HR: 16:40h
AN: AE44A-04 INVITED    [Abstracts]
TI: Analysis of Los Alamos Sferic Array Observations of Lightning Discharge Events Correlated with Terrestrial Gamma-ray Flashes
AU: * Shao, X
EM: xshao@lanl.gov
AF: Los Alamos National Laboratory, ISR-2, MS D436, Los Alamos, NM 87545, United States
AU: Harlin, J
EM: harlin@lanl.gov
AF: Los Alamos National Laboratory, ISR-2, MS D436, Los Alamos, NM 87545, United States
AU: Hamlin, T
EM: thamlin@lanl.gov
AF: Los Alamos National Laboratory, ISR-2, MS D436, Los Alamos, NM 87545, United States
AU: Smith, D M
EM: dsmith@scipp.ucsc.edu
AF: University of California, Santa Cruz, 1156 High Street Santa Cruz, Santa Cruz, CA 95064, United States
AB: Since April 2004, Los Alamos National Laboratory has operated a new and upgraded sferic sensor array, the Los Alamos Sferic Array (LASA), for lightning study in Florida and over the Great Plains. In July 2006, additional sensors were deployed to Key West, the Bahamas, and the Cayman Islands to better cover the Caribbean region. During this time period, LASA has observed a number of lightning discharge events that were closely associated with terrestrial gamma-ray flashes (TGFs) detected by the RHESSI satellite. Unlike some other existing lightning detection networks, LASA records full radio waveforms produced by lightning, in a broad frequency range of 0.16 500 KHz. The time waveform allows us to study the discharge properties in a great detail and, most importantly, enables the determination of the discharge height for some of the TGF-related events. In this presentation the four-year LASA observations of TGF events will be summarized. The associated charge moment change, peak current, discharge altitude and location (as referenced to RHESSI's position) will be discussed.
DE: 3304 Atmospheric electricity
DE: 3324 Lightning
DE: 7554 X-rays, gamma rays, and neutrinos
SC: Atmospheric and Space Electricity [AE]
MN: 2007 Fall Meeting