F. Christiansen
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View article: The difference between multiple TGFs and FGFs
The difference between multiple TGFs and FGFs Open
Atmosphere Space Interaction Monitor (ASIM) has been in operation since 2018 to observe Terrestrial Gamma-ray flashes (TGFs) and optical signals from lightning. ASIM has two payloads, the Modular X- and Gamma-ray Sensor (MXGS) and the Modu…
View article: X-ray and gamma-ray timing of GRB 180720B, GRB 181222B, GRB 211211A, and GRB 220910A observed with <i>Fermi</i> and ASIM
X-ray and gamma-ray timing of GRB 180720B, GRB 181222B, GRB 211211A, and GRB 220910A observed with <i>Fermi</i> and ASIM Open
We present a timing study of the gamma and X-ray observations and analysis of a sample of bright gamma-ray bursts (GRBs; i.e. GRB 180720B, GRB 181222B, GRB 211211A, and GRB 220910A), including the very bright and long GRB 211211A (a.k.a. k…
View article: X-ray and gamma-ray timing of GRB 180720B, GRB 181222B, GRB 211211A and GRB 220910A observed with Fermi and ASIM
X-ray and gamma-ray timing of GRB 180720B, GRB 181222B, GRB 211211A and GRB 220910A observed with Fermi and ASIM Open
We present a timing study of the gamma and X-ray observations and analysis of a sample of bright gamma-ray bursts (GRBs; i.e. GRB 180720B, GRB 181222B, GRB 211211A and GRB 220910A), including the very bright and long GRB 211211A (a.k.a. ki…
View article: TGFs - "Storm Activity" relationship
TGFs - "Storm Activity" relationship Open
In the first two years of ASIM operations from June 2018 till the end of 2019 486 TGFs have been observed, with a TGF rate of 0.84 per day. Their geographical distribution is consistent with the three main lightning chimneys Central Americ…
View article: Multiwavelength study of the luminous GRB 210619B observed with <i>Fermi</i> and ASIM
Multiwavelength study of the luminous GRB 210619B observed with <i>Fermi</i> and ASIM Open
We report on detailed multiwavelength observations and analysis of the very bright and long GRB 210619B, detected by the Atmosphere-Space Interactions Monitor installed on the International Space Station and the Gamma-ray Burst Monitor (GB…
View article: Terrestrial Gamma‐Ray Flashes With Accompanying Elves Detected by ASIM
Terrestrial Gamma‐Ray Flashes With Accompanying Elves Detected by ASIM Open
The Atmosphere‐Space Interactions Monitor was designed to monitor Terrestrial Gamma‐ray Flashes (TGFs) and Transient Luminous Events (TLEs) from space, enabling the study of how these phenomena are related. In this paper, we present observ…
View article: Observations by ASIM of Terrestrial Gamma-ray Flashes accompanied by Elves
Observations by ASIM of Terrestrial Gamma-ray Flashes accompanied by Elves Open
<p>Terrestrial gamma-ray flashes (TGFs) are short and highly energetic bursts of photons, produced in association with lightning in thunderstorms. Elves are rapidly expanding rings of optical emissions, with radii of several hundred …
View article: Brother TGF
Brother TGF Open
<p>ASIM TGF catalog presents more than one thousand TGF from June 2018 till the end of 2021. Using this dataset, the detection rate of TGF by ASIM was about one TGF per day. The TGF detection is a stochastic process (each TGF is not …
View article: Double TGFs and optical pulses observed by ASIM&#160;
Double TGFs and optical pulses observed by ASIM  Open
<p><span>Atmosphere Space Interaction Monitor (ASIM) has now observed more than 1000 Terrestrila Gamma-ray falshes (TGFs) since the launch in 2018. ASIM has two payloads, the Modular X- and Gamma-ray Sensor (MXGS) and the Modul…
View article: Investigating the fluence of bright TGF events detected by the Atmosphere-Space Interactions Monitor
Investigating the fluence of bright TGF events detected by the Atmosphere-Space Interactions Monitor Open
<p>Terrestrial Gamma-ray Flashes (TGFs) are short flashes of high-energy photons produced by thunderstorms. They are intense phenomena that may have high photon fluxes with energies up to 40 MeV when observed from detectors in orbit.…
View article: Constraining Spectral Models of a Terrestrial Gamma‐Ray Flash From a Terrestrial Electron Beam Observation by the Atmosphere‐Space Interactions Monitor
Constraining Spectral Models of a Terrestrial Gamma‐Ray Flash From a Terrestrial Electron Beam Observation by the Atmosphere‐Space Interactions Monitor Open
Terrestrial Gamma ray Flashes (TGFs) are short flashes of high energy photons, produced by thunderstorms. When interacting with the atmosphere, they produce relativistic electrons and positrons, and a part gets bounded to geomagnetic field…
