Introduction
SOT/SP observations usually consist of many exposures with varying slit
positions, forming 2-D scans of solar features. But each SOT/SP level 0 fits
file stems from just a single exposure (or an average of a few exposures). As
a result, most SOT/SP level 0 fits files are utterly uninteresting in and of
themselves.
SOT/SP level 1D
SOT/SP level
1D, however, combines the exposures (after conversion to calibrated level 1
files) into more useful images. We have generated level 1D images whenever
possible, using the standard
sp_prep solarsoft
routines. The images are, however, only available under the
first of the level 0 files that contribute to a level 1D
image, which we term the "level 1 lead" file.
In order to identify the level 1 lead files, we have added a SOT/SP specific
column to the database, called SS__L1LEAD. The value in
this column is either "y" (for lead files) or "n" (for all the others). Since
"browsing" the non-lead files is not very useful, we have added SS__L1LEAD=y as a standard criterion on the input page ("show
level 1 leads only"), with the option of changing it to "show all level 0 files".
Image product selection
Since the level 1D products are somewhat numerous, we have also added a
mechanism to select which ones are displayed as thumbnails on the result
pages. This selection menu and the criterion for
SS__L1LEAD can be found in the "SOT/SP level 1/1D options"
box.
Retrieval etc
At the moment, we offer the level 1D products only as an aid to select
"interesting" observations for further analysis. You will therefore have to
download level 0 files and process them with
sp_prep
locally. For this reason, the
SS__L1LEAD criterion is
always
ignored by the file retrieval routine. As a result,
you may notice that the number of files selected for retrieval can be many
times higher than the number of level 1 lead files/groups you have selected.
|
|
Problems, questions, suggestions and comments to: prits-group@astro.uio.no
This webpage uses cookies to store information about your
searches.
|
