  Using a new type of oscillation map, made from the radio spectra by the
wavelet technique, we study the 18 April 2014 M7.3 flare
(SOL2014-04-18T13:03:00L245C017). We find a quasi-periodic character of this
flare with periods in the range 65-115 seconds. At the very beginning of this
flare, in connection with the drifting pulsation structure (plasmoid ejection)
we find the 65-115 s oscillation phase drifting slowly towards lower
frequencies, which indicates an upward propagating wave initiated at the start
of the magnetic reconnection. In the drifting pulsation structure many periods
(1-200 seconds) are found documenting multi-scale and multi-periodic processes.
On this drifting structure fiber bursts with a characteristic period of about
one second are superimposed, whose frequency drift is similar to that of the
drifting 65-115 s oscillation phase. We also check periods found in this flare
by EUV Imaging Spectrometer (EIS)/Hinode and Interface Region Imaging
Spectrograph (IRIS) observations. We recognize the type III bursts (electron
beams) as proposed, but their time coincidence with the EIS and IRIS peaks is
not very good. This is probably due to the radio spectrum beeing a whole-disk
record consisting of all bursts from any location while the EIS and IRIS peaks
are emitted only from locations of slits in the EIS and IRIS observations.
