New HXT Image Synthesis Program



                                                                May, 1998

Dear colleagues,

We would like to announce that a new set of HXT modulation pattern parameters, 
together with an improved HXT image synthesis program with the Maximum Entropy 
Method (MEM), are now available and are open for Yohkoh data users. 

The new parameters have been established via on-board calibration of HXT by 
Dr. Jun Sato as part of his Ph.D. thesis study. During the course of this 
calibration, significant improvement of the MEM image synthesis program has 
also been achieved. The combination of the parameters and program enables us 
to obtain HXT images with considerably higher image quality than those with 
the previous ones. Details of the calibration and the resultant improvement 
of HXT images will soon be reported in a journal paper.

The new modulation pattern parameters and the program are now on-line at 
ISAS workstations. They should also be on-line at your own institute soon, 
provided that your institute regularly copies Yohkoh software package from 
ISAS. In case you may want to use the new HXT program before it is copied 
from ISAS, we have prepared a `tar-ed'-then-`gzip-ped' file nmovie.tar.gz. 

The file is located in a Web page:

http://solar.nro.nao.ac.jp/~hxthome/newtool/

Please note that at this moment, the program can only be run on SUN 
workstations. Platform-independent IDL version of the program, which is most 
likely HXT_MULTIMG, will be available soon. Dr. J. McTiernan of UCB has kindly 
agreed to take part in preparing the IDL version. 

The tar file nmovie.tar.gz contains a total of 14 files which are classified 
into the following three categories:

(1) HXT image synthesis program; executable binary (SUN only) and the Fortran 
        source code.
(2) HXT modulation pattern parameters.
(3) A set of IDL programs for extracting HXT count data for image synthesis 
        and displaying the resultant images (i.e., serve as user interface).

The files contained in nmovie.tar.gz is listed in the table below. We 
recommend that the extracted files be located in the directories shown in the 
table. After placing the files to appropriate directories and running the 
YODAT program to extract HXT count data from HDA files, the following IDL 
command 

IDL> .run HXTPRO_NMP

will provide an HXT image with the new set of modulation patterns. 


-----------------------------------------------------------------------------
File Name               Description                     Suggested directory
-----------------------------------------------------------------------------
(1)
nmovie_s                SUN-executable binary           $DIR_HXT_EXE
nmovie.f                Fortran source code             $ys/ucon/idl/sato
-----------------------------------------------------------------------------
(2)
npara.dat               Modulation pattern params.      $DIR_HXT_CAL
-----------------------------------------------------------------------------
(3)
hxtpro_nmp.pro          IDL program                     $ys/ucon/idl/sakao
wrt_hxtmve_jcl3.pro     IDL program                     $ys/ucon/idl/sato

cnv_hdrstr.pro          IDL program                     $ys/ucon/idl/sakao
cnv_infstr.pro          IDL program                     $ys/ucon/idl/sakao
make_timstr.pro         IDL program                     $ys/ucon/idl/sakao
disp_hxtimg.pro         IDL program                     $ys/ucon/idl/sakao
plot_cinema_hdr.pro     IDL program                     $ys/ucon/idl/sakao
plot_cinema2.pro        IDL program                     $ys/ucon/idl/sakao
hxt_hs_task.pro         IDL program                     $ys/ucon/idl/sakao
hxt_hs_data.pro         IDL program                     $ys/ucon/idl/sakao

fort2hxi.pro            IDL program                     $ys/hxt/idl/atest
-----------------------------------------------------------------------------


Any questions and/or comments are welcome. They should be addressed to:

sato@nro.nao.ac.jp

with CC's to kosugi@laputa.mtk.nao.ac.jp and sakao@spot.mtk.nao.ac.jp. 

We hope that the release of the new HXT image synthesis software package will 
encourage further analyses on HXT data and, at the same time, increase the 
number of HXT data users. 


With best regards,

Jun Sato, Takeo Kosugi, and Taro Sakao

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