model with solar flux data file, it is time to update it
with fresh new values. You may update it once a year, since the
observed flux
and geomagnetic indexes are also available yearly. So, go to </span></span><span style="font-family: MS Sans Serif;"></span><a style="font-family: MS Sans Serif;" href="ftp://ftp.ngdc.noaa.gov/STP/GEOMAGNETIC_DATA/INDICES/KP_AP/">ftp://ftp.ngdc.noaa.gov/STP/GEOMAGNETIC_DATA/INDICES/KP_AP/</a><span style="font-family: &quot;MS Sans Serif&quot;;" lang="EN-US"><span style="f