scholarly journals Spectral Observations of Optical Emissions Associated with Terrestrial Gamma‐Ray Flashes

2020 ◽  
Author(s):  
Matthias Heumesser ◽  
Olivier Chanrion ◽  
Torsten Neubert ◽  
Hugh Christian ◽  
Krystallia Dimitriadou ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Optical Emissions

scholarly journals Spectral Observations of Optical Emissions Associated with Terrestrial Gamma-Ray Flashes

2020 ◽  
Author(s):  
Matthias Heumesser ◽  
Olivier Chanrion ◽  
Torsten Neubert ◽  
Hugh Christian ◽  
Christoph Koehn ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Optical Emissions

scholarly journals Asymmetry in Supernovae

2011 ◽  
Vol 7 (S279) ◽  
pp. 261-268
Author(s):  
Keiichi Maeda
Keyword(s):  
Spherical Symmetry ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Core Collapse ◽  
Late Time ◽  
Innermost Part ◽  
Optical Emissions ◽  
Standard Candle ◽  
Different Types ◽  
Bipolar Type

AbstractAsymmetry in the innermost part of the supernova (SN) ejecta is a key to understanding their explosion mechanisms. Late-time spectroscopy is a powerful tool to investigate the issue. We show what kind of geometry is inferred for different types of SNe – core-collapse SNe Ib/c, those associated with Gamma-Ray Bursts (GRBs), and thermonuclear SNe Ia –, and discuss implications for the explosion mechanisms, observational diversities, and cosmological applications. For SNe Ib/c, the data show the clear deviation from spherical symmetry, and they are most consistent with the bipolar-type explosion as the characteristic geometry. Detailed modeling of optical emissions from SN 1998bw associated with GRB980425 indicates that this SN was in the extreme end of the bipolar explosion, suggesting that the explosion mechanisms of canonical SNe Ib/c and GRB-SNe are different. The situation is different for SNe Ia. Late-time spectra indicate the deviation from spherical symmetry, but for SNe Ia the explosion is asymmetric between two hemispheres, i.e., one-sided explosions. The diversities arising from different viewing directions can nicely explain (a part of) observational diversities of SNe Ia, and correcting this effect may improve the standard-candle calibration of SNe Ia for cosmology.

scholarly journals GRB 060607A: a gamma-ray burst with bright asynchronous early X-ray and optical emissions

2008 ◽  
Vol 385 (1) ◽  
pp. 453-467 ◽  
Author(s):  
Houri Ziaeepour ◽  
Stephen T. Holland ◽  
Patricia T. Boyd ◽  
Kim Page ◽  
Samantha Oates ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
X Ray ◽  
Optical Emissions

Simultaneous space-based observations of terrestrial gamma-ray flashes and lightning optical emissions: Investigation of the terrestrial gamma-ray flash production mechanisms

2019 ◽  
Vol 100 (8) ◽  
Author(s):  
Samer T. Alnussirat ◽  
Hugh J. Christian ◽  
Gerald J. Fishman ◽  
Jeffrey Burchfield ◽  
Michael L. Cherry
Keyword(s):  
Gamma Ray ◽  
Optical Emissions ◽  
Production Mechanisms

scholarly journals Optical emissions associated with terrestrial gamma ray flashes

2015 ◽  
Vol 120 (2) ◽  
pp. 1355-1370 ◽  
Author(s):  
Wei Xu ◽  
Sebastien Celestin ◽  
Victor P. Pasko
Keyword(s):  
Gamma Ray ◽  
Optical Emissions

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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