Sébastien Célestin
YOU?
Author Swipe
View article: Photoelectric Effect in Air Explains Lightning Initiation and Terrestrial Gamma Ray Flashes
Photoelectric Effect in Air Explains Lightning Initiation and Terrestrial Gamma Ray Flashes Open
Terrestrial gamma ray flashes (TGFs) are high‐energy photon bursts that have been linked to short bursts of electromagnetic radiation associated with lightning activity. The most puzzling unexplained aspect of these events is that gamma ra…
View article: Numerical Simulations for Optimizing Small Satellite Constellations for TGF Studies
Numerical Simulations for Optimizing Small Satellite Constellations for TGF Studies Open
The detection of Terrestrial Gamma ray Flashes (TGFs) from space is mostly made by astrophysics satellites, which only provide single‐point measurements. Future TGF missions could consist in performing simultaneous detection by a detector …
View article: Photoelectric Feedback Mechanism for Acceleration of Runaway Electrons in Gas Discharges at High Overvoltages
Photoelectric Feedback Mechanism for Acceleration of Runaway Electrons in Gas Discharges at High Overvoltages Open
Energy conservation dictates that an electron with elementary charge e traversing a vacuum gap formed by electrodes maintained at potential difference U volts acquires maximum energy of eU. In many experiments electrons with energies as hi…
View article: On the Self‐Quenching of Relativistic Runaway Electron Avalanches Producing Terrestrial Gamma Ray Flashes
On the Self‐Quenching of Relativistic Runaway Electron Avalanches Producing Terrestrial Gamma Ray Flashes Open
Terrestrial gamma ray flashes (TGFs) are short bursts of gamma rays occurring during thunderstorms. They are believed to be produced by relativistic runaway electron avalanches (RREAs). It is usually admitted that the number of high‐energy…
View article: Self Consistent Modeling of Relativistic Runaway Electron Beams Giving Rise to Terrestrial Gamma‐Rays Flashes
Self Consistent Modeling of Relativistic Runaway Electron Beams Giving Rise to Terrestrial Gamma‐Rays Flashes Open
Terrestrial Gamma Ray Flashes (TGFs) are short bursts of gamma rays occurring during thunderstorms. They are believed to be produced by Relativistic Runaway Electron Avalanches (RREAs). In this paper, we present a new numerical model based…
View article: Feedback Effects in Positive Corona and Relativistic Runaway Discharges
Feedback Effects in Positive Corona and Relativistic Runaway Discharges Open
We discuss characteristic scales and direct physical analogy between the photoionization feedback in conventional positive corona discharges in air and the photoelectric feedback in discharges driven by relativistic runaway electrons in ai…
View article: XStorm: A New Gamma Ray Spectrometer for Detection of Close Proximity Gamma Ray Glows and TGFs
XStorm: A New Gamma Ray Spectrometer for Detection of Close Proximity Gamma Ray Glows and TGFs Open
In this paper, we present XStorm, a gamma ray spectrometer developed to detect gamma ray glows and terrestrial gamma ray flashes (TGFs) in close proximity. Measurements are mostly planned to take place on balloon campaigns but also on the …
View article: Detailed Modeling and Evaluation of the Potential Impact of Blue Jet on the Atmospheric Chemistry
Detailed Modeling and Evaluation of the Potential Impact of Blue Jet on the Atmospheric Chemistry Open
To evaluate the impact of a blue jet (BJ) discharge on the chemical system in the whole stratosphere as a function of altitude, we developed a detailed ion‐neutral chemistry model. The BJ discharge is formed as a streamer discharge up to 5…
View article: The Impacts of Lightning Beyond the Troposphere
The Impacts of Lightning Beyond the Troposphere Open
International audience
View article: Conditions for Inception of Relativistic Runaway Discharges in Air
Conditions for Inception of Relativistic Runaway Discharges in Air Open
Terrestrial gamma‐ray flashes are linked to growth of long bidirectional lightning leader system consisting of positive and stepping negative leaders. The spatial extent of streamer zones of a typical lightning leader with tip potential ex…
View article: Radiation Risk Assessment Associated With Terrestrial Gamma Ray Flashes for Commercial Flights
Radiation Risk Assessment Associated With Terrestrial Gamma Ray Flashes for Commercial Flights Open
Terrestrial gamma ray flashes (TGFs) are bursts of high‐energy photons produced in thunderstorms. Photons are produced by bremsstrahlung from high‐energy electrons, gaining energy through the electric field in the thunderstorm. Both electr…
View article: High-Frequency Emission from Sprites
High-Frequency Emission from Sprites Open
View article: XStorm: A new instrument to study the terrestrial gamma ray flashes and gamma ray glows on balloon campaigns OREO and Strateole-2.
