Whistler influence on the overall VLF wave intensity in the upper ionosphere

Abstract : We investigate the influence of lightning‐generated whistlers on the overall intensity of electromagnetic waves measured by the Detection of Electro‐Magnetic Emissions Transmitted from Earthquake Regions spacecraft (2004–2010, quasi Sun‐synchronous polar orbit with an altitude of about 700 km) at frequencies below 18 kHz. Whistler occurrence rate evaluated using an onboard neural network designed for automated whistler detection is used to distinguish periods of high and low whistler occurrence rates. It is shown that especially during the night and particularly in the frequency‐geomagnetic latitude intervals with a low average wave intensity, contribution of lightning‐generated whistlers to the overall wave intensity is significant. At frequencies below 1 kHz, where all six electromagnetic wave components were measured during specific intervals, the study is accompanied by analysis of wave propagation directions. When we limit the analysis only to fractional‐hop whistlers, which propagate away from the Earth, we find a reasonable agreement with results obtained from the whole data set. This also confirms the validity of the whistler occurrence rate analysis at higher frequencies.
Complete list of metadatas

Cited literature [58 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-01823598
Contributor : Nathalie Rouchon <>
Submitted on : Thursday, January 3, 2019 - 2:45:12 PM
Last modification on : Wednesday, September 4, 2019 - 2:22:04 PM
Long-term archiving on : Thursday, April 4, 2019 - 3:10:18 PM

File

Z-hlava_et_al-2018-Journal_of_...
Publisher files allowed on an open archive

Identifiers

Collections

Citation

J. Záhlava, F. Němec, Jean -Louis Pincon, O. Santolík, I. Kolmašová, et al.. Whistler influence on the overall VLF wave intensity in the upper ionosphere. Journal of Geophysical Research Space Physics, American Geophysical Union/Wiley, 2018, 123 (7), pp.5648-5660. ⟨10.1029/2017JA025137⟩. ⟨insu-01823598⟩

Share

Metrics

Record views

62

Files downloads

100