MHD WAVES IN THE COLLISIONAL PLASMA OF THE SOLAR CORONA AND TERRESTRIAL IONOSPHERE-Reference-Cited by-同舟云学术

MHD WAVES IN THE COLLISIONAL PLASMA OF THE SOLAR CORONA AND TERRESTRIAL IONOSPHERE

Published:2020-12-22 Issue:4 Volume:6 Page:18-25
ISSN:2712-9640
Container-title:Solnechno-Zemnaya Fizika
language:en
Short-container-title:

Author:

Nekrasov Anatoliy¹,Pilipenko Vyacheslav²³

Affiliation:

1. Institute of Physics of the Earth RAS

2. Space Research Institute

3. Schmidt Institute of Physics of the Earth, RAS

Abstract

We have studied MHD waves (Alfvén and fast compressional modes) in a homogeneous collisional three-component low-β plasma. The three-component plasma consists of electrons, ions, and neutrals with arbitrary ratio between collision frequencies and wave time scales. We have derived a general dispersion equation and relationships for phase velocity and collisional damping rates for MHD modes for various limiting cases: from weak collisions to a strong collisional coupling, and for longitudinal and oblique propagation. In a weak collision limit, the MHD eigen-modes are reduced to ordinary low-damping Alfvén and fast magnetosonic waves. For a partially ionized plasma with a strong collisional coupling of neutrals and ions, velocities of magnetosonic and Alfvén waves are substantially reduced, as compared to the Alfvén velocity in the ideal MHD theory. At a very low frequency, when neutrals and ions are strongly coupled, a possibility arises of weakly damping MHD modes, called “decelerated” MHD modes. These modes can be observed in the solar corona/chromosphere and in the F layer of the terrestrial ionosphere.

Publisher

Infra-M Academic Publishing House

Reference27 articles.

1. Ballester J.L., Alexeev I.I., Collados M., et al. Partially ionized plasmas in astrophysics // Space Sci. Rev. 2018. V. 214, iss. 2. Article id. 58. DOI: 10.1007/s11214-018-0485-6., Ballester J.L., Alexeev I.I., Collados M., Downes T., Pfaff R.F., Gilbert H., et al. Partially ionized plasmas in astrophysics. Space Sci. Rev. 2018, vol. 214, iss. 2, article id. 58. DOI: 10.1007/s11214-018-0485-6.

2. Balthasar H., Wiehr E., Schleicher H., Wohl H. Doppler oscillations in solar prominences simultaneously observed with two telescopes: Discovery of a 30 s oscillation // Astron. Astrophys. 1993. V. 277. P. 635–638., Balthasar H., Wiehr E., Schleicher H., Wohl H. Doppler oscillations in solar prominences simultaneously observed with two telescopes: Discovery of a 30 s oscillation. Astron. Astrophys. 1993, vol. 277, pp. 635–638.

3. Barkhatov N.A., Barkhatova O.M., Grigor’ev G.I. Spectral characteristics of magnetogravity waves generated by high-energy mass source in the equatorial region of the atmosphere. Part I // Geomagnetism and Aeronomy. 2014. V. 54, N 6. P. 819–831., Barkhatov N.A., Barkhatova O.M., Grigor’ev G.I. Spectral characteristics of magnetogravity waves generated by high-energy mass source in the equatorial region of the atmosphere. Part I. Geomagnetism and Aeronomy. 2014, vol. 54, no. 6, pp. 819–831.

4. Barkhatova O.M., Barkhatov N.A., Grigoriev G.I. Discovery of magnetogravitational waves in the ionosphere using maximal observed frequencies at oblique radio sounding paths // Izv. Vuzov. Radiophysics. 2009. V. 52, N 10. P. 761–778., Barhatova O.M., Barhatov N.A., Grigoriev G.I. Discovery of magnetogravitational waves in the ionosphere using maximal observed frequencies at oblique radio sounding paths. Izv. Vuzov. Radiophysics. 2009, vol. 52, no. 10, pp. 761–778.

5. Cally P.S. Alfv´en reﬂection and reverberation in the solar atmosphere // Solar Phys. 2012. V. 280. P. 33–50. DOI: 10.1007/s11207-012-0052-3., Cally P.S. Alfvén reﬂection and reverberation in the solar atmosphere. Solar Phys. 2012, vol. 280, pp. 33–50. DOI: 10.1007/s11207-012-0052-3.