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Type III bursts and hard X-rays are both produced by flare energetic electronbeams. The link between both emissions has been investigated in many previousstudies, but no statistical studies have compared both coronal andinterplanetary type III bursts with X-ray flares. Using coronal radio eventsabove 100 MHz exclusively from type III bursts, we revisited long-standingquestions: Do all coronal type III bursts have X-ray counterparts. Whatcorrelation, if any, occurs between radio and X-ray intensities. What X-ray andradio signatures above 100 MHz occur in connection with interplanetary type IIIbursts below 14 MHz. We analysed data from 2002 to 2011 starting with coronaltype III bursts above 100 MHz. We used RHESSI X-ray data greater than 6 keV tomake a list of 321 events that have associated type III bursts and X-rayflares, encompassing at least 28 percent of the initial sample of type IIIevents. We examined the timings, intensities, associated GOES class, and anyinterplanetary radio signature. For our 321 events, the X-ray emission at 6 keVusually lasted longer than type III burst groups at frequencies greater than100 MHz. A weak correlation was found between the type III radio flux atfrequencies below 327 MHz and the X-ray intensity at 25-50 keV, with an absenceof events at high X-ray intensity and low type III radio flux. Interplanetarytype III bursts less than 14 MHz were observed for 54 percent of the events,increasing when events were observed with 25-50 keV X-rays. A strongerinterplanetary association was present when 25-50 keV count rates were above250 counts per second or 170 MHz fluxes were greater than 1000 SFU, relating tomore energetic electrons above 25 keV and events where magnetic flux tubesextend into the high corona. On average type III bursts increase in flux withdecreasing frequency, the rate varies from event to event.

Coronal type III radio bursts and their X-ray flare and interplanetary type III counterparts