Data products and their time coverage

The Service gathers SO₂ data possibly related to volcano eruptions from measurements by a variety of satellite instruments and provides these in near-real time. In case of an "SO₂ event" with exceptional SO₂ concentrations, the Service issues a notification by email to users who have subscribed to this service. In addition, a data archive is made for case studies and validation of the notification criteria. Apart from SO₂, the Service will also provide an aerosol flag or aerosol index.

Detailed description of the SACS data products is given on this link

The 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.

• SCIAMACHY:
  • SO₂ vertical column data (VCD)
     +  cloud cover fraction (CCF)
  • Absorbing aerosol index (AAI)
  
  
• GOME-2:
  • SO₂ vertical column data (VCD)
     +  cloud cover fraction (CCF)
  • Absorbing aerosol index (AAI)
  
  
• OMI:
  • SO₂ vertical column data (VCD)
     +  cloud cover fraction (CCF)
  • Absorbing aerosol index (AAI)
  
  
• IASI:
  • SO₂ brightness temperature difference index data (DBT) and column (VCD)
  • Ash index
  
  
• AIRS:
  • SO₂ brightness temperature difference index data (DBT) and column (VCD)
  • Ash index

instrument     data products	near-real-time processing
	data availability	operational since
SCIAMACHY     SO2 column     Aerosol index	Jan 2004 - Apr 2012 Jan 2009 - Apr 2012 [start:  02 Aug. 2002]	Sep 2006 Jul 2010
OMI     SO2 column     Aerosol index	Aug 2004 - Dec 2024 Jul 2009 - Dec 2024 [start:  17 Aug. 2004]	Jul 2009 Jul 2009
GOME-2     SO2 column     Aerosol index	Jan 2007 - Dec 2024 Jun 2010 - Dec 2024 [start:  04 Jan. 2007]	Feb 2008 Jun 2010
IASI     SO2 dbt     Aerosol/Ash flag	Oct 2007 - Dec 2024 Oct 2007 - Dec 2024 [start: 04 Jan. 2007]	Aug 2010 Jan 2011
AIRS     SO2 dbt     Aerosol/Ash flag	Sep 2002 - Dec 2024 Sep 2002 - Dec 2024 [start: 2007]	Sep 2010 Mar 2013