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
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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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
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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