Lorfing, Camille;
Reid, hamish;
(2023)
Solar Electron Beam Velocities that Grow Langmuir Waves in the Inner Heliosphere.
Solar Physics
, 298
, Article 52. 10.1007/s11207-023-02145-2.
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Abstract
Solar accelerated electron beams, a component of space weather, are emitted by eruptive events at the Sun. They interact with the ambient plasma to grow Langmuir waves which subsequently produce radio emission, changing the electrons’ motion through space. Solar electron beam–plasma interactions are simulated using a quasilinear approach to kinetic theory to probe the variations in the maximum electron velocity [Ξ] responsible for Langmuir wave growth between the Sun’s surface and 50 R⊙. We find that it peaks at 5 R⊙ at 0.38 c and decreases as r −0.5 to 0.16 c at 50 R⊙. The role of the initial beam density nbeam and velocity spectral index [α] on the energy density of the beam and Ξ is extensively studied. We show that a high spectral index yields a lower Ξ, while a high nbeam yields a higher Ξ, and vice-versa. We observe at different energy channels that below 60 keV, electrons arrive up to 0.75 minutes earlier than expected at 13 R⊙ while higher energy electrons propagate scatter free in the plasma. A special focus on the associated Type III radio burst shows that the energy range ∆E of electrons producing Langmuir waves evolve from 7 keV to 1 keV between 0 and 28 R⊙. Understanding the transport effect on the electron beam kinetics and arrival time at Earth has space weather implications. The results of this simulation can be tested against readily available in-situ data from Solar Orbiter and Parker Solar Probe
| Type: | Article |
|---|---|
| Title: | Solar Electron Beam Velocities that Grow Langmuir Waves in the Inner Heliosphere |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/s11207-023-02145-2 |
| Publisher version: | https://doi.org/10.1007/s11207-023-02145-2 |
| Language: | English |
| Additional information: | This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
| Keywords: | Electrons, Particle emission, Radio radiation, Langmuir waves, space weather |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10166122 |
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