Transient Gamma-Ray Emissions Related to Thunderstorms: Coordinated RHESSI and CORONAS-F Observations

Details Transient Gamma-Ray Emissions Related to Thunderstorms: Coordinated RHESSI and CORONAS-F Observations Transient Gamma-Ray Emissions Related to Thunderstorms: Coordinated RHESSI and CORONAS-F Observations

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmae33a0948k&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #AE33A-0948

Physics

2716 Energetic Particles: Precipitating, 3359 Radiative Processes, 7807 Charged Particle Motion And Acceleration

Scientific paper

Transient gamma-ray emissions from the Earth's atmosphere with duration of a few milliseconds and associated with lightning discharges were discovered by the BATSE/CGRO instrument in 1994, and new features have been recently reported from the RHESSI measurements. These so-called terrestrial gamma-ray flashes (TGFs) are thought to be bremsstrahlung photons from energetic electron beams above the thunderstorms. The SOlar Neutron and Gamma rays (SONG) experiment aboard low altitude (~ 500 km) polar orbiting (~ 83°) CORONAS-F satellite, designed to detection of neutral particles from the Sun, provides 1-s measurements of hard X-rays/gamma rays in range of 30 keV to 200 MeV. The SONG consists of large effective area (≤ 314 cm2) omnidirectional scintillator well suited for detection fluxes coming from the various directions from the Earth's atmosphere. We have identified cases when the RHESSI spacecraft, observing gamma-ray flashes at an altitude of about 600 km, and CORONAS-F passed through the same regions in period April 2002 - January 2005. The simultaneous gamma-ray measurements will be reviewed and discussed. Recent analysis of the SONG data have revealed observations of the enhanced hard X-ray emissions (above 50 times the background value) above geomagnetically conjugate regions to the lightning. The issue of freshly accelerated TGF electrons from the lightning itself, contributing to the precipitated radiation-belt electrons will be discussed too.

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