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XRT Analysis Software

XRT Analysis Software. R. Kano (NAOJ) and XRT Teams. Analysis Guide. XRT Analysis Guide (XAG) is distributed in SSW as $SSW/hinode/xrt/docs/XAG.pdf . In the guide, …. For data analysis problems, contact xrt_manager[at]cfa.harvard.edu

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XRT Analysis Software

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  1. XRT Analysis Software R. Kano (NAOJ) and XRT Teams Hinode Workshop in China

  2. Analysis Guide • XRT Analysis Guide (XAG) is distributed in SSW as $SSW/hinode/xrt/docs/XAG.pdf. • In the guide, …. • For data analysis problems, contact xrt_manager[at]cfa.harvard.edu • For science discussions, contact xrt_science[at]cfa.harvard.edu Hinode Workshop in China

  3. Outline of XRT Analysis • Get Level-0 data • Download Level-0 data from DARTS or other mirror sites. • Define XRT FITS files (Level-0 data). • Read file(s) • Create Level-1 data(= Calibration) • Calibration… • Only for morphological studies, if necessary, touch-up the contamination spots. • Create Level-2 data • For example, to calculate temperature and emission measure Morphological studies are available. Studies of spatial and temporal variation are available. Studies of energetics are available. Hinode Workshop in China

  4. Get Level-0 data. • Download Level-0 data from DARTS or other mirror sites. • Downloaded FITS files are named asXRTYYYYMMDD_hhmmss.s.fits,and stored in the directory ofYYYY/MM/DD/Hhh00. • Define XRT FITS files (Level-0 data). • Set the name of directory where the downloaded FITS files are stored asdir_name, then • file=file_search(dir_name, '*.fits') • Read file(s) • read_xrt, file, index0, data0which is identical withmreadfits, file, index0, data0. • The unit of data0 is DN (data number), which corresponds to about 57 electrons. Hinode Workshop in China

  5. Hinode Workshop in China

  6. Hinode Workshop in China

  7. Selection of Images FW1 • Important parameters inindex • index.date_obs : Start time of exposure. • index.exptime: Exposure duration in sec. • index.ec_fw1_: Filter name in FW1. • index.ec_fw2_: Filter name in FW2. • index.chip_sum : Spatial resolution in CCD pixel. • index.rsize_col: Horizontal size in CCD pixel. • index.rsize_row : Vertical size in CCD pixel. • Example to select Ti/poly. images. • mreadfits, file, index • ss = where( (index.ec_fw1_ eq ‘Open’) and (index.ec_fw2_ eq ‘Ti_poly’) ) • mreadfits, file(ss), index0, data0 FW2 Hinode Workshop in China

  8. Create Level-1 data: Calibration • Calibration • xrt_prep, index0, data0, index1, data1 • Data base ( or detailed model ) of dark images will be distributed through SSWDB in near future. • For CCD-bias and dark subtraction & exposure normalization, it is almost the same with the following equations, if you havedark_imagewith the same exposure duration. data1 = ( data0 – dark_image ) / index0.exptime • XRT images’ alignment • xrt_jitter, index, off • data_output = image_translate( data_input, off ) Hinode Workshop in China

  9. To Download of Dark Images • Recently we take dark images during observations at a low cadence (10min-a few hours) with the same FOV format. • At this point, for better quantitative analysis, it is better to use dark images with the same FOV format taken during the observation. • Caution: • Exposure duration of dark images shown by index.exptime is meaningless, because no shutter motion. • Accumulation duration shown by index.exccdex indicate the length of dark “exposure”. Hinode Workshop in China

  10. Hinode Workshop in China

  11. Hinode Workshop in China

  12. Hinode Workshop in China

  13. Create Level-1 data • Only for morphological studies, if necessary, touch-up the contamination spots. • xrt_tup_contam,index0,data0,index1,data1 Hinode Workshop in China

  14. Create Level-2 data:Example of Filter-Ratio Method. image taken with one filter • Filter-Ratio Method • xrt_teem, index1[0], data1[*,*,0] , index1[1], data1[*,*,1] , te, em, te_err, em_err • ne = 0.5 em – 0.5 alog10(V) , where V(cm3) is the volume of the observing plasma. image taken with the other filter logNe(cm-3) errors in log scale logT(K) logVEM(cm-5) It will be installed into SSW soon. Hinode Workshop in China Narukage et al. 2008 (TBD).

  15. Create Level-2 data:Caluculate XRT response • Effective Area • ea = xrt_eff_area( lambda ) • The Chianti package is SSW is also useful to understand the XRT response. • Temperature Response • t_resp = xrt_flux( te, FW1_ID, FW2_ID, /DN) • Filter-Ratio Model Function • ratio = t_resp0 / t_resp1 It will be installed into SSW soon. Hinode Workshop in China Narukage et al. 2008 (TBD).

  16. Summary • XRT software and database are distributed as SSW and SSWDB, although more progress of them is necessary. • XRT Analysis Guide (XAG) is distributed in SSW as $SSW/hinode/xrt/docs/XAG.pdf. • The programs related with the filter-ratio method will be distributed, just after we finish the on-orbit re-calibration of XRT. • The results of on-orbit re-calibration will be submitted as “Narukage et al. 2008, Solar Physics”. Hinode Workshop in China

  17. Finally • We would like to share to develop better software. • When you create any useful programs, please let us know. Hinode Workshop in China

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