XRT analysis guide
Please check the official
XRT analysis guide for full details about XRT analysis. This
document just contains some notes that are useful to me.
In order to use the XRT catalog to find data, it's necessary to install the XRT branch of SSWDB. However, this directory contains a sub-directory called 'l1q_synop' that is very large (> 10 GB!), so I've set up my installation to only install the following sub-directories:
For the XRT routines to find data on your computer, you need to use the environment variable $XRT_ARCHIVE.
For the routine 'xrt_jitter' to work, it's necessary to have
SSWDB directory 'hinode/gen'.
This is accessed by doing:
IDL> xrt_cat, t0, t1, catx, ofiles
for a suitable time range [t0,t1]. The catalog is stored in 'catx', which is a structure array. Each element of 'catx' corresponds to a XRT file, and the optional output 'ofiles' contains the full path specification of the files, assuming they're available on your computer.
The XRT team don't seem to provide any way of filtering the catalog into different filter and data types, so I've written a routine called 'xrt_cat_summary' that does this:
IDL> xrt_cat_summary, catx
This prints information about all the 'normal' files (i.e., not dark frames) in 'catx', and then prints a summary of the different types of unique file in 'catx'. With this information you can then produce a list of files belonging to a particular type:
IDL> xrt_cat_summary, catx, ofiles, type=type, outfiles=outfiles
where 'type' is an integer corresponding to the summary information, and 'outfiles' contains the list of files belonging to the specified type. The files can then be read with read_xrt:
IDL> read_xrt, outfiles, index, data
XRT temperature response functions
The following commands generate temperature response functions
for XRT for a specific time.
'xrt_temp_resp' is an IDL structure containing the responses for all the filters. For example, if you want Al-poly, then do:
IDL> print, xrt_temp_resp.name
Note that the XRT analysis guide seems to recommend /apec_default, but /chianti_default is also available.
Page maintained by Dr Peter R Young.