal 2011 | Fig.37 from Narukage etal (2011) |
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Monthly frequency | Monthly exposure time |
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factor relative to the last value of curent DB | converted to the thickness |
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Derived Te, EM and irradiance (5-60A)
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Possibility 1: It is possible that entrance filter holes cause higher apparent visible light open area than X-ray open area, because of differences in how white light and X-rays scatter in the telescope.However, we should apply the stray light correction to some extent , otherwise results in unrealistic EM variation (the lowest values in 2017 are lower than those during the solar minimum, 2019-2020, as shown in the above left plot).
(a comment from Engineering team, via K. Reeves on 29-Sep-2021)
[Follow-up of the 6-Oct meeting]
Variation of the full-Sun signals(DNs) with different filters :
Al_mesh singals are prone to attenuate by contamination
(after 2017).
* Al_mesh, Ti_poly and Al_poly plots were made from the
current irradiance study.
* Thin_Be signals were measured by my 2021 REU student, Stefanie Davis.
* Al_poly data points (2008-2015) can be increased by additional work.
Al_mesh | Ti_poly |
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Al_poly | Thin_Be |
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phase 0: ofrac(i)=0 phase 1: ofrac(i)=0.001 --> 0 phase 2: ofrac(i)=0.033 --> 0.033*0.50 phase 3: ofrac(i)=0.075 --> 0.075*0.70 phase 4: ofrac(i)=0.099 --> 0.099*0.80
factor relative to the last value of curent DB | converted to the thickness |
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Fig. IrTeEM_3 |
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2008 (phase 0) | 2011 (phase 0) | 2014 (phase 1) |
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Calc. with Chianti ver.9 Te and EM | Calc. with Chianti ver.9 Te and EM | Calc. with Chianti ver.9 Te and EM |
An attempt to get the
mission-long Al_poly/Al_mesh equivalent Te and EM .
Fig. IrTeEM_4 |
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get highest Te but EM too low (ver. b) | get low Te and highest EM (ver. a) |
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Fig. IrTeEM_5b | Fig. IrTeEM_5a |
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Both versions (a and b) turned out not favorable for the idea of "Al_poly/Al_mesh equivalent irradiance". But ver.(a) gives the same level of Te, EM, and irradiance for the past two minimum periods (around 2008 and around 2019), so a good candiate of our final irradiance products.