Context :

Aims : We examine high time resolution dynamic spectra for fine structures in type II solar radio bursts

Methods : We used data obtained with the ( SAO ) receiver of the Artemis-JLS ( ARTEMIS-IV ) solar radio spectrograph in the 450–270 MHz range at 10 ms cadence and identified more than 600 short , narrowband features .
Their characteristics , such as instantaneous relative bandwidth and total duration were measured and compared with those of spikes embedded in type IV emissions .

Results : Type II associated spikes occur mostly in chains inside or close to the slowly drifting type II emission .
These spikes coexist with herringbone and pulsating structures .
Their average duration is 96 ms and their average relative bandwidth 1.7 % .
These properties are not different from those of type IV embedded spikes .
It is therefore possible that they are signatures of small-scale reconnection along the type II shock front .

Conclusions :