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Related Experiment Video

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A Simple Flight Mill for the Study of Tethered Flight in Insects

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In-Flight Observation of Gamma Ray Glows by ILDAS.

Pavlo Kochkin¹, A P J van Deursen², M Marisaldi¹

¹BCSS University of Bergen Bergen Norway.

Journal of Geophysical Research. Atmospheres : JGR

|March 3, 2018

Summary

A gamma ray emission detected by the In-Flight Lightning Damage Assessment System (ILDAS) over Australia was abruptly stopped by a lightning strike. This event, observed at 12 km altitude, offers new insights into atmospheric phenomena.

Keywords:

ILDAS aircraft gamma ray glow lightning

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Published on: January 30, 2020

Area of Science:

Atmospheric physics
Aerospace engineering
High-energy astrophysics

Background:

Aircraft instrumentation can detect atmospheric phenomena.
Gamma ray emissions have been observed in the atmosphere.
Lightning strikes are powerful atmospheric electrical discharges.

Purpose of the Study:

To analyze a detected long-duration gamma ray emission during a flight over Northern Australia.
To correlate the emission with an in-flight lightning strike.
To reconstruct the aircraft's flight path and the event timeline.

Main Methods:

Utilizing the In-Flight Lightning Damage Assessment System (ILDAS) onboard an Airbus A340.
Reconstructing the aircraft's trajectory and the temporal sequence of events.
Analyzing lightning activity data from ground-based networks.
Estimating the spectral characteristics of the observed emission.

Main Results:

A significant gamma ray emission was detected at 12 km altitude, lasting 20 seconds and 20 times background intensity.
The emission was abruptly terminated by a distant lightning flash.
The terminating flash triggered a discharge from the aircraft wing, recorded on video.
A secondary increase in count rate was observed 6 minutes later, lasting 30 seconds.

Conclusions:

The study provides a detailed analysis of a unique atmospheric event involving gamma ray emission and lightning.
The findings suggest a potential interaction between atmospheric gamma rays and lightning discharges.
Further research is warranted to understand the mechanisms behind these phenomena.