Millisecond solar radio bursts in the metric wavelength range

A study and classification of super‐short structures (SSSs) recorded during metric type IV bursts is presented. The most important property of SSSs is their duration, at half power ranging from 4–50 ms, what is up to 10 times shorter than spikes at corresponding frequencies. The solar origin of the SSSs is confirmed by one‐to‐one correspondence between spectral recordings of Artemis‐IV1 and high time resolution single frequency measurements of the TSRS2.We have divided the SSSs in the following categories:1. Broad‐Band SSSs: They were partitioned in two subcategories, the SSS‐Pulses and Drifting SSSs;2. Narrow‐band: They appear either as Spike‐Like SSSs or as Patch‐Like SSSs;3. Complex SSS: They consist of the absorption‐emission segments and were morphologically subdivided into Rain‐drop Bursts (narrow‐band emission head and a broad‐band absorption tail) and Blinkers.