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I need to create an online service displaying latest Kp index.

Where I can take the data?

The data should be in machine-readable format, i.e. text files, XML, or CGI gateways, for instance. No graphical plots!

I found this: http://www.swpc.noaa.gov/wingkp/wingkp_list.txt

Is Est. Kp what I need? I compared the data with plots covering several last days and found that kp values in this file are lower that on the charts.

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You are familiar with the contents of this page gellerlabs.com/PMAG/10%2020%2010%20Wing%20Kp%20Model.pdf, I presume? –  Roy Simpson Mar 27 '11 at 23:12
As for the format, I'm familiar with it. swpc.noaa.gov/info/glossary.html#e : <<<Estimated 3-hourly Kp indices are derived in real time from a network of western hemisphere ground-based magnetometers. These indices may differ from the final Kp values derived montly by the GeoForschungsZentrum, Potsdam, Germany, using a global network of magnetometers.>>> May estimated Kp be used as a source for Kp data? –  semyon Mar 28 '11 at 15:05
In a sense the answer to that question depends on your requirements for this website given that the data is estimated on a regular basis, and then determined more accurately on a monthly basis. So you may have to use your increased knowledge of Kp to determine what the website users actually want: timeliness or accuracy. –  Roy Simpson Mar 28 '11 at 15:24
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