Optical measurements of precipitating relativistic electron microbursts during geomagnetic disturbance and pulsating aurora

Klimov, P.; Nikolaeva, V.; Shchelkanov, K.; Saraev, R.; Sigaeva, K.; Kotikov, A.; Belov, A.A.; Kozelov, B.; Murashov, A.; Roldugin, A.

Авторы: Klimov Pavel, Nikolaeva Vera, Shchelkanov Konstantin, Saraev Roman, Sigaeva Ksenia, Kotikov Andrei, Belov Alexander A., Kozelov Boris, Murashov Alexei, Roldugin Alexei
Журнал: Advances in Space Research
Том: 75
Номер: 3
Год издания: 2025
Издательство: Pergamon Press Ltd.
Местоположение издательства: United Kingdom
Первая страница: 3210
Последняя страница: 3219
DOI: 10.1016/j.asr.2024.11.035
Аннотация: Mechanisms of formation and losses of radiation belts are the most important questions of magnetospheric physics, especially in a subsecond temporal scale. Energetic particles release their energy in the atmosphere producing fluorescent emission in characteristic wavelength bands. This emission is measurable and can be an additional information source on the spatiotemporal structure of particle fluxes and spectra. Here we present the world’s first measurements of UV-microbursts during geomagnetic disturbance and pulsating aurora caused by high-energy electron precipitation. It demonstrates that fundamental questions of magnetospheric physics mentioned above can be addressed by using the optical measurements by highly sensitive photometers with high temporal resolution. Such a photometer was installed at Verkhnetulomsky observatory at Kola Peninsula and measured a series of short (less than 0.5 s) pulses of emission with an angular size of bright spot ∼0.2 rad. Simultaneous measurements of high-energy electron fluxes made by the NOAA-19 satellite and fine temporal structure of geomagnetic pulsations demonstrate a magnetospheric origin of the observed events.
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