View article: Simultaneous Observations of EIP, TGF, Elve, and Optical Lightning
Simultaneous Observations of EIP, TGF, Elve, and Optical Lightning Open
On February 8, 2019, the Atmosphere‐Space Interaction Monitor observed a terrestrial gamma‐ray flash (TGF) and an Elve from a positive intracloud (+IC) lightning during the initial breakdown stage of a lightning flash north east of Puerto …
View article: Constraining spectral models of a terrestrial gamma-ray flash from a terrestrial electron beam observation by the Atmosphere-Space Interactions Monitor
Constraining spectral models of a terrestrial gamma-ray flash from a terrestrial electron beam observation by the Atmosphere-Space Interactions Monitor Open
<p>Terrestrial Gamma-ray Flashes (TGFs) are short flashes of high energy photons, produced by thunderstorms. When interacting with the atmosphere, they produce relativistic electrons and positrons, and a part gets bounded to geomagne…
View article: New highlights of gamma-ray observations by ASIM
New highlights of gamma-ray observations by ASIM Open
<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 &#216;stgaard et al. (2019) paper. In this presentatio…
View article: Spectral Analysis of Individual Terrestrial Gamma-ray Flashes Detected by ASIM
Spectral Analysis of Individual Terrestrial Gamma-ray Flashes Detected by ASIM Open
<p>Terrestrial Gamma-ray Flashes (TGFs) are sub-millisecond bursts of high-energy photons associated with lightning flashes in thunderstorms. The Atmosphere-Space Interactions Monitor (ASIM), launched in April 2018, is the first spac…
View article: Extreme TGF Imaging by ASIM
Extreme TGF Imaging by ASIM Open
<p>One year after the starting of ASIM operational phase, we have succeeded to perform accurate Imaging of 54 TGF.&#160; Among them, some have been analysed at extreme imaging conditions in terms of TGF position at the MXGS parti…
View article: Lightning optical context associated with ASIM TGFs
Lightning optical context associated with ASIM TGFs Open
<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 detecto…
View article: ASIM - Fermi - AGILE simultaneous observation of Terrestrial Gamma-ray Flashes
ASIM - Fermi - AGILE simultaneous observation of Terrestrial Gamma-ray Flashes Open
<p>The Atmosphere Space Interaction Monitor (ASIM) mission onboard the International Space Station is the first mission specifically dedicated to the observation of Terrestrial Gamma-ray Flashes (TGF) and Transient Luminous Events (T…
View article: Observation of TGFs at High Latitude
Observation of TGFs at High Latitude Open
<p><span>Terrestrial Gamma-ray Flashes (TGFs) are short bursts of gamma radiation originating from thunderclouds; </span><span>they propagate upwards and</span> <span>are then detected by satellites such…
View article: Assessing the relationship between the TGF durations and the onset times of the TGFs and the main optical pulses as detected by ASIM
Assessing the relationship between the TGF durations and the onset times of the TGFs and the main optical pulses as detected by ASIM Open
<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 th…
View article: First 10 Months of TGF Observations by ASIM
First 10 Months of TGF Observations by ASIM Open
The Atmosphere‐Space Interactions Monitor (ASIM) was launched to the International Space Station on 2 April 2018. The ASIM payload consists of two main instruments, the Modular X‐ray and Gamma‐ray Sensor (MXGS) for imaging and spectral ana…
View article: The First Terrestrial Electron Beam Observed by the Atmosphere‐Space Interactions Monitor
The First Terrestrial Electron Beam Observed by the Atmosphere‐Space Interactions Monitor Open
We report the first Terrestrial Electron Beam detected by the Atmosphere‐Space Interactions Monitor. It happened on 16 September 2018. The Atmosphere‐Space Interactions Monitor Modular X and Gamma ray Sensor recorded a 2 ms long event, wit…
View article: POGO satellite orbit corrections: an opportunity to improve the quality of the geomagnetic field measurements?
POGO satellite orbit corrections: an opportunity to improve the quality of the geomagnetic field measurements? Open
We present an attempt to improve the quality of the geomagnetic field measurements from the Polar Orbiting Geophysical Observatory (POGO) satellite missions in the late 1960s. Inaccurate satellite positions are believed to be a major sourc…