 at a given date. The flux varies with solar
activity, which presents a 10.6 years cycle. </span><span style="font-size: 12pt; font-family: &quot;MS Sans Serif&quot;;" lang="EN-US">The
Dominion Radio Astrophysical Observatory (<a href="#DRAO">DRAO,
2011</a>) measures the flux daily. The data is available for download at
the
Observatory site. <br style="">
      </span><span style="font-family: ms sans serif;"><br>
During solar storms, the solar wind deflects the geomagnetic field,
which causes a sig