scholarly journals Terrestrial gamma ray flashes and lightning discharges

2006 ◽  
Vol 33 (18) ◽  
pp. n/a-n/a ◽  
Author(s):  
U. S. Inan ◽  
M. B. Cohen ◽  
R. K. Said ◽  
D. M. Smith ◽  
L. I. Lopez
Keyword(s):  
Gamma Ray ◽  
Lightning Discharges

ASIM TGFs associated with high peak current strokes

2021 ◽  
Author(s):  
Andrey Mezentsev ◽  
Nikolai Østgaard ◽  
Torsten Neubert ◽  
Victor Reglero
Keyword(s):  
International Space Station ◽  
Short Duration ◽  
Gamma Ray ◽  
Space Station ◽  
High Peak ◽  
Science Data ◽  
Peak Current ◽  
International Space ◽  
Lightning Discharges

<p>The Atmosphere-Space Interactions Monitor (ASIM) has been installed on board of the International Space Station in April 2018, successfully providing science data for 2.5 years. The Modular X- and Gamma-ray Sensor (MXGS) of ASIM is designed to detect Terrestrial Gamma-ray Flashes (TGFs) (short intense bursts of gamma-ray photons), produced during the initial breakdown phase of the +IC lightning discharges.</p><p> </p><p>In this contribution we report and summarize the results on the ASIM TFGs associated with high peak current lightning detections (detected by GLD and WWLLN networks). High peak current detections tend to be associated with short duration TGFs and do not exhibit a tendency to correlate with the fluence of the TGF.</p>

High Peak‐Current Lightning Discharges Associated With Downward Terrestrial Gamma‐Ray Flashes

2020 ◽  
Vol 125 (4) ◽  
Author(s):  
Y. Wada ◽  
T. Enoto ◽  
Y. Nakamura ◽  
T. Morimoto ◽  
M. Sato ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Peak ◽  
Peak Current ◽  
Lightning Discharges

scholarly journals Ground-Based Observations of Terrestrial Gamma Ray Flashes Associated with Downward-Directed Lightning Leaders

2019 ◽  
Vol 197 ◽  
pp. 03002
Author(s):  
Rasha Abbasi ◽  
John Belz ◽  
Ryan Le Von ◽  
Dan Rodeheffer ◽  
Paul Krehbiel ◽  
...  
Keyword(s):  
Electric Field ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Three Dimensional ◽  
Temporal Distribution ◽  
Cosmic Ray ◽  
Ground Level ◽  
High Energy ◽  
Lightning Strikes ◽  
Lightning Discharges

Terrestrial gamma-ray flashes (TGFs) are bursts of gamma-rays initiated in the Earth’s atmosphere. TGFs were serendipitously first observed over twenty years ago by the BATSE gamma ray satellite experiment. Since then, several satellite experiments have shown that TGFs are produced in the upward negative breakdown stage at the start of intracloud lightning discharges. In this proceeding, we present ground-based observation of TGFs produced by downward negative breakdown occurring at the beginning of negative cloud-to-ground flashes. The Terrestrial gamma-ray flashes discussed in this work were detected between 2014-2017 at ground level by the Telescope Array surface detector (TASD) together with Lightning Mapping Array (LMA) and the slow electric field antenna (SA). The TASD detector is a 700 km2 ultra high energy cosmic ray detector in the southwestern desert of Utah. It is comprised of 507 (3 m2) plastic scintillator detectors on a 1.2 km square grid. The LMA detector, a three-dimensional total lightning location system, is comprised of nine stations located within and around the array. The slow electric field antenna records the electric field change in lightning discharges. The observed Gamma ray showers were detected in the first 1-2 ms of downward negative breakdown prior to cloud-to-ground lightning strikes. The shower sources were observed by the LMA detector at altitudes of a few kilometers above ground level. The detected energetic burst showers have a footprint on the ground typically ~ 3-5 km in diameter. The bursts comprise of several (2-5) individual pulses, each of which have a span of a few to tens of microseconds and an overall duration of several hundred microseconds. Using a forward-beamed cone of half-angle of 16 degrees, GEANT simulation studies indicate that the showers are consistent with gamma rays of 1012 - 1014 primary photons. We hypothesize that the observed terrestrial gamma-ray flashes are similar to those detected by satellites, but that the ground-based observations are closer to the source and therefore are able to observe weaker sources and report on the structure of the temporal distribution at the source. This result and future studies will enable us to better identify and constrain the mechanisms of downward TGF production.

