Investigating the relationship between TGF durations and the onset times of the optical pulses and the TGFs

2021 ◽  
Author(s):  
Chris Alexander Skeie ◽  
Nikolai Østgaard ◽  
Andrey Mezentsev ◽  
Ingrid Bjørge-Engeland ◽  
David Sarria ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Space Station ◽  
High Energy ◽  
Optical Measurements ◽  
Temporal Uncertainty ◽  
Optical Pulses ◽  
International Space ◽  
Imaging Array ◽  
Lightning Detection ◽  
The Relationship

<p><em>We investigate and determine the sequence of the Terrestrial Gamma-ray Flashes (TGFs) and the observed optical emissions associated with lightning flashes, as well as the connection between the duration of TGFs and the time between the onset of the TGFs and the observed main optical pulses. Over 200 observations from the instruments of the Atmosphere-Space Interactions Monitor (ASIM) on board the International Space Station (ISS) are used, together with data from the lightning detection networks GLD360 and WWLLN. The ASIM data consist of two separate recordings: High energy measurements from the Modular X- and Gamma-ray Sensor (MXGS), and optical measurements from the Modular Multi-Spectral Imaging Array (MMIA). The optical measurements are from photometers operating in the 337 and 777.4 nm bands, and the temporal uncertainty between the two instruments of ASIM is +- 5 µs.</em></p>

Analysis of Elves observations from about 2 years of ASIM operation.

2020 ◽  
Author(s):  
Olivier Chanrion ◽  
Torsten Neubert ◽  
Chiara Zuccoti ◽  
Matthias Heumesser ◽  
Krystallia Dimitriadou ◽  
...  
Keyword(s):  
Electromagnetic Pulse ◽  
Multispectral Imaging ◽  
Gamma Ray ◽  
Space Station ◽  
Low Frequency ◽  
International Space ◽  
Very Low Frequency ◽  
Spatial And Temporal Distributions ◽  
Imaging Array ◽  
Lightning Detection

<p>The Atmosphere-Space Interaction (ASIM) mission was launched on April 2, 2018 and installed on an external platform of the Columbus Module of the International Space Station the 13th.</p><p>The main objectives of the mission are to observe and study thunderstorms and their interaction with the atmosphere. ASIM embarks two main instruments pointing at Nadir, the Modular Multispectral Imaging Array (MMIA) observing in the visible and the Modular X- and Gamma- ray Sensor (MXGS) observing in the X- and Gamma-ray bands.</p><p>In this presentation we focus on observations made by the MMIA which includes two cameras operating in the bands 337/5 nm and 777.4/3 nm and three photometers operating in the bands 180-230 nm, 337/5 nm and 777.4/5 nm. Specifically, we analyze the short duration pulses recorded in the 180-230 nm band.</p><p>After about 2 years of operations, more than 2500 of such events were identified in the data. They are likely to be recordings of ELVEs (Emissions of Light and Very low frequency perturbation due to Electromagnetic pulse sources), occurring in the ionosphere in response to lightning currents.</p><p>We show the amplitude, spatial and temporal distributions of the events and compare the results with those of previous studies. We present an analysis of the temporal characteristics of the pulses themselves and of their delays regarding the parent lightning observed in the other ASIM photometers or in the GLD360 ground lightning detection network recordings. Finally, we compare some typical events with modeling.</p>

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 The CALorimetric Electron Telescope (CALET) on the International Space Station: Results from the First Two Years of Operation

2019 ◽  
Vol 208 ◽  
pp. 13001
Author(s):  
Y Asaoka ◽  
O Adriani ◽  
Y Akaike ◽  
K Asano ◽  
MG Bagliesi ◽  
...  
Keyword(s):  
International Space Station ◽  
Gamma Ray ◽  
Space Station ◽  
Cosmic Ray ◽  
The United States ◽  
High Energy ◽  
Positron Energy ◽  
International Space ◽  
Long Term Observation ◽  
Tev Gamma Rays

The CALorimetric Electron Telescope (CALET) space experiment, which has been developed by Japan in collaboration with Italy and the United States, is a high-energy astroparticle physics mission on the International Space Station (ISS). The primary goals of the CALET mission include investigation of possible nearby sources of high-energy electrons, detailed study of galactic cosmic-ray acceleration and propagation, and search for dark matter signatures. With a long-term observation onboard the ISS, the CALET experiment measures the flux of cosmic-ray electrons (including positrons) up to 20 TeV, gamma-rays to 10 TeV, and nuclei up to 1,000 TeV based on its charge separation capability from Z = 1 to 40. Since the start of science operation in mid-October, 2015, a continuous observation has been maintained without any major interruptions. The number of triggered events over 10 GeV is nearly 20 million per month. By using the data obtained during the first two-years, here we present a summary of the CALET observations: 1) Electron+positron energy spectrum, 2) Nuclei analysis, 3) Gamma-ray observation with a characterization of the on-orbit performance. The search results for the electromagnetic counterparts of LIGO/Virgo gravitational wave events are also discussed.