XStorm: A new instrument to study the terrestrial gamma ray flashes and gamma ray glows on balloon campaigns OREO and Strateole-2. Open
View article: Modeling Self-Consistent Effects in Relativistic Runaway Electron Avalanches
Modeling Self-Consistent Effects in Relativistic Runaway Electron Avalanches Open
View article: Green emissions associated with sprites
Green emissions associated with sprites Open
Upper regions of sprite discharges have recently been found to produce green optical emissions and posted publicly online (Figure 1).They are now commonly referred to as Green Ghosts.There is now a wealth of highquality observations of TLE…
View article: An Overview Of The Stratelec Project (Stratéole-2 Atmospheric Electricity)
An Overview Of The Stratelec Project (Stratéole-2 Atmospheric Electricity) Open
International audience
View article: Modeling Low‐Frequency Radio Emissions From Terrestrial Gamma Ray Flash Sources
Modeling Low‐Frequency Radio Emissions From Terrestrial Gamma Ray Flash Sources Open
Relativistic runaway electron avalanches (RREAs) occur when electrons in electric fields in air reach energies above which they gain more energy from the electric field than they lose to collisions with the surrounding atmosphere. RREAs ar…
View article: Experimental Validation of N2 Emission Ratios in Altitude Profiles of Observed Sprites
Experimental Validation of N2 Emission Ratios in Altitude Profiles of Observed Sprites Open
Recent efforts to compare the sprite ratios with theoretical results have not been successfully resolved due to a lack of theoretical results for sprite streamers in varying altitudes. Advances in the predicted emission ratios of sprite st…
View article: In memoriam: François Lefeuvre
In memoriam: François Lefeuvre Open
It is with great sorrow that we, his friends and colleagues, announce the passing of François Lefeuvre on March 14, 2022.
View article: HF‐VHF Electromagnetic Emissions From Collisions of Sprite Streamers
HF‐VHF Electromagnetic Emissions From Collisions of Sprite Streamers Open
Sprites are complex transient plasma discharges that consist of many plasma filaments named streamers. They are produced high above thunderstorms. Sprites are known to produce electromagnetic radiation observed typically in the extremely l…
View article: Estimation of the electric field and the altitude from spectrophotometric observations in limb-viewing geometry
Estimation of the electric field and the altitude from spectrophotometric observations in limb-viewing geometry Open
International audience
View article: Estimation of Radiation Doses Delivered by Terrestrial Gamma Ray Flashes Within Leader‐Based Production Models
Estimation of Radiation Doses Delivered by Terrestrial Gamma Ray Flashes Within Leader‐Based Production Models Open
With a typical production altitude of ∼12 km, Terrestrial Gamma ray Flash (TGF) sources are close to commercial flight altitudes, and these events could potentially be an unforeseen exposure to ionizing radiation for aircraft passengers an…
View article: Estimation of the electric field and the altitude from  spectrophotometric observations in limb-viewing geometry
Estimation of the electric field and the altitude from  spectrophotometric observations in limb-viewing geometry Open
<p>Sprites are bright and sudden events occuring above thunderstorms between 40 and 90 km altitude. These phenomena are usually observed using ground-based cameras and from spacecrafts. The Imager of Sprites and Upper Atmospheric Lig…
View article: Currents
Currents Open
Simulation output used to calculate radio emissions for the paper "Modeling Low-Frequency Radio Emissions from Terrestrial Gamma Ray Flash Sources"
View article: Geomagnetic Deviation of Relativistic Electron Beams Producing Terrestrial Gamma Ray Flashes
Geomagnetic Deviation of Relativistic Electron Beams Producing Terrestrial Gamma Ray Flashes Open
In this work, we investigate the effect of the geomagnetic field on terrestrial gamma ray flashes (TGFs). Although this effect should be relatively weak for a single event, for example compared to the effect of the electric field orientati…
View article: A New Detailed Plasma‐Chemistry Model for the Potential Impact of Blue Jet Streamers on Atmospheric Chemistry
A New Detailed Plasma‐Chemistry Model for the Potential Impact of Blue Jet Streamers on Atmospheric Chemistry Open
A detailed ion‐neutral chemistry model named MiPO‐Streamer model has been developed to simulate the impact of blue jet streamers on stratospheric chemistry. It is based on the MiPLaSMO model (Microphysical and Photochemical Lagrangian Stra…
View article: Fig5_pvalue_614TGF_subset
Fig5_pvalue_614TGF_subset Open
Results shown in Figure 5 for the 614-TGF-subset
View article: Untitled Item
Untitled Item Open
Results shown in Figure 5 for all 1341 TGFs
View article: Fig5_pvalue_all1341TGF
Fig5_pvalue_all1341TGF Open
Results shown in Figure 5 for all 1341 TGFs
View article: Analysis of Individual Terrestrial Gamma‐Ray Flashes With Lightning Leader Models and Fermi Gamma‐Ray Burst Monitor Data
Analysis of Individual Terrestrial Gamma‐Ray Flashes With Lightning Leader Models and Fermi Gamma‐Ray Burst Monitor Data Open
The Gamma‐ray Burst Monitor (GBM) onboard the Fermi spacecraft has observed many tens of sufficiently bright events, which are suitable for individual analysis. In our previous study, we fit individual, bright terrestrial gamma‐ray flashes…