Solar activity was at low levels on 18, 20, and 21 August with only C-class flares observed. Activity increased to moderate levels on 19 August following an M1.1 flare at 19/0439 UTC from an area beyond the Eastern limb. Moderate levels were also observed on 22 August as Region 4191 produced a long-duration M1.7/Sf flare. Associated with this flare was a Type II radio sweep with an estimated…
