Upper Atmosphere Density in 1966–67 : the Dominance of a Semi-annual Variation at Heights near 200 km
1990 ◽
Vol 38
(5)
◽
pp. 637-646
◽
1966 ◽
Vol 14
(9)
◽
pp. 863-869
◽
1965 ◽
Vol 27
(2)
◽
pp. 197-209
◽