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Radio Physics and Radio Astronomy

Publication de 4  numéros par an

ISSN Imprimer: 2152-274X

ISSN En ligne: 2152-2758

PROPAGATION OF TYPE III SOLAR BURSTS RADIO EMISSION THROUGH THE CORONA. 1. TIME PROFILE

Volume 3, Numéro 3, 2012, pp. 205-213
DOI: 10.1615/RadioPhysicsRadioAstronomy.v3.i3.30
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RÉSUMÉ

The propagation of electromagnetic waves in the coronal plasma, from the area of generation toward an observer, is considered based on the generally accepted plasma theory of type III burst generation. Special attention is given to the increase in the group velocity of the electromagnetic waves, arising from the variation in the plasma density away from the Sun. An analytic formula for the wave's group velocity as function of the generation area coordinate and of separation from that has been derived. The formula is used to analyze the group delay of the waves within two models of the corona. Taking into account the spatial size of the electron beam, it has become possible to obtain representations for the time profile of the electromagnetic radiation. A fine-structured electron beam has been considered. The radiation profile from such a beam can be shown to resemble closely the observed profile of type III bursts with a fine structure. Also, a spherical beam of a monotonically increasing radius is considered, and the dynamic spectrum of type III bursts is derived. The burst duration has been evaluated over a broad frequency range.

CITÉ PAR
  1. Brazhenko A. I., Melnik V. N., Frantsuzenko A. V., Dorovskyy V. V., Rucker H. O., Panchenko M., ON THE HARMONIC COUPLING OF COMPONENTS IN PAIRS OF IIIb–III BURSTS AT DECAMETER WAVELENGTHS, Radio physics and radio astronomy, 20, 2, 2015. Crossref

  2. Melnik V. N., Brazhenko A. I., Frantsuzenko A. V., Dorovskyy V. V., Rucker H. O., Properties of Decameter IIIb–III Pairs, Solar Physics, 293, 2, 2018. Crossref

  3. Dididze G., Shergelashvili B. M., Melnik V. N., Dorovskyy V. V., Brazhenko A. I., Poedts S., Zaqarashvili T. V., Khodachenko M., Comparative analysis of solar radio bursts before and during CME propagation, Astronomy & Astrophysics, 625, 2019. Crossref

  4. Melnik V. N., Brazhenko A. I., Konovalenko A. A., Frantsuzenko A. V., Yerin S. M., Dorovskyy V. V., Bubnov I. M., Properties of Type III and Type IIIb Bursts in the Frequency Band of 8 – 80 MHz During PSP Perihelion at the Beginning of April 2019, Solar Physics, 296, 1, 2021. Crossref

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