ORIGINAL RESEARCH article
Front. Astron. Space Sci.
Sec. Space Physics
Determination of the CME core parameters by the spectral characteristics of the fine structure of the associated type IV burst
Provisionally accepted
- Institute of Radio Astronomy, National Academy of Sciences of Ukraine, Kharkiv, Ukraine
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The analysis of the Type IV burst and spikes, which were observed on its background, registered on 22 August 2015 in the meter-decameter wavelength range is presented. For the first time spikes as a fine structure of the Type IV burst were used to determine the temperature (T) and magnetic field (B) of the CME core. Supposing plasma emission mechanism the density distribution n(r) within the CME core and as a consequence temperature T(r) and magnetic field B(r) distributions, where r is the distance from the core center, were obtained. The established density, temperature, magnetic field within the CME core varied from nc ≈6.6 × 107 cm−3 to np ≈3.2 × 106 cm−3, Tc ≈1.4 MK to Tp ≈0.3 MK, Bc ≈0.56 −4.4 G to Bp ≈6 × 10−2 −1 G correspondingly (subscripts c and p denote center and periphery of the core). The estimated mass of the CME was about 1015 −1016 g.
Keywords: Coronal mass ejections (CMEs), magnetic field, Meter-Decameter Radio Bursts, spikes, temperature, Type IV burst
Received: 25 Dec 2025; Accepted: 12 Feb 2026.
Copyright: © 2026 Shevchuk, Melnik, Dorovskyy, Konovalenko, Bubnov and Yerin. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Mykola Shevchuk
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