Transcript presentation

SPIRIT – database
and data access
Andrey A. Perzov, Sergey V. Kuzin, Sergey
A. Bogachev, Vladimir A. Slemzin, Sergey V.
Shestov, Oleg I. Bugaenko
SPIRIT data types
SPIRIT is a space4 channels
complex of telescopes
that works at the Earth orbit from August
2001 and includes the following
instruments …
TELESCOPE 1
4 channels
TELESCOPE 2
2 channels
IMAGING SPECTROGELIOGRAPH
Mg XII 8.42 A
2 channels
XUV SPECTROGELIOGRAPH
2 channels
TELESCOPE 1
171 A channel
195 A channel
284 A channel
304 A channel
TOTAL: ~ 14 000 images during 4.5 years (12 Gb)
TELESCOPE 2
175 A channel
304 A channel
TOTAL: ~ 81 000 images during 4.5 years (50 Gb)
IMAGING
SPECTROGELIOGRAPH
Mg XII 8.42 A
TOTAL: ~ 191 000 images during 4.5 years (200 Gb)
XUV
SPECTROGELIOGRAPH
177-207 A
285-335 A
TOTAL: ~ 9 000 images during 4.5 years (10 Gb)
TOTAL NUMBER OF THE SPIRIT IMAGES
TELESCOPE 1
171 A
2 800 195 A
4 500
284 A
3 500 304 A
3 100
TELESCOPE 2
175 A
40 500 304 A
40 500
IMAGING SPECTROGELIOGRAPH Mg XII
Mg 1
87 500 Mg 2
104 000
XUV SPECTROGELIOGRAPH
XUV 190
3 400 XUV 304
5 000
TOTAL: 295 000 images of the Sun
during 4.5 years of work
Full cycle of SPIRIT data
processing
1. On-board registration and processing
3. Converting data to FITS and filling the
database
2. Data analysis and improvement
On-board processing
Data analysis and
improvement
Automatic software:
– Lost data filling
– Flat field correction
User software:
– Background
subtraction
– Finding of
coordinates
Full package of SPIRIT software will be available
in SSW from January-February 2006
Lost data recovering
Methods of the lost
pixel reconstruction:
a) Comparison with the
same pixels in the
adjacent images
b) bilinear interpolation
from the adjacent
rows
Recovering of the places
with filter damage
Method of the
reconstruction (3 steps):
1. We synthesize the mask of
damage (one mask for one
SPIRIT channel)
2. We multiply the data matrix
by this mask of damage
3. Places of most strong
damage are reconstructed by
the bilinear interpolation as
the lost pixels
Flat field correction
Flat field mask
Methods of the mask calculation
a) Averaging of the long series of one channel images
b) Method of Kuhn-Lin-Loranz (PASP, 1991, V. 103, P. 1097)
Background subtraction
F1
F2
F3
F20
…
20
Background  a0   ai F
i 1
Background subtraction
Orientation problem
and its solving
Description of the problem
– Axe of the satellite varies
slowly in time that leads to
some uncertainty in the
position of the Sun disk in the
image
– For correct analysis of the
data, it is necessary to
compensate this shifting with
the precision of about 1 pixel
Orientation problem
and its solving
Method
We find the position of the
Sun disk in the image with
our own method based on
the successive approaches
to the Sun limb
Result (in CCD pixels)
Итерация 2
1
3
X=253.5
Y=301.2
R=182.5
An example of SPIRIT data
after the finishing of full
processing cycle
Converting the data to FITS
format
Header of the SPIRIT fits files consists of the two main parts
The upper part coincides with the SOHO/EIT header.
It allows to directly apply all the EIT programs for
processing of the SPIRIT fits files.
The lower part includes an additional information on the
SPIRIT data. This information is necessary for more
detail processing – for example, for decision of ballistic tasks.
Upper part of the header
coincides with the SOHO/EIT
SPIRIT HEADER
SOHO/EIT HEADER
Lower part of the header
(provides additional information on the
SPIRIT data)
Ballistic information
Structure of
the SPIRIT data base
Request
SQL Database
Management System
HTML
SPIRIT home page
Access
through web site
Request
FTP base
of images
Direct FTP access
SPIRIT FTP server
Address: ftp://serv99.lebedev.ru/data
Login:
xrasuser
Password: userxras
Now are acceptable through FTP:
• Telescope 1
4 channels, all the images, free access
• Telescope 2
2 channels, all the images, free access
• XUV-Spectrogeliograph
2 channels, all the images, free access
SPIRIT web page
Address:
http://spirit.xras.lebedev.ru/
FTP access through
web page
Address:
http://spirit.xras.lebedev.ru/data-access-ftp.html
Access through SQL
based data search system
Address:
http://spirit.xras.lebedev.ru/data-access.php