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   Time coverage of the data

The following table provides an overview of the data sets of SACS, with the time period covered by the data sets, as well as the data sets planned for use in the (near) future, listed per satellite instrument. The date between brackets in the off-line data archive column is the date of the first available data.

instrument
    data products
near-real-time processing off-line data archive
[start = first data day]
nrt data archive operational
SCIAMACHY
    SO2 column
    Aerosol index
 
Jan 2004 - Apr 2012
Jan 2009 - Apr 2012
 
Sep 2006
Jul 2010
 
Jan 2004 - Apr 2012
Jan 2009 - Apr 2012
[start:  02 Aug. 2002]
OMI
    SO2 column
    Aerosol index
 
Aug 2004 - Aug 2017
Jul 2009 - Aug 2017
 
Jul 2009
Jul 2009
 
Aug 2004 - Aug 2017
Jul 2009 - Aug 2017
[start:  17 Aug. 2004]
GOME-2
    SO2 column
    Aerosol index
 
Jan 2007 - Aug 2017
Jun 2010 - Aug 2017
 
Feb 2008
Jun 2010
 
Jan 2007 - Aug 2017
Jun 2010 - Aug 2017
[start:  04 Jan. 2007]
IASI
    SO2 dbt
    Aerosol/Ash flag
 
Oct 2007 - Aug 2017
Oct 2007 - Aug 2017
 
Aug 2010
        --
 
Oct 2007 - Aug 2017
Oct 2007 - Aug 2017
[start: 2007]
AIRS
    SO2 dbt
    Aerosol/Ash flag
 
Sep 2002 - Aug 2017
Sep 2002 - Aug 2017
 
Sep 2010
        --
 
Sep 2002 - Aug 2017
Sep 2002 - Aug 2017
[start: 2007]

Remarks: an entry "--" means that that data set is not yet available
 

  Missing data in the SO2 off-line data archive

The satellites carrying the instruments perform 14 or 15 orbits per day. It happens that for one or
more of these orbits data is missing, either because the instrument did not measure anything, or
because the measurement is of too low quality for a reliable retrieval. This missing data leads to
gaps in the plots of the daily data. For some geographic regions the web pages accessing the
data archive will then show empty pictures.

There are also days with no data at all, again because of lack of measurements of lack of
the quality of these measurements. For these days there will be no data in the archive at all,
and the web pages accessing the data archive will show a message.

The following tables lists whole days without any SO2 and AAI data in the off-line data archive,
i.e. for which no maps are shown. The first day for which off-line archive data is available is given above.
Note that this table is maintained by hand and may thus be incomplete.

Year SCIAMACHY OMI GOME-2 IASI
Month Days Month Days Month Days Month Days
2010 March
Feb.
Jan.
04
01-02
29-31
May
Jan.
02
19
[none] [none] -- --
2009 Aug.
June
April
March
Jan.
10
04,16
07,08
31
01-03
Aug. 05 Dec.
Nov.
Sep.
April.
13-15
29
08-10
06-08
17-19
-- --
2008 Dec. 19-31 [n/a] [n/a] Nov.
Sep.
Aug.
Feb.
Jan.
29
08-11
15
17
28
-- --
2007 Dec.
Sep.
02-04
25-27
[n/a] [n/a] Sep.
April

March
Jan.
19
09,
21-25
03-05
01-03
-- --
2006 Dec.
Nov.
Sep.
May
April

Jan.
13-15
29
08-10
26
06-08,
17-19
14
[n/a] [n/a] [n/a] [n/a] [n/a] [n/a]
2005 May
Jan.
12
01-02
[n/a] [n/a] [n/a] [n/a] [n/a] [n/a]
2004 Dec.
Nov.
Oct.
Sep.
June
May
Jan.
20-31
17
01
23
18-28
09
01-03
[n/a] [n/a] [n/a] [n/a] [n/a] [n/a]
 
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