Lightning optical context associated with ASIM TGFs

2020 ◽  
Author(s):  
Andrey Mezentsev ◽  
Nikolai Østgaard ◽  
Martino Marisaldi ◽  
Pavlo Kochkin ◽  
Torsten Neubert ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Space Station ◽  
High Energy ◽  
Relative Timing ◽  
Science Data ◽  
Timing Accuracy ◽  
Transient Luminous Events ◽  
Imaging Array ◽  
Lightning Discharges ◽  
Energy Detectors

<p>Launched and installed at the International Space Station in April 2018, the Atmosphere-Space Interactions Monitor (ASIM) provides science data since June 2018. Suite of onboard instruments contains optical and high energy detectors payloads. Modular Multi-spectral Imaging Array (MMIA) includes three photometers (180-240 nm, 337 nm and 777.4 nm) sampling at 100 kHz, and two cameras (337 nm and 777.4 nm) sampling at 12 Hz. It allows for lightning and transient luminous events (TLEs) observations during the orbital eclipses. The Modular X- and Gamma-ray Sensor (MXGS) detects X- and Gamma-ray photons, and is dedicated to detection of Terrestrial Gamma-ray Flashes (TGFs). The mutual relative timing accuracy between MXGS and MMIA is as good as +/- 5 µs.</p><p> </p><p>TGFs are known to be associated with the +IC lightning discharges. ASIM provides a unique possibility for simultaneous observations of TGFs together with the underlying optical activity inside the thundercloud. In this contribution we summarize the almost two years of ASIM observations to make an overview of the various optical contexts accompanying the TGF production.</p>

scholarly journals Variations of gamma-ray during thunderstorm by observations in Yakutsk

2020 ◽  
Vol 196 ◽  
pp. 01012
Author(s):  
Anatoliy Toropov ◽  
Sergey Starodubtsev ◽  
Vladimir Kozlov ◽  
Juriy Balabin
Keyword(s):  
Electric Field ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Measurement Range ◽  
Analog Signal ◽  
Gamma Detector ◽  
Gamma Background ◽  
Lightning Discharges ◽  
In Series ◽  
Electromagnetic Signals

The paper presents the results of a study of the increase in the gamma background in the surface layer of the atmosphere during near thunderstorms in Yakutsk (based on the Cosmic Ray Spectrograph of the IKFIA SB RAS). To register the gamma background, scintillation detectors based on NaI (Tl) crystals with a size of 63mm x 63mm are used. The range of measured energies is 20-1900 keV. The detectors are closed from the sides and bottom with lead (5 cm) and placed in thermoboxes with a glass window. The detector is located on the roof of the Cosmic Ray Spectrograph building in Yakutsk. Also, synchronous registration of the atmospheric electric field strength was carried out using an atmosphere electric field – mill sensor (with measurement range +/- 50 kV / m).The data of continuous recording of an analog signal from a detector during the nearest thunderstorms of 2018 were considered. The analog signal from the gamma detector was fed to the first channel of the E20-10 ADC (L-Card) and recorded continuously on the computer hard disk for one hour (during a thunderstorm) in series of 10 minutes. A signal from an active broadband dipole P-10 antenna (0.9 kHz - 900 MHz bandwidth) was fed to the second channel and was also recorded in one file together with the signal from the gamma detector. Synchronous recording of signals from the gamma detector and from the antenna allows accurate timing of gamma photons to electromagnetic signals from nearby lightning. In the studied thunderstorms, based on the results of the analysis of the data obtained, statistically significant variations in the count rate and shapes of the spectrum of gamma – ray at the moment of lightning discharges were found.

scholarly journals A link between terrestrial gamma-ray flashes and intracloud lightning discharges

2006 ◽  
Vol 33 (6) ◽  
Author(s):  
Mark A. Stanley ◽  
Xuan-Min Shao ◽  
David M. Smith ◽  
Liliana I. Lopez ◽  
Morris B. Pongratz ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Lightning Discharges

scholarly journals Gamma-ray bursts and other sources of giant lightning discharges in protoplanetary systems

2005 ◽  
Vol 429 (3) ◽  
pp. L41-L45 ◽  
Author(s):  
B. McBreen ◽  
E. Winston ◽  
S. McBreen ◽  
L. Hanlon
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Lightning Discharges
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