Multi-Point Observation of Hiss Emerging From Lightning Whistlers

0548872 - ÚFA 2022 RIV US eng J - Journal Article
Santolík, Ondřej - Kolmašová, Ivana - Pickett, J. S. - Gurnett, D. A.
Multi-Point Observation of Hiss Emerging From Lightning Whistlers.
Journal of Geophysical Research-Space Physics. Roč. 126, č. 12 (2021), č. článku e2021JA029524. ISSN 2169-9380. E-ISSN 2169-9402
R&D Projects: GA ČR GA20-09671S
EU Projects: European Commission(XE) 870437 - SafeSpace
Institutional support: RVO:68378289
Keywords : plasmaspheric hiss * whistlers * Cluster * WWLLN
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 3.111, year: 2021
Method of publishing: Open access
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2021JA029524

We analyze continuous multi-point measurements of electromagnetic field waveforms onboard the Cluster spacecraft in order to contribute to the discussion on sources of plasmaspheric hiss, known as a shaping agent for the Earth radiation belts. In our case study we aim at finding sources of hiss observed close to the geomagnetic equator in the outer plasmasphere on the dayside. We find hiss to be triggered from whistlers of different spectral properties. Whistlers with the lowest observed dispersion arrive to different spacecraft with time delays indicating their origin in the northern hemisphere. Positions of source lightning discharges are then found using the time coincidences with the Word Wide Lightning Location Network data from three active thunderstorm regions in Europe. We find that subionospheric propagation of lightning atmospherics is necessary to explain the observations. Geographic locations of their ionospheric exit points then determine spectral properties of resulting unducted whistlers and triggered hiss. By this well documented chain of events starting with a lightning discharge in the atmosphere we confirm that magnetospherically reflecting whistlers and hiss triggered from them are among possible sources of plasmaspheric hiss.
Permanent Link: http://hdl.handle.net/11104/0324925