双RHESSI TGF的无线电发射
Radio emissions from double RHESSI TGFs
摘要：
详细分析了Ramaty高能太阳光谱成像仪（RHESSI）地面伽马射线闪光（TGFs）与世界范围内的闪电定位网络（WWLLN）的来源和甚低频（VLF）在杜克大学记录的sferics。基于对TGF-WWLLN匹配的分析，评估了RHESSI时钟偏移，发现其在2005年8月5日和2013年10月21日经历了变化。三个观测周期的钟差均小于100 μs。这一结果为RHESSI TGF与其他类型的数据（WWLLN，无线电测量等）进行精确的比较分析提供了可能性。在多峰TGF的情况下，对于与WWLLN源同时的所有16个多峰RHESSI TGF的情况，观察到WWLLN检测与最后的TGF峰同时。杜克大学在这16个事件中的两个事件中记录了甚低频磁场天电。这些无线电测量也将VLF天电归因于双TGF的第二个峰值，在第一个TGF峰值期间没有可检测到的无线电发射。提出了解释这些观察结果的可能情景。双（多峰）TGFs可以帮助区分由+IC前导通道中的反冲电流辐射的VLF无线电发射和来自TGF产生电子的VLF发射。
英文摘要：
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.
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