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A Proposal of Standard Observations: AR, Flare, and PreFlare

A Proposal of Standard Observations: AR, Flare, and PreFlare. R. Kano (NAOJ). Concept of Standard Obs. Active Region (AR) Take 2(or 3)-filter images with 3 different FOVs ( Core , Border and Environment ) all day.

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A Proposal of Standard Observations: AR, Flare, and PreFlare

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  1. A Proposal of Standard Observations:AR, Flare, and PreFlare R. Kano (NAOJ) XRT Team Meeting

  2. Concept of Standard Obs. • Active Region (AR) • Take 2(or 3)-filter images with 3 different FOVs (Core, Border and Environment) all day. • It is because events in active regions often affect (or are affected by) their environments. • This plan does not cover detail studies for multi-thermal (or DEM) structures. Special observations or collaborations with EIS will be needed for them. • Take AR Core with the ~1 min cadence. • Because sound waves (~240km/s) take 5 min to travel along a loop (~100” = 73Mm), we can catch 5 phases of motions with sound speed in a loop. • AR with PreFlare observation • The same observation, but with a rapid cadence for Core- and Border-FOVs by using preflare buffers. • Flare (FL) • The same set of FOVs, but with a rapid cadence and thicker filters. XRT Team Meeting

  3. A Baseline Plan for Standard AR Observation (Images were taken in a dry run in May. ) • Core • FOV: 384”x384” • Res.: 1”x1” • Filter: G2 & G3 • Exp.: AEC3 (no sat.) • Cadence: 1 set / 1 min • Environment • FOV: 1024”x1024” • Res.: 4”x4” • Filter: G1 & G2 • Exp.: AEC2 (small sat.) • Cadence: 1 set / 2 min • Border • FOV: 768”x768” • Res.: 2”x2” • Filter: G1, G2 & G3 • Exp.: AEC2 (small sat.) • Cadence: 1 set / 2 min The 1st dry run on May 23 revealed that we should reduce the data rate for continuous observations. XRT Team Meeting

  4. 1024”x1024” 384”x384” Composite Image of 3 FOVs taken with Ti/poly. in the test on May 23(see Appendix-1) XRT Team Meeting

  5. Filter Groups • We classified the X-ray filters into 5 groups in this PPT, to simplify the proposal. thinner thicker • G1 • Al/mesh • G2 • Ti/poly. • C/poly. • Al/poly. • G3 • thin Be • G4 • med Al • med Be • G5 • thick Al • thick Be AR Core AR Border FL Core AR Env. FL Border FL Env. XRT Team Meeting

  6. What is different from AR Obs? • Flare Observation • Core • FOV: 384”x384”=ROI-15 • Res.: 1”x1” • Filter: G2 & G3 • Exp.: AEC3 (no sat.) • Cadence: 1 set / 1 min • Environment • FOV: 1024”x1024” • Res.: 4”x4” • Filter: G1 & G2 • Exp.: AEC2 (small sat.) • Cadence: 1 set / 2 min • Border • FOV: 768”x768”=ROI-16 • Res.: 2”x2” • Filter: G1, G2 & G3 • Exp.: AEC2 (small sat.) • Cadence: 1 set / 2 min 1 min 30sec 1 min G4 & G5 G2, G3 & G4 • AR with PreFlare Observation • Core • FOV: 384”x384” • Res.: 1”x1” • Filter: G2 & G3 • Exp.: AEC3 (no sat.) • Cadence: 1 set / 1 min • Environment • FOV: 1024”x1024” • Res.: 4”x4” • Filter: G1 & G2 • Exp.: AEC2 (small sat.) • Cadence: 1 set / 2 min • Border • FOV: 768”x768”=ROI-5 • Res.: 2”x2” • Filter: G1, G2 & G3 • Exp.: AEC2 (small sat.) • Cadence: 1 set / 2 min 30sec 1 min XRT Team Meeting

  7. Different colors mean different filters. Schematic View of Time Cadences QT mode FL mode From AR obs. to FL obs. ~ 1 min ~ 30 sec Core Border Env. time QT mode FL mode From AR+PreFlare obs. to FL obs. ~ 30 sec ~ 30 sec Core Border Env. time Stored in Preflare Buffers Overwritten in Preflare Buffers XRT Team Meeting

  8. Estimated Data Rate • Based on the dry-run test using JPEG Q95 (see Appendix-2),the data rate of the baseline AR obs. is estimated to3,057 Mbits/day.It is much larger than the recent DR volume allocated to XRT (800~900 Mbits/day). • We would like to keep the concept. But, some modifications are necessary. For examples: • Reduce the cadence from 1min to 2min for Core,and from 2 min to 12min for Border & Env.  867Mbits/day • Reduce the FOV size to 256”x256” but keep the 1min cadence for Core. Reduce the cadence to 10min for Border & Env. 873Mbits/day • Reduce the JPEG-Q from 95 to 85 for Core and to 92 for Border & Env. For Border & Env., reduce the cadence to 5min also (see Appendix-3). 875Mbits/day XRT Team Meeting

  9. Appendix-1: Test Programs for AR(#16B4) & FL(#16B5) G-band & Darks AR Core AR Border AR Env. G-band FL Core FL Border XRT Team Meeting FL Env.

  10. Appendix-2: Compression Rate median values derived in the test AR observation on May 23. • The data rate of the baseline AR obs. was estimated based on this compression rate and the parameters on slide 4. JPEG(Q=95) was used for all X-ray images. XRT Team Meeting

  11. Appendix-3: Smaller Q-values were tested on June 13. It looks okey. Core: Q95 Core: Q85 Border: Q95 Border: Q92 Env.: Q95 Env.: Q92 XRT Team Meeting

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