Time sequence of TGFs and optical pulses detected by ASIM

2020 ◽  
Author(s):  
Ingrid Bjørge-Engeland ◽  
Nikolai Østgaard ◽  
Chris Alexander Skeie ◽  
Andrey Mezentsev ◽  
Torsten Neubert ◽  
...  
Keyword(s):  
Multispectral Imaging ◽  
Gamma Ray ◽  
Space Station ◽  
High Energy ◽  
Time Sequence ◽  
Relative Timing ◽  
Optical Pulses ◽  
Optical Signals ◽  
Timing Uncertainty ◽  
Using Data

<p>In 2018, the Atmospheric Space Interactions Monitor (ASIM) was launched and mounted onboard the Columbus module of the International Space Station (ISS). Using data from the Modular X- and Gamma-Ray Sensor (MXGS) and the Modular Multispectral Imaging Array (MMIA), we investigate the time sequence of the TGFs detected by MXGS and the optical pulses detected by the MMIA. The optical pulses are observed in the 337 nm and 777.4 nm, and the X- and gamma-rays are detected by the High Energy Detector of MXGS, which is sensitive to energies from 300 keV to more than 30 MeV. We will also look into the TGF duration and any correlation with the time between the TGFs and the main optical signals. The data used is from June 2018 (shortly after mounting on the Columbus module) until the end of March 2019, when the relative timing uncertainty between the two instruments was +/- 80 us. The data after this is presented in Skeie et al.</p>

Assessing the relationship between the TGF durations and the onset times of the TGFs and the main optical pulses as detected by ASIM

2020 ◽  
Author(s):  
Chris Alexander Skeie ◽  
Nikolai Østgaard ◽  
Ingrid Bjørge-Engeland ◽  
Andrey Mezentsev ◽  
Torsten Neubert ◽  
...  
Keyword(s):  
Optical Pulse ◽  
Gamma Ray ◽  
Spectral Imaging ◽  
Time Sequence ◽  
Optical Pulses ◽  
Optical Signals ◽  
Imaging Array ◽  
Common Observation ◽  
Using Data ◽  
The Relationship

<p>Using the Modular X- and Gamma-ray Sensor (MXGS) and the Modular Multi-spectral Imaging Array (MMIA) of the Atmosphere-Space Interactions Monitor (ASIM), we investigate the time sequence of the Terrestrial gamma-ray flashes and the optical emissions from the associated lighting. A common observation in the ASIM data is that the TGFs are observed before or during a weak increase in the optical signals in 337 nm and 777.4 nm, and prior to- or at the onset of the main optical pulse. Using data from the MXGS and MMIA instruments for the period from April 2019, we assess the time sequence and the relationship between the observed TGF duration and the time between the onset of the TGF and the onset of the main optical pulse, with a relative timeing uncertainty of +/- 5 µs. The data prior to April 2019 is presented in Bjørge-Engeland et al.</p>

New highlights of gamma-ray observations by ASIM

2021 ◽  
Author(s):  
Nikolai Ostgaard ◽  
Andrey Mezentsev ◽  
Martino Marisaldi ◽  
Pavlo Kochkin ◽  
Torsten Neubert ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Optical Measurements ◽  
High Flux ◽  
Relative Timing ◽  
Optical Pulses ◽  
Timing Accuracy ◽  
New Science ◽  
Radio Measurements

<p><span>ASIM has now observed several hundreds of TGFs since the launch in 2018. Highlights and new science from the first ten months of observations were presented in Østgaard et al. (2019) paper. In this presentation we will present observational highlights from the last 1.5 year, when the relative timing accuracy between the TGF observations and the optical measurements is +/- 5 us (compared to +/- 80 us before march 2019). This includes many more simultaneous TGF and Elve observations, high flux TGFs, double TGFs simultaneous with double optical pulses and many TGFs with good radio measurements.<span>  </span>ASIM has also observed several Gamma Ray Bursts.<span> </span></span></p>

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>

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