Table 1 Average and peak abundances for Na, Fe, and Ne on two nights at Arecibo
From: Dependence of mesospheric Na and Fe distributions on electron density at Arecibo
Date | Altitude (km) | Na abundance (109 × cm−2) | Fe abundance (109 × cm−2) | Ne abundance (109 × cm−2) | |||
|---|---|---|---|---|---|---|---|
Average | Max. | Average | Max. | Average | Max. | ||
17 March 2004 | 82–92 | 0.5 | 0.9 | 4.2 | 5.5 | - | - |
93–103 | 0.8 | 1.4 | 2.0 | 2.8 | 1.8 | 18.0 | |
18 March 2004 | 82–92 | 0.7 | 0.9 | 5.4 | 6.8 | - | - |
93–103 | 0.8 | 1.2 | 1.7 | 2.1 | 2.0 | 5.7 | |