nificant heating in the thermospheric molecules.
This effect is named geomagnetic activity and is measured by the
International Service of Geomagnetic Indices (<a href="#ISGI">ISGI, 2011</a>), which also
make it available for download. <br>
      <br>
Both the solar flux and geomagnetic activity are compiled and stored in
a single file by the Space Physics Interactive Data Resources (<a href="#SPDIR">SPDIR,
2011</a>), branch of the National Geophysic Data Center. The data can be
found at
this link: