Pitch-Angle Diffusion of Energetic Protons upon Their Interaction with EMIC Waves: Comparison of Calculation Results with THEMIS and NOAA/POES Data

Авторы: Popova Tatyana, Lyubchich Andris, Demekhov Andrei, Yahnin Alexander
Сборник: Springer Proceedings in Earth and Environmental Sciences
Серия: Baltic Region—The Region of Cooperation
Год издания: 2020
Место издания: Springer Nature Switzerland AG Cham, Switzerland
Первая страница: 309
Последняя страница: 318
DOI: 10.1007/978-3-030-21788-4_27
Аннотация: We analyze several cases of THEMIS spacecraft observations of EMIC waves in proton andHe+ frequency bands in various local time sectors and L shells. We selected the events during which the energetic proton precipitation was observed by low-orbiting POES spacecraft in the conjugate region. By using the data on the spectral intensity of EMIC waves, the geomagnetic field, and the plasma density we calculated the pitch-angle diffusion coefficients of energetic protons for various energies at low pitch-angles. The calculations were performed under the assumption that the ambient plasma consisted of three ion species, i.e., protons,He+, andO+ions. The results of calculations were compared with the energy of precipitated protons. On the whole, the energies of precipitated energetic protons are in agreement with those which can be expected on the basis of the calculated pitch-angle diffusion coefficients.
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