n.<br><br>
      </span>
      <div style="text-align: center;"><span style="font-family: ms sans serif;"><big><big><span style="font-weight: bold;">Jacchia&#8217;s 77</span></big></big></span><br>
      <span style="font-family: ms sans serif;"></span></div>
      <span style="font-family: ms sans serif;"> <br>
Jacchia improved his model with recently (at that time) satellite
observations and orbit measuring. The <a href="#Jacchia_1977">77&#8217;s</a> integrates the diffusion
equation for each indiv