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Anisotropic Radio-wave Scattering and the Interpretation of Solar Radio Emission Observations

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F19%3A00523127" target="_blank" >RIV/68378289:_____/19:00523127 - isvavai.cz</a>

  • Result on the web

    <a href="https://www.research.manchester.ac.uk/portal/files/160060006/Kontar_2019_ApJ_884_122.pdf" target="_blank" >https://www.research.manchester.ac.uk/portal/files/160060006/Kontar_2019_ApJ_884_122.pdf</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.3847/1538-4357/ab40bb" target="_blank" >10.3847/1538-4357/ab40bb</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Anisotropic Radio-wave Scattering and the Interpretation of Solar Radio Emission Observations

  • Original language description

    The observed properties (i.e., source size, source position, time duration, and decay time) of solar radio emission produced through plasma processes near the local plasma frequency, and hence the interpretation of solar radio bursts, are strongly influenced by propagation effects in the inhomogeneous turbulent solar corona. In this work, a 3D stochastic description of the propagation process is presented, based on the Fokker-Planck and Langevin equations of radio-wave transport in a medium containing anisotropic electron density fluctuations. Using a numerical treatment based on this model, we investigate the characteristic source sizes and burst decay times for Type III solar radio bursts. Comparison of the simulations with the observations of solar radio bursts shows that predominantly perpendicular density fluctuations in the solar corona are required, with an anisotropy factor of similar to 0.3 for sources observed at around 30 MHz. The simulations also demonstrate that the photons are isotropized near the region of primary emission, but the waves are then focused by large-scale refraction, leading to plasma radio emission directivity that is characterized by a half width at half maximum of about 40 degrees near 30 MHz. The results are applicable to various solar radio bursts produced via plasma emission.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10305 - Fluids and plasma physics (including surface physics)

Result continuities

  • Project

    <a href="/en/project/GJ17-06818Y" target="_blank" >GJ17-06818Y: Heliospheric remote sensing and in situ observations applicable to space weather forecasting</a><br>

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2019

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Astrophysical Journal

  • ISSN

    0004-637X

  • e-ISSN

  • Volume of the periodical

    884

  • Issue of the periodical within the volume

    2

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    15

  • Pages from-to

    122

  • UT code for WoS article

    000501779300002

  • EID of the result in the Scopus database

    2-s2.0-85075150167