The effect of the kinetic temperature of plasma electrons on the dispersion measure and rotation

Рубрика: 
Extragalactic Astronomy
Ulyanov, O, Tiburzi, C, Shevtsova, A, Zakharenko, V, Konovalenko, A, Zarka, P, Grieẞmeier, J-M, Skoryk, M, Skoryk, A, Yerin, S, Kravtsov, I, Brazhenko, A, Frantsuzenko, A, Bubnov, I
Kinemat. fiz. nebesnyh tel (Online) 2025, 41(4):31-43
https://doi.org/10.15407/kfnt2025.04.031
Язык: Ukrainian
Аннотация: 

The aim of this work is to analyze the impact of the kinetic temperature of electrons in a hot anisotropic plasma and the intensity of its magnetic field on the integral characteristics of pulsar radio emission, such as the dispersion measure and the rotation measure. An important aspect for this is the presence of magnetic fields in the plasma and their strength, as well as their configuration relative to the line of sight. The peculiarity of our approach is to take into account the polarization splitting into ordinary and extraordinary waves in the pulsed radio emission of pulsars, as well as to consider the extreme cases of quasi-longitudinal and quasi-transverse propagation of these waves in a medium with magnetic fields of different intensities in the presence or absence of scattering. This allows us to predict the dependence of the dispersion measure and the rotation measure on the frequency (which was not foreseen before), the magnetic field value, and the kinetic temperature of electrons, as well as the grows of this dependence with increasing magnetic field. It is important to note that the dependence of the dispersion measure and the rotation measure on frequency is more evident at low frequencies than at high frequencies, and the dispersion measure and the absolute value of the rotation measure increase with decreasing frequency. Taking into account the established dependencies in the studies of the dispersion and rotation measures in the directions to different pulsars makes it possible to estimate the parameters of the cosmic magnetically active plasma, in particular, to determine the range of kinetic electron temperatures and the intensity of the longitudinal and transverse magnetic field components on the path of polarized radiation propagation. Thus, using pulsar pulses as probing radio signals, a new opportunity to study hot magnetically active plasma with magnetic field strengths of the order of 1...10 G or higher, which primarily includes the Sun’s corona, the Jupiter-Io magnetic tube, and the Earth’s ionosphere, appears.
Ключевые слова: cosmic plasma, dispersion measure, interstellar medium, magnetic fields, propagation effects, pulsars, radio pulses, rotation measure

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