Radio emissions fromdouble RHESSI TGFs


Journal Article

© 2016. The Authors. 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 µs. 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.

Full Text

Duke Authors

Cited Authors

  • Mezentsev, A; Østgaard, N; Gjesteland, T; Albrechtsen, K; Lehtinen, N; Marisaldi, M; Smith, D; Cummer, S

Published Date

  • January 1, 2016

Published In

Volume / Issue

  • 121 / 13

Start / End Page

  • 8006 - 8022

Electronic International Standard Serial Number (EISSN)

  • 2156-2202

International Standard Serial Number (ISSN)

  • 0148-0227

Digital Object Identifier (DOI)

  • 10.1002/2016JD025111

Citation Source

  • Scopus