Ionospheric perturbations ‘decorated’ solar radio dynamic spectrum observed in December

Ionospheric perturbations strongly affect radio propagation, and can produce rather peculiar patterns in the dynamic spectra of solar radio emission (for details – see the paper Meyer-Vernet, N., Daigne, G., and Lecacheux, A., Astronomy and Astrophysics, 1981). Such unusual patterns can be seen in Glasgow radio data as well – see images and the radio data from other radio observatories (CALLISTO status report/news letter #47):