– Real-time F10.7 and Dst values lag by 1-2 days. For historical analysis, download from NASA OMNIWeb or Kyoto Dst .
altitudes = 150:10:800; % km dens_jb = zeros(size(altitudes)); dens_msis = zeros(size(altitudes)); for i = 1:length(altitudes) dens_jb(i) = jb2008(altitudes(i), 0, 0, 80, 43200, 180, 170, 15, -20); dens_msis(i) = atmosnrlmsise00(altitudes(i)*1000, 0, 0, 80, 43200, 180, 170, 15); end jb2008 matlab
% Compute density [dens, T_exo] = jb2008(alt/1000, lat, lon, doy, ut_sec, f10, f10b, ap, dst); – Real-time F10
This plot often reveals a critical divergence: JB2008 predicts a "knee" near 200 km due to molecular oxygen dissociation—a detail smoothed over by older models. 1. Unit Consistency – JB2008 typically expects altitude in kilometers , while most MATLAB functions use meters. Always check the function header. % km dens_jb = zeros(size(altitudes))