RHESSIRamaty High Energy Solar Spectroscopic Imager (NASA mission)
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2015) used data from two instruments on the Tropical Rainfall Measuring Mission (TRMM) to study the storms related to RHESSI TGFs.
The most detailed meteorological observations of a TGF are those of the TGF detected by RHESSI over Tennessee on 26 July 2008.
The first studies were unable to determine the temporal order of the gamma ray and radio signals, limited by the timing accuracy of RHESSI (Grefenstette et al.
An analysis of the summed spectra of 289 TGFs observed with RHESSI for the amount of atmosphere traversed by the gamma rays indicated a source altitude of 15-21 km (Dwyer and Smith 2005).
This contrasts with the TGF latitude distribution found with RHESSI (38[degrees] inclination orbit), which shows that most TGFs are within [+ or -] 20[degrees] latitude (Smith et al.
Smith, 2012: A new method reveals more TGFs in the RHESSI data.
Lopez, 2009: First RHESSI terrestrial gamma ray flash catalog.
The RHESSI telescope was built and launched in 2002 to observe the hottest, most energetic events on the Sun.
RHESSI sees mainly hard X-rays and gamma rays, the same radiation that sends astronauts scrambling for shelter.
RHESSI found that the ions near a flare get flung in one direction, and the electrons get thrown in a completely different direction.
Another surprise from RHESSI is that flares create antimatter and fling it tens of thousands of miles before it collides with regular matter elsewhere on the Sun.
One remarkable RHESSI finding is that the high-energy radiation from a gamma-ray burst is highly polarized--the gamma-ray waves preferentially wiggle in the same plane.