0000000000230049

AUTHOR

Andrew B. Collier

showing 3 related works from this author

A new method reveals more TGFs in the RHESSI data

2012

[1] This letter presents a new search algorithm for identifying Terrestrial Gamma ray Flashes (TGFs) in the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) data. The algorithm has been applied to data from the period 2004–2006 and we have found more than twice as many TGFs as previously reported. The new TGFs follow the same geographical and seasonal variations as the previously reported TGFs. The match percentage between the new TGFs and World Wide Lightning Location Network (WWLLN) data is comparable to the RHESSI catalog TGFs. Our results shows that previous searches only identified the most intense events, and that there might be a large population of faint TGFs.

PhysicsHigh energyGeophysicsGamma rayLarge populationGeneral Earth and Planetary SciencesAstrophysicsWorld wideTerrestrial gamma-ray flashGeophysical Research Letters
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Observation of intrinsically bright terrestrial gamma ray flashes from the Mediterranean basin

2015

Abstract  We present three terrestrial gamma ray flashes (TGFs) observed over the Mediterranean basin by the Reuven Ramaty High Energy Solar Spectroscope Imager (RHESSI) satellite. Since the occurrence of these events in the Mediterranean region is quite rare, the characterization of the events was optimized by combining different approaches in order to better define the cloud of origin. The TGFs on 7 November 2004 and 16 October 2006 came from clouds with cloud top higher than 10–12 km where often a strong penetration into the stratosphere is found. This kind of cloud is usually associated with heavy precipitation and intense lightning activity. Nevertheless, the analysis of the cloud type…

TLEAtmospheric ScienceAtmospheric ElectricityFOS: Physical sciencesAstrophysicsAerosol and CloudsTroposphereAltitudeRaigs gammaPhysics - Space PhysicsEarth and Planetary Sciences (miscellaneous):Matematikk og Naturvitenskap: 400 [VDP]StratosphereResearch ArticlesPhysics:Física [Àrees temàtiques de la UPC]Cloud topGamma raysGamma raythunderstormsLightningMonte Carlo techniqueSpace Physics (physics.space-ph)TGF:Energies::Energia elèctrica [Àrees temàtiques de la UPC]Physics - Atmospheric and Oceanic PhysicsGeophysicsterrestrial gamma ray flashx-ray13. Climate actionSpace and Planetary ScienceAtmospheric and Oceanic Physics (physics.ao-ph)Atmospheric ProcessesThunderstormSatellitelightningResearch ArticleJournal of Geophysical Research. Atmospheres
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A new population of terrestrial gamma‐ray flashes in the RHESSI data

2015

Terrestrial gamma-ray flashes (TGFs) are the most energetic photon phenomenon occurring naturally on Earth. An outstanding question is as follows: Are these flashes just a rare exotic phenomenon or are they an intrinsic part of lightning discharges and therefore occurring more frequently than previously thought? All measurements of TGFs so far have been limited by the dynamic range and sensitivity of spaceborne instruments. In this paper we show that there is a new population of weak TGFs that has not been identified by search algorithms. We use the World Wide Lightning Location Network (WWLLN) to identify lightning that occurred in 2006 and 2012 within the 800 km field of view of Reuven Ra…

High Energy Astrophysical Phenomena (astro-ph.HE)PhysicsHigh energyGamma rayFOS: Physical sciencesAstronomyterrestrial gamma-ray flashesWorld wideLightningNew populationSpace Physics (physics.space-ph)GeophysicsPhysics - Space PhysicsGeneral Earth and Planetary Sciences:Matematikk og Naturvitenskap: 400 [VDP]Astrophysics - High Energy Astrophysical Phenomenalightningfluence distributionsProduction rateGeophysical Research Letters
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