Figure 4. Measurements of
electron density variation at 70 km (1) and calculations (2-5)
carried out by four values of [O
3] ozone concentration:
5.0 107 cm-3 (2),
2.2
108 cm-3 (3),
109 cm-3 (4),
and
6.0
1010 cm-3 (5) during
13 August 1989 proton event (a)
and 23 October 1989
proton event (b).