K Indices of Magnetic Activity Relative to an assumed Quiet-day for each 3-Hour PeriodBack to Collection NOAA/NESDIS/NGDC/STP/Indices
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K Indices of Magnetic Activity Relative to an assumed Quiet-day for each 3-Hour Period
The NOAA National Centers for Environmental Information (formerly National Geophysical Data Center) receives the K indices on a current basis from approximately 85 observatories. The K index is a quasi-logarithmic local index of the 3-hourly range in (...etc)

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K Indices
FTP site of K Indices for download
ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/RELATED_INDICES/K_INDICES
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While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the (...etc)

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