Cloud-to-stratosphere lightning discharges: A radio emission model
Article first published online: 7 DEC 2012
Copyright 1992 by the American Geophysical Union.
Geophysical Research Letters
Volume 19, Issue 7, pages 665–668, 3 April 1992
How to Cite
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 15 NOV 1991
- Manuscript Received: 5 JUL 1991
Recent observations of rare cloud-to-stratospheric lightning discharges suggest the events are inherently “slow-rising”, with the emitted energy reaching peak values in about 10 milliseconds. Applying a dipole radiation model, we demonstrate that the emitted radio wave energy from such slow-rising events is strongest below about 50 Hz, and possesses a significant rolloff at higher frequencies. In the analysis, various current distributions are considered in order to determine the effect on the radio spectrum. Near 10 kHz, the emission from cloud-to-stratospheric lightning is significantly reduced as compared to the typical cloud-to-ground return stroke, with amplitudes as much as 50 dB lower. This result may explain the lack of detection of VLF signals from recently observed long-lasting discharge events.