A detailed analysis of Reuven Ramaty High Energy Solar Spectroscopic Imager
(RHESSI) terrestrial gamma ray flashes (TGFs) is performed in association with
World Wide Lightning Location Network (WWLLN) sources and very low frequency
(VLF) sferics recorded at Duke University. RHESSI clock offset is evaluated and
found to experience changes on the 5 August 2005 and 21 October 2013, based on
the analysis of TGF-WWLLN matches. The clock offsets were found for all three
periods of observations with standard deviations less than 100 {\mu}s. This
result opens the possibility for the precise comparative analyses of RHESSI
TGFs with the other types of data (WWLLN, radio measurements, etc.) In case of
multiple-peak TGFs, WWLLN detections are observed to be simultaneous with the
last TGF peak for all 16 cases of multipeak RHESSI TGFs simultaneous with WWLLN
sources. VLF magnetic field sferics were recorded for two of these 16 events at
Duke University. These radio measurements also attribute VLF sferics to the
second peak of the double TGFs, exhibiting no detectable radio emission during
the first TGF peak. Possible scenarios explaining these observations are
proposed. Double (multipeak) TGFs could help to distinguish between the VLF
radio emission radiated by the recoil currents in the +IC leader channel and
the VLF emission from the TGF producing electrons
