Indices

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SET now produces an improved version of the JB2008 solar indices (SOLFSMY.TXT.zip) and geomagnetic storm indices (DTCFILE.TXT.zip) which are updated daily.

To run the JB2008 model you will need both the solar and storm indices from the two downloadable files above. The storm indices are generated from hourly Dst values during moderate to high geomagnetic activity, and from 3-hour ap values during low to no storm activity.

If you desire to compute the storm indices yourself then you need to download the code file (DTCMAKEDR_code.zip), which contains the Dst and ap values from 1997 through 2007. You then need to use the updated Dst values (DSTFILE.TXT.zip) and ap values (SOLRESAP.TXT.zip), which are updated here daily. The DTCMAKEDR.FOR program will then generate the new DTCFILE.TXT file. This file is the one above currently being automatically generated on this web site.

Kyoto DST data are reprocessed intermittently for periods over the past year. We regularly check for reprocessed data and update our DSTFILE.TXT, which affects DTCFILE.TXT values. Please be advised that DTCFILE.TXT data may change during the past year. We recommend that the most recent files be used.

Beginning in November 2014 the SOLFSMY.TXT file has been updated in the S10 index for the 2006-2009 solar minimum period. The values of S10 are up to 30% lower than measured by satellites as an interim fix to what we now believe is thermospheric cooling by CO2 at the bottom of the thermosphere. We are still studying this issue and may make different modifications to the file in the future.

Note: if the compressed zip files fail to download, you can acquire the files by opening the text files below in your browser and then saving the text to your disk without the .txt extension.

Indices
SOLFSMY.TXT DTCFILE.TXT DSTFILE.TXT SOLRESAP.TXT

 


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