scholarly journals Terrestrial gamma ray flash production by active lightning leader channels

2010 ◽  
Vol 115 (A10) ◽  
pp. n/a-n/a ◽  
Author(s):  
B. E. Carlson ◽  
N. G. Lehtinen ◽  
U. S. Inan
Keyword(s):  
Gamma Ray ◽  
Lightning Leader

A Satellite‐Detected Terrestrial Gamma Ray Flash Produced by a Cloud‐to‐Ground Lightning Leader

2020 ◽  
Vol 47 (15) ◽  
Author(s):  
Yunjiao Pu ◽  
Steven A. Cummer ◽  
Anjing Huang ◽  
Michael Briggs ◽  
Bagrat Mailyan ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Cloud To Ground Lightning ◽  
Lightning Leader

scholarly journals Lightning leader altitude progression in terrestrial gamma‐ray flashes

2015 ◽  
Vol 42 (18) ◽  
pp. 7792-7798 ◽  
Author(s):  
Steven A. Cummer ◽  
Fanchao Lyu ◽  
Michael S. Briggs ◽  
Gerard Fitzpatrick ◽  
Oliver J. Roberts ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Lightning Leader

Simultaneous detection of lightning flashes by MMIA-ASIM and Colombia Lightning Mapping Array

2020 ◽  
Author(s):  
Jesús Alberto López ◽  
Joan Montanyà ◽  
Oscar van der Velde ◽  
Ferran Fabró ◽  
Javier Navarro ◽  
...  
Keyword(s):  
Multispectral Imaging ◽  
Gamma Ray ◽  
Detection Efficiency ◽  
Simultaneous Detection ◽  
Space Station ◽  
Optical Emission ◽  
High Energy ◽  
Tropical Region ◽  
Mapping Array ◽  
Lightning Leader

<p>Since April 2018, the Atmosphere-Space Interactions Monitor (ASIM) has been in operation on board the International Space Station (ISS). ASIM is composed of the Modular X-and Gamma Ray Sensor (MXGS) as well as a multispectral and high resolution array of photometers and cameras, called the Modular Multispectral Imaging Array (MMIA). These instruments allow us to investigate Terrestrial Gamma-Flashes, Transient Luminous Events and their interactions with thunderstorms and lightning flashes.</p><p>The Colombia Lightning Mapping Array (COL-LMA), operational since 2017, is the first VHF range network installed and working in a tropical region, and can contribute to the electrical understanding of thunderstorms and lightning leader processes associated with high energy phenomena in the upper atmosphere.</p><p>This work employs data from the MMIA array to investigate optical emission patterns at different bands (337 nm, 180-230 nm and 777.4 nm) caused by lightning leader development and cloud-to-ground flashes, derived from the COL-LMA and LINET network respectively. All cases are also correlated with optical observation from the Lightning Imaging Sensor (LIS) on board the ISS, and the Geostationary Lightning Mapper sensor on the GOES-R satellite.</p><p>The region of study is defined by the high detection-efficiency area of the COL-LMA around the Magdalena river valley. MMIA-ASIM information since July 2019 corresponding to passes over this tropical region has been analysed.</p>

Constraining the Origin Altitude of the first Satellite-Detected Reverse-Beam Terrestrial Gamma-ray Flash Produced by a Cloud-to-Ground Lightning Leader. 

2021 ◽  
Author(s):  
Jeffrey Chaffin ◽  
David Smith ◽  
Steven Cummer ◽  
Yunjiao Pu ◽  
Michael Splitt
Keyword(s):  
Gamma Ray ◽  
Radio Pulse ◽  
Low Frequency ◽  
Positron Beam ◽  
Strongly Correlated ◽  
Return Stroke ◽  
Cloud To Ground Lightning ◽  
Main Discharge ◽  
Lightning Leader ◽  
Meteorological Analysis

<p>We provide an updated analysis of the gamma-ray signature of a terrestrial gamma ray flash (TGF) detected by the Fermi Gamma-ray Burst Monitor first reported by Pu et al. 2020. Gamma-ray photons were produced 3ms prior to a negative cloud-to-ground return stroke and were close to simultaneous with an isolated low frequency radio pulse during the leaders propagation, with a polarity indicating downward moving negative charge. This ‘slow’ low frequency signal occurring prior to the main discharge has previously been strongly correlated with upward directed TGF events (Pu et al. 2019, Cummer et al. 2011) leading the authors to conclude that the Fermi detected counts just prior to the return stroke are the result of a reverse positron beam generating upward directed gamma rays.<span>  </span>We investigate the feasibility of this scenario and constrain the limits on the origin altitude from the perspective of the gamma-ray signature timing uncertainties, TGF Monte Carlo simulations, estimates of intrinsic brightness as a function of altitude, and meteorological analysis of the storm and its possible charge structure and altitude.</p>

Gamma-ray flash from a lightning leader

Science ◽  
2020 ◽  
Vol 367 (6474) ◽  
pp. 158.5-159
Author(s):  
Keith T. Smith
Keyword(s):  
Gamma Ray ◽  
Lightning Leader

scholarly journals Analysis of Individual Terrestrial Gamma‐Ray Flashes With Lightning Leader Models and Fermi Gamma‐Ray Burst Monitor Data

2019 ◽  
Vol 124 (8) ◽  
pp. 7170-7183 ◽  
Author(s):  
B. G. Mailyan ◽  
W. Xu ◽  
S. Celestin ◽  
M. S. Briggs ◽  
J. R. Dwyer ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Lightning Leader ◽  
Monitor Data

On the possible gamma-ray source in Cygnus

1967 ◽  
Vol 31 ◽  
pp. 469-471
Author(s):  
J. G. Duthie ◽  
M. P. Savedoff ◽  
R. Cobb
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Right Ascension

A source of gamma rays has been found at right ascension 20h15m, declination +35°, with an uncertainty of 6° in each coordinate. Its flux is (1·5 ± 0·8) x 10-4photons cm-2sec-1at 100 MeV. Possible identifications are reviewed, but no conclusion is reached. The mechanism producing the radiation is also uncertain.

Solar Flare Energetic Neutral Emission Measurements in the Project Coronas-I

1994 ◽  
Vol 144 ◽  
pp. 635-639
Author(s):  
J. Baláž ◽  
A. V. Dmitriev ◽  
M. A. Kovalevskaya ◽  
K. Kudela ◽  
S. N. Kuznetsov ◽  
...  
Keyword(s):  
Solar Flare ◽  
Energy Range ◽  
Gamma Rays ◽  
Pulse Shape ◽  
Gamma Ray ◽  
Pulse Shape Discrimination ◽  
Shape Discrimination ◽  
Solar Neutron ◽  
Low Altitude

AbstractThe experiment SONG (SOlar Neutron and Gamma rays) for the low altitude satellite CORONAS-I is described. The instrument is capable to provide gamma-ray line and continuum detection in the energy range 0.1 – 100 MeV as well as detection of neutrons with energies above 30 MeV. As a by-product, the electrons in the range 11 – 108 MeV will be measured too. The pulse shape discrimination technique (PSD) is used.

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