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| Publications [#355641] of Steven A. Cummer
Papers Published
- Mailyan, B; Stanbro, M; Briggs, MS; Cummer, S; Dwyer, JR; Roberts, OJ; Holzworth, R, Radio Frequency Emissions Associated With Multi-Pulsed Terrestrial Gamma-Ray Flashes,
Journal of Geophysical Research: Space Physics, vol. 126 no. 2
(February, 2021) [doi]
(last updated on 2023/06/01)
Abstract:
Terrestrial Gamma-ray Flashes (TGFs) with multiple pulses have been observed many times since their discovery in the 1990s. The BATSE sample of TGFs had a large fraction of multi-pulsed TGFs. It was not until later instruments, such as RHESSI, that the sample of detected TGFs consisted mostly of single-peaked, sub-millisecond events. Recent research has focused chiefly on these common single pulsed events, but several questions can be answered by analyzing multi-pulse TGFs. One is the relationship between very low frequency (VLF) radio signals and the gamma-ray pulses of TGFs. This paper discusses multi-pulsed TGFs observed by Fermi Gamma-ray Burst Monitor and their associated radio frequency pulses. In our data set of 29 multi-pulse TGFs, 22 have a VLF association only with the last gamma-ray pulse. However, unlike previous studies, we identified several events having radio matches with the first or both gamma-ray pulses of double-pulse TGFs. The absence of a VLF signal can be due to detection efficiency. On the other hand, the lack of correlation between radio and gamma-ray intensities for some TGFs, cannot be explained by existing models. The models should be revised taking into account recent observations.
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