Skip to main content
SpringerLink
Log in

Influence of the Angular Distribution of Langmuir Waves on the Directivity of Radio Emission at Double Plasma Frequency

  • Published:
Geomagnetism and Aeronomy Aims and scope Submit manuscript

Abstract

The directivity of transverse electromagnetic waves generated in a plasma at a double plasma frequency during the coalescence of plasma waves is calculated for various angular distributions of these waves. It is shown that the directivity of the generated electromagnetic waves is determined by the angular distribution of the spectral energy density of the Langmuir waves and is practically independent of the turbulence spectrum. The case of axial symmetry of emitting area is considered. If the angular distribution of Langmuir waves is proportional to cosδ ϑ, where ϑ is the angle between the direction of the wave vector of the Langmuir wave and the axis of the symmetry of the emitting region, the maximum of the generated transverse waves corresponds to viewing angles of α = 30°–45°, where the viewing angle is the angle between the line of sight and the axis of the emitting-area symmetry. In this case, the ratio of the maximum intensity of the generated radiation to the minimum can reach 3. If the angular distribution of turbulence is proportional to sinδ ϑ, then the radio-emission maximum corresponds to viewing angles of α = 60°–120°. This anisotropy of the solar plasma radiation can be measured with radio observations, which will make it possible to draw a conclusion about the nature and source of Langmuir turbulence in the solar plasma.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1.
Fig. 2.

Similar content being viewed by others

REFERENCES

  1. Aschwanden, M., Particle acceleration and kinematics in solar flares: A synthesis of recent observations and theoretical concepts (invited review), Space Sci. Rev., 2002, vol. 101, nos. 1–2, pp. 1–227.

    Article  Google Scholar 

  2. Dmitriev, P.B., Kudryavtsev, I.V., Lazutkov, V.P., Matveev, G.A., Savchenko, M.I., Skorodumov, D.V., and Charikov, Yu.E., Solar flares registered by the IRIS spectrometer onboard the CORONAS-F satellite: Peculiarities of the X-ray emission, Sol. Syst. Res., 2006, vol. 40, no. 2, pp. 142–152.

    Article  Google Scholar 

  3. Fleishman, G.D., Loukitcheva, M.A., Kopnina, V.Yu., Nita, G.M., and Gary, D.E., The coronal volume of energetic particles in solar flares as revealed by microwave imaging, Astrophys. J., 2018, vol. 867, no. 1, id 81.

  4. Kontar, E.P. and Nindos, A., Combined radio and space-based solar observations: From techniques to new results—preface, Sol. Phys., 2018, vol. 293, no. 6, id 90.

  5. Kudryavtsev, I.V., Dynamics of Langmuir turbulence at plasmoid scattering on background plasma particles, in Sb. trudov XX Vseross. ezhegod. konf. “Solnechnaya i solnechno–zemnaya fizika 2016” (Proceedings of the XX All-Russian Annual Conference "Solar and Solar–Terrestrial Physics 2016”), St. Petersburg, 2016, pp. 175–178.

  6. Kudryavtsev, I.V. and Kaltman, T.I., Peculiarities of the simulation of solar radio emission on double plasma frequency within the plasma mechanism when fast electrons are injected into the flare loop, Sb. trudov XX Vseross. ezhegod. konf. “Solnechnaya i solnechno–zemnaya fizika 2018” (Proceedings of the XXII All-Russian Annual Conference “Solar and Solar–Terrestrial Physics 2018”), St. Petersburg, 2018, pp. 255–258.

  7. Ratcliffe, H., Kontar, E.P., and Reid, H.A.S., Large-scale simulations of solar type III radio bursts: Flux density, drift rate, duration, and bandwidth, Astron. Astrophys., 2014, vol. 572, id A111.

  8. Reid, H.A.S. and Ratcliffe, H., A review of solar type III radio burst, Res. Astron. Astrophys., 2014, vol. 14, no. 7, pp. 773–804.

    Article  Google Scholar 

  9. Takasao, S., Asai, A., Isobe, H., and Shibata, K., Observational evidence of particle acceleration associated with plasmoid motions, Astrophys. J., 2014, vol. 828, id 103.

  10. Tsytovich, V.N., Teoriya turbulentnoi plazmy (Theory of Turbulent Plasma), Moscow: Atomizdat, 1971.

  11. Zheleznyakov, V.V. and Zaitsev, V.V., The theory of type III solar radio bursts, Astron. Zh., 1970, vol. 47, no. 1, pp. 60–75.

    Google Scholar 

Download references

Funding

This study was supported by the Russian Foundation for Basic Research, project no. 18-29-21 016.

Author information

Authors and Affiliations

  1. Ioffe Institute, St. Petersburg, Russia

    I. V. Kudryavtsev

  2. Central Astronomical Observatory, Russian Academy of Sciences, St. Petersburg, Russia

    I. V. Kudryavtsev

  3. St. Petersburg Branch, Special Astrophysical Observatory, Russian Academy of Sciences, St. Petersburg, Russia

    T. I. Kaltman

Authors
  1. I. V. Kudryavtsev
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. T. I. Kaltman
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to I. V. Kudryavtsev.

Ethics declarations

The authors declare no conflict of interest.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Kudryavtsev, I.V., Kaltman, T.I. Influence of the Angular Distribution of Langmuir Waves on the Directivity of Radio Emission at Double Plasma Frequency. Geomagn. Aeron. 60, 1122–1125 (2020). https://doi.org/10.1134/S0016793220080137

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1134/S0016793220080137

Search

Navigation