## A study of the semiannual density variation in the upper atmosphere from 1958 to 1966: based on satellite drag analysis |

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10-day means 7-cm solar flux Alpha amplitude Amsterdam atmospheric variations combining the data computed the means courbes data column DAYS SINCE JANUARY diagram of Figure diurnal diurnal variation DRAG ANALYSIS L. G. drag of six electron density empirical formulas equation H3MeHeHHe Harvard College hauteur de périgée Ionosphere irrespective of perigee J. W. Slowey Jacchia and Slowey January 15 joined SAO July July 30 last diagram maxima and minima maximum mean residuals North-Holland Publ observed density variations orbital perigee height Pr4mary recent results results by Jacchia SATELLITE DRAG ANALYSIS satellites are strictly satellites in Figure second diagram SEMIANNUAL DENSITY VARIATION semiannual temperature variation semiannual variation normalized six artificial satellites six satellites Smithsonian Astrophys Smithsonian Astrophysical Observatory Smithsonian Institution smooth curve solar-activity effect Space Research Space Sci sunspot minimum systematic difference Systematic residuals temperature residuals thermosphere upper atmosphere variation bi-annuelle variations at essentially weighted means YONEZAWA